Reduced power and Reduced turbo boost

[Jay Darst]

Just returned from a 876 mile round trip to Elkhart Lake, WI.

Noticed the fuel vacuum gage in the red. So changed Racor fuel
before heading back home. Still the gage read in the RED. So, 1/3 of
the way home, changed the spin on fuel filter. Still the gage read
in the RED.

The gage seems to have always worked before.

Before and after changing the Racor filter and subsequently the spin
on fuel filer, my boost gage would see 20psi.

Later, when almost home(and dead dog tired) seemed that power was
less than normal and boost would only see 15psi.

The last tank of fuel was treated with Lucas fuel treatment, 1
gallon Lucas to 300 gallons of fuel.

Any suggestions as to why the loss of power and boost with fresh
filters?

Thanks
Jay Darst
85PT40 6V92 Detroit
Springfield, IL

[John Suter]

Jay,

I do not want to be an alarmist, however check the
castings and flanges which deliver the boost air to
the engine (I think to the aftercooler) for cracks
that permit pressure leaks. Just before FMCA I saw
coach with symptoms that you describe, which delivered
leaking hot exhaust air into combustible areas of the
engine compartment. The cracked areas, once
discovered, were barely visable behind the large fan
but careful inspection permitted first a fingernail,
then a knife blade to be inserted into the gaps.

John Suter



--- Jay Darst wrote:
> Just returned from a 876 mile round trip to Elkhart
> Lake, WI.
>
> Noticed the fuel vacuum gage in the red. So changed
> Racor fuel
> before heading back home. Still the gage read in the
> RED. So, 1/3 of
> the way home, changed the spin on fuel filter. Still
> the gage read
> in the RED.
>
> The gage seems to have always worked before.
>
> Before and after changing the Racor filter and
> subsequently the spin
> on fuel filer, my boost gage would see 20psi.
>
> Later, when almost home(and dead dog tired) seemed
> that power was
> less than normal and boost would only see 15psi.
>
> The last tank of fuel was treated with Lucas fuel
> treatment, 1
> gallon Lucas to 300 gallons of fuel.
>
> Any suggestions as to why the loss of power and
> boost with fresh
> filters?
>
> Thanks
> Jay Darst
> 85PT40 6V92 Detroit
> Springfield, IL
>
>
>
>

__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com

[Jay Darst]

The "FUEL VACUUM" gage is now reading very high into the red, which
would indicate that the fuel pump is really having to work(suck)to
pull fuel through the Racor.

I would use air pressure to relieve any blockage in the fuel line
that connects the fuel tank to the Racor, but then how would the
line be refilled so as to avoid air in the line?

With the "FUEL VACUUM" gage reading an unusually high vacuum, I am
fairly certain that this is a fuel delivery problem.

So far, attempted repairs in chronological order:
1.)replace Racor fuel filter
2.)replace Spin-On fuel filter
3.)Again, remove and inspect Racor filter, empty contents of Racor
filter, remove bottom half of Racor filter for inspection and
cleaning.

It appears that the FUEL VACUUM gage is plumbed directly aftter the
RACOR filter, which would place it between the RACOR and the SPIN-ON
fuel filter. That being the case, it would seem that by removing the
contents of the RACOR, the FUEL VACUUM gage would read 0 since there
could would no longer be resistance, hence the RACOR filter canistor
is now empty.

Replaced Racor filter, refilled with fuel and started engine. Runs a
bit un-even. Pretty sure its starving for fuel.

HELP?!

Thanks
Jay Darst
85PT40 6V92
SpringfieldIL
--- In WanderlodgeForum@yahoogroups.com, John Suter
wrote:
> Jay,
>
> I do not want to be an alarmist, however check the
> castings and flanges which deliver the boost air to
> the engine (I think to the aftercooler) for cracks
> that permit pressure leaks. Just before FMCA I saw
> coach with symptoms that you describe, which delivered
> leaking hot exhaust air into combustible areas of the
> engine compartment. The cracked areas, once
> discovered, were barely visable behind the large fan
> but careful inspection permitted first a fingernail,
> then a knife blade to be inserted into the gaps.
>
> John Suter
>
>
>
> --- Jay Darst wrote:
> > Just returned from a 876 mile round trip to Elkhart
> > Lake, WI.
> >
> > Noticed the fuel vacuum gage in the red. So changed
> > Racor fuel
> > before heading back home. Still the gage read in the
> > RED. So, 1/3 of
> > the way home, changed the spin on fuel filter. Still
> > the gage read
> > in the RED.
> >
> > The gage seems to have always worked before.
> >
> > Before and after changing the Racor filter and
> > subsequently the spin
> > on fuel filer, my boost gage would see 20psi.
> >
> > Later, when almost home(and dead dog tired) seemed
> > that power was
> > less than normal and boost would only see 15psi.
> >
> > The last tank of fuel was treated with Lucas fuel
> > treatment, 1
> > gallon Lucas to 300 gallons of fuel.
> >
> > Any suggestions as to why the loss of power and
> > boost with fresh
> > filters?
> >
> > Thanks
> > Jay Darst
> > 85PT40 6V92 Detroit
> > Springfield, IL
> >
> >
> >
> >
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com

[Mike Hohnstein]

Some times them hoses delaminate, it's not good when that happens. I had
problems that I suspected were due to old flexible line. I replaced it all,
stuff wears out.
Mike Hohnstein
Germantown, WI
83FC35
----- Original Message -----
From: Jay Darst
To: WanderlodgeForum@yahoogroups.com
Sent: Monday, May 02, 2005 9:16 PM
Subject: [WanderlodgeForum] Re: Reduced power and Reduced turbo boost


The "FUEL VACUUM" gage is now reading very high into the red, which
would indicate that the fuel pump is really having to work(suck)to
pull fuel through the Racor.

I would use air pressure to relieve any blockage in the fuel line
that connects the fuel tank to the Racor, but then how would the
line be refilled so as to avoid air in the line?

With the "FUEL VACUUM" gage reading an unusually high vacuum, I am
fairly certain that this is a fuel delivery problem.

So far, attempted repairs in chronological order:
1.)replace Racor fuel filter
2.)replace Spin-On fuel filter
3.)Again, remove and inspect Racor filter, empty contents of Racor
filter, remove bottom half of Racor filter for inspection and
cleaning.

It appears that the FUEL VACUUM gage is plumbed directly aftter the
RACOR filter, which would place it between the RACOR and the SPIN-ON
fuel filter. That being the case, it would seem that by removing the
contents of the RACOR, the FUEL VACUUM gage would read 0 since there
could would no longer be resistance, hence the RACOR filter canistor
is now empty.

Replaced Racor filter, refilled with fuel and started engine. Runs a
bit un-even. Pretty sure its starving for fuel.

HELP?!

Thanks
Jay Darst
85PT40 6V92
SpringfieldIL
--- In WanderlodgeForum@yahoogroups.com, John Suter
wrote:
> Jay,
>
> I do not want to be an alarmist, however check the
> castings and flanges which deliver the boost air to
> the engine (I think to the aftercooler) for cracks
> that permit pressure leaks. Just before FMCA I saw
> coach with symptoms that you describe, which delivered
> leaking hot exhaust air into combustible areas of the
> engine compartment. The cracked areas, once
> discovered, were barely visable behind the large fan
> but careful inspection permitted first a fingernail,
> then a knife blade to be inserted into the gaps.
>
> John Suter
>
>
>
> --- Jay Darst wrote:
> > Just returned from a 876 mile round trip to Elkhart
> > Lake, WI.
> >
> > Noticed the fuel vacuum gage in the red. So changed
> > Racor fuel
> > before heading back home. Still the gage read in the
> > RED. So, 1/3 of
> > the way home, changed the spin on fuel filter. Still
> > the gage read
> > in the RED.
> >
> > The gage seems to have always worked before.
> >
> > Before and after changing the Racor filter and
> > subsequently the spin
> > on fuel filer, my boost gage would see 20psi.
> >
> > Later, when almost home(and dead dog tired) seemed
> > that power was
> > less than normal and boost would only see 15psi.
> >
> > The last tank of fuel was treated with Lucas fuel
> > treatment, 1
> > gallon Lucas to 300 gallons of fuel.
> >
> > Any suggestions as to why the loss of power and
> > boost with fresh
> > filters?
> >
> > Thanks
> > Jay Darst
> > 85PT40 6V92 Detroit
> > Springfield, IL
> >
> >
> >
> >
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com





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[Non-text portions of this message have been removed]

[Jay Darst]

I think there were some posts on that a year or 2 ago.

Good thought, Thanks.

Jay Darst
85PT40 6V92
SpringfieldIL


--- In WanderlodgeForum@yahoogroups.com, "Mike Hohnstein"
<MHOHNSTEIN@w...> wrote:
> Some times them hoses delaminate, it's not good when that
happens. I had problems that I suspected were due to old flexible
line. I replaced it all, stuff wears out.
> Mike Hohnstein
> Germantown, WI
> 83FC35
> ----- Original Message -----
> From: Jay Darst
> To: WanderlodgeForum@yahoogroups.com
> Sent: Monday, May 02, 2005 9:16 PM
> Subject: [WanderlodgeForum] Re: Reduced power and Reduced turbo
boost
>
>
> The "FUEL VACUUM" gage is now reading very high into the red,
which
> would indicate that the fuel pump is really having to work(suck)
to
> pull fuel through the Racor.
>
> I would use air pressure to relieve any blockage in the fuel
line
> that connects the fuel tank to the Racor, but then how would the
> line be refilled so as to avoid air in the line?
>
> With the "FUEL VACUUM" gage reading an unusually high vacuum, I
am
> fairly certain that this is a fuel delivery problem.
>
> So far, attempted repairs in chronological order:
> 1.)replace Racor fuel filter
> 2.)replace Spin-On fuel filter
> 3.)Again, remove and inspect Racor filter, empty contents of
Racor
> filter, remove bottom half of Racor filter for inspection and
> cleaning.
>
> It appears that the FUEL VACUUM gage is plumbed directly aftter
the
> RACOR filter, which would place it between the RACOR and the
SPIN-ON
> fuel filter. That being the case, it would seem that by removing
the
> contents of the RACOR, the FUEL VACUUM gage would read 0 since
there
> could would no longer be resistance, hence the RACOR filter
canistor
> is now empty.
>
> Replaced Racor filter, refilled with fuel and started engine.
Runs a
> bit un-even. Pretty sure its starving for fuel.
>
> HELP?!
>
> Thanks
> Jay Darst
> 85PT40 6V92
> SpringfieldIL
> --- In WanderlodgeForum@yahoogroups.com, John Suter
> wrote:
> > Jay,
> >
> > I do not want to be an alarmist, however check the
> > castings and flanges which deliver the boost air to
> > the engine (I think to the aftercooler) for cracks
> > that permit pressure leaks. Just before FMCA I saw
> > coach with symptoms that you describe, which delivered
> > leaking hot exhaust air into combustible areas of the
> > engine compartment. The cracked areas, once
> > discovered, were barely visable behind the large fan
> > but careful inspection permitted first a fingernail,
> > then a knife blade to be inserted into the gaps.
> >
> > John Suter
> >
> >
> >
> > --- Jay Darst wrote:
> > > Just returned from a 876 mile round trip to Elkhart
> > > Lake, WI.
> > >
> > > Noticed the fuel vacuum gage in the red. So changed
> > > Racor fuel
> > > before heading back home. Still the gage read in the
> > > RED. So, 1/3 of
> > > the way home, changed the spin on fuel filter. Still
> > > the gage read
> > > in the RED.
> > >
> > > The gage seems to have always worked before.
> > >
> > > Before and after changing the Racor filter and
> > > subsequently the spin
> > > on fuel filer, my boost gage would see 20psi.
> > >
> > > Later, when almost home(and dead dog tired) seemed
> > > that power was
> > > less than normal and boost would only see 15psi.
> > >
> > > The last tank of fuel was treated with Lucas fuel
> > > treatment, 1
> > > gallon Lucas to 300 gallons of fuel.
> > >
> > > Any suggestions as to why the loss of power and
> > > boost with fresh
> > > filters?
> > >
> > > Thanks
> > > Jay Darst
> > > 85PT40 6V92 Detroit
> > > Springfield, IL
> > >
> > >
> > >
> > >
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Tired of spam? Yahoo! Mail has the best spam protection
around
> > http://mail.yahoo.com
>
>
>
>
>
> -------------------------------------------------------------------
-----------
> Yahoo! Groups Links
>
> a.. To visit your group on the web, go to:
> http://groups.yahoo.com/group/WanderlodgeForum/
>
> b.. To unsubscribe from this group, send an email to:
> WanderlodgeForum-unsubscribe@yahoogroups.com
>
> c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms
of Service.
>
>
>
> [Non-text portions of this message have been removed]

[Jay Darst]

How would I test the hoses for delamination? (other than the obvious-
replace them)

Has anyone ran into this and the fix was something other than the
filters or hose delamination?

Sure would appreciate suggestions...

Thanks
Jay Darst
85PT40 6V92
SpringfieldIL

RandyD?





--- In WanderlodgeForum@yahoogroups.com, "Jay Darst"
wrote:
> I think there were some posts on that a year or 2 ago.
>
> Good thought, Thanks.
>
> Jay Darst
> 85PT40 6V92
> SpringfieldIL
>
>
> --- In WanderlodgeForum@yahoogroups.com, "Mike Hohnstein"
> <MHOHNSTEIN@w...> wrote:
> > Some times them hoses delaminate, it's not good when that
> happens. I had problems that I suspected were due to old flexible
> line. I replaced it all, stuff wears out.
> > Mike Hohnstein
> > Germantown, WI
> > 83FC35
> > ----- Original Message -----
> > From: Jay Darst
> > To: WanderlodgeForum@yahoogroups.com
> > Sent: Monday, May 02, 2005 9:16 PM
> > Subject: [WanderlodgeForum] Re: Reduced power and Reduced
turbo
> boost
> >
> >
> > The "FUEL VACUUM" gage is now reading very high into the red,
> which
> > would indicate that the fuel pump is really having to work
(suck)
> to
> > pull fuel through the Racor.
> >
> > I would use air pressure to relieve any blockage in the fuel
> line
> > that connects the fuel tank to the Racor, but then how would
the
> > line be refilled so as to avoid air in the line?
> >
> > With the "FUEL VACUUM" gage reading an unusually high vacuum,
I
> am
> > fairly certain that this is a fuel delivery problem.
> >
> > So far, attempted repairs in chronological order:
> > 1.)replace Racor fuel filter
> > 2.)replace Spin-On fuel filter
> > 3.)Again, remove and inspect Racor filter, empty contents of
> Racor
> > filter, remove bottom half of Racor filter for inspection and
> > cleaning.
> >
> > It appears that the FUEL VACUUM gage is plumbed directly
aftter
> the
> > RACOR filter, which would place it between the RACOR and the
> SPIN-ON
> > fuel filter. That being the case, it would seem that by
removing
> the
> > contents of the RACOR, the FUEL VACUUM gage would read 0 since
> there
> > could would no longer be resistance, hence the RACOR filter
> canistor
> > is now empty.
> >
> > Replaced Racor filter, refilled with fuel and started engine.
> Runs a
> > bit un-even. Pretty sure its starving for fuel.
> >
> > HELP?!
> >
> > Thanks
> > Jay Darst
> > 85PT40 6V92
> > SpringfieldIL
> > --- In WanderlodgeForum@yahoogroups.com, John Suter
> > wrote:
> > > Jay,
> > >
> > > I do not want to be an alarmist, however check the
> > > castings and flanges which deliver the boost air to
> > > the engine (I think to the aftercooler) for cracks
> > > that permit pressure leaks. Just before FMCA I saw
> > > coach with symptoms that you describe, which delivered
> > > leaking hot exhaust air into combustible areas of the
> > > engine compartment. The cracked areas, once
> > > discovered, were barely visable behind the large fan
> > > but careful inspection permitted first a fingernail,
> > > then a knife blade to be inserted into the gaps.
> > >
> > > John Suter
> > >
> > >
> > >
> > > --- Jay Darst wrote:
> > > > Just returned from a 876 mile round trip to Elkhart
> > > > Lake, WI.
> > > >
> > > > Noticed the fuel vacuum gage in the red. So changed
> > > > Racor fuel
> > > > before heading back home. Still the gage read in the
> > > > RED. So, 1/3 of
> > > > the way home, changed the spin on fuel filter. Still
> > > > the gage read
> > > > in the RED.
> > > >
> > > > The gage seems to have always worked before.
> > > >
> > > > Before and after changing the Racor filter and
> > > > subsequently the spin
> > > > on fuel filer, my boost gage would see 20psi.
> > > >
> > > > Later, when almost home(and dead dog tired) seemed
> > > > that power was
> > > > less than normal and boost would only see 15psi.
> > > >
> > > > The last tank of fuel was treated with Lucas fuel
> > > > treatment, 1
> > > > gallon Lucas to 300 gallons of fuel.
> > > >
> > > > Any suggestions as to why the loss of power and
> > > > boost with fresh
> > > > filters?
> > > >
> > > > Thanks
> > > > Jay Darst
> > > > 85PT40 6V92 Detroit
> > > > Springfield, IL
> > > >
> > > >
> > > >
> > > >
> > >
> > > __________________________________________________
> > > Do You Yahoo!?
> > > Tired of spam? Yahoo! Mail has the best spam protection
> around
> > > http://mail.yahoo.com
> >
> >
> >
> >
> >
> > -----------------------------------------------------------------
--
> -----------
> > Yahoo! Groups Links
> >
> > a.. To visit your group on the web, go to:
> > http://groups.yahoo.com/group/WanderlodgeForum/
> >
> > b.. To unsubscribe from this group, send an email to:
> > WanderlodgeForum-unsubscribe@yahoogroups.com
> >
> > c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms
> of Service.
> >
> >
> >
> > [Non-text portions of this message have been removed]

[Jeff August]

Boy I wish I could help but my gauge dosn't work, at least thats what
I suspect as it seems to run fine?
Did you and Dan enjoy our wonderful Wi. weather?
I looked around for your Birds Sunday but didn't see them, a freind
stoped over today and said he saw one on the road last weekend, I
told him it was one of you two. Good luck!
Jeff& Michelle August
1980FC35RB(with a hole cut in the shower wall to fix broken pipe)
Plymouth Wi.
--- In WanderlodgeForum@yahoogroups.com, "Jay Darst"
wrote:
> How would I test the hoses for delamination? (other than the
obvious-
> replace them)
>
> Has anyone ran into this and the fix was something other than the
> filters or hose delamination?
>
> Sure would appreciate suggestions...
>
> Thanks
> Jay Darst
> 85PT40 6V92
> SpringfieldIL
>
> RandyD?
>
>
>
>
>
> --- In WanderlodgeForum@yahoogroups.com, "Jay Darst"
> wrote:
> > I think there were some posts on that a year or 2 ago.
> >
> > Good thought, Thanks.
> >
> > Jay Darst
> > 85PT40 6V92
> > SpringfieldIL
> >
> >
> > --- In WanderlodgeForum@yahoogroups.com, "Mike Hohnstein"
> > <MHOHNSTEIN@w...> wrote:
> > > Some times them hoses delaminate, it's not good when that
> > happens. I had problems that I suspected were due to old
flexible
> > line. I replaced it all, stuff wears out.
> > > Mike Hohnstein
> > > Germantown, WI
> > > 83FC35
> > > ----- Original Message -----
> > > From: Jay Darst
> > > To: WanderlodgeForum@yahoogroups.com
> > > Sent: Monday, May 02, 2005 9:16 PM
> > > Subject: [WanderlodgeForum] Re: Reduced power and Reduced
> turbo
> > boost
> > >
> > >
> > > The "FUEL VACUUM" gage is now reading very high into the red,
> > which
> > > would indicate that the fuel pump is really having to work
> (suck)
> > to
> > > pull fuel through the Racor.
> > >
> > > I would use air pressure to relieve any blockage in the fuel
> > line
> > > that connects the fuel tank to the Racor, but then how would
> the
> > > line be refilled so as to avoid air in the line?
> > >
> > > With the "FUEL VACUUM" gage reading an unusually high vacuum,
> I
> > am
> > > fairly certain that this is a fuel delivery problem.
> > >
> > > So far, attempted repairs in chronological order:
> > > 1.)replace Racor fuel filter
> > > 2.)replace Spin-On fuel filter
> > > 3.)Again, remove and inspect Racor filter, empty contents of
> > Racor
> > > filter, remove bottom half of Racor filter for inspection and
> > > cleaning.
> > >
> > > It appears that the FUEL VACUUM gage is plumbed directly
> aftter
> > the
> > > RACOR filter, which would place it between the RACOR and the
> > SPIN-ON
> > > fuel filter. That being the case, it would seem that by
> removing
> > the
> > > contents of the RACOR, the FUEL VACUUM gage would read 0
since
> > there
> > > could would no longer be resistance, hence the RACOR filter
> > canistor
> > > is now empty.
> > >
> > > Replaced Racor filter, refilled with fuel and started engine.
> > Runs a
> > > bit un-even. Pretty sure its starving for fuel.
> > >
> > > HELP?!
> > >
> > > Thanks
> > > Jay Darst
> > > 85PT40 6V92
> > > SpringfieldIL
> > > --- In WanderlodgeForum@yahoogroups.com, John Suter
> > > wrote:
> > > > Jay,
> > > >
> > > > I do not want to be an alarmist, however check the
> > > > castings and flanges which deliver the boost air to
> > > > the engine (I think to the aftercooler) for cracks
> > > > that permit pressure leaks. Just before FMCA I saw
> > > > coach with symptoms that you describe, which delivered
> > > > leaking hot exhaust air into combustible areas of the
> > > > engine compartment. The cracked areas, once
> > > > discovered, were barely visable behind the large fan
> > > > but careful inspection permitted first a fingernail,
> > > > then a knife blade to be inserted into the gaps.
> > > >
> > > > John Suter
> > > >
> > > >
> > > >
> > > > --- Jay Darst wrote:
> > > > > Just returned from a 876 mile round trip to Elkhart
> > > > > Lake, WI.
> > > > >
> > > > > Noticed the fuel vacuum gage in the red. So changed
> > > > > Racor fuel
> > > > > before heading back home. Still the gage read in the
> > > > > RED. So, 1/3 of
> > > > > the way home, changed the spin on fuel filter. Still
> > > > > the gage read
> > > > > in the RED.
> > > > >
> > > > > The gage seems to have always worked before.
> > > > >
> > > > > Before and after changing the Racor filter and
> > > > > subsequently the spin
> > > > > on fuel filer, my boost gage would see 20psi.
> > > > >
> > > > > Later, when almost home(and dead dog tired) seemed
> > > > > that power was
> > > > > less than normal and boost would only see 15psi.
> > > > >
> > > > > The last tank of fuel was treated with Lucas fuel
> > > > > treatment, 1
> > > > > gallon Lucas to 300 gallons of fuel.
> > > > >
> > > > > Any suggestions as to why the loss of power and
> > > > > boost with fresh
> > > > > filters?
> > > > >
> > > > > Thanks
> > > > > Jay Darst
> > > > > 85PT40 6V92 Detroit
> > > > > Springfield, IL
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > > __________________________________________________
> > > > Do You Yahoo!?
> > > > Tired of spam? Yahoo! Mail has the best spam protection
> > around
> > > > http://mail.yahoo.com
> > >
> > >
> > >
> > >
> > >
> > > ----------------------------------------------------------------
-
> --
> > -----------
> > > Yahoo! Groups Links
> > >
> > > a.. To visit your group on the web, go to:
> > > http://groups.yahoo.com/group/WanderlodgeForum/
> > >
> > > b.. To unsubscribe from this group, send an email to:
> > > WanderlodgeForum-unsubscribe@yahoogroups.com
> > >
> > > c.. Your use of Yahoo! Groups is subject to the Yahoo!
Terms
> > of Service.
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]

[George Lowry]

HI Jay,

Yep, it was a different engine but the bellows expansion joint on one
of the exhaust pipes blew a hole in it. No only did I lose turbo
pressure but the exhaust gas almost burned thru a water line. Another
time had the exhaust manifold gaskets blow out. The filters are the
easy things to check. The others can be found by running you hand
close to the various parts and seeing if hot gases are blowing on it.
Must be careful to not get too close. I had an exhaust manifold nut
come loose once and that allowed the gasket to go. Anything that does
not allow the free flow of exhaust gas from the cylinders thru the
turbo and out the exhaust pipe can be a problem...

I don't remember if the 92 series had the emergency shutdown baffle in
the intake or not. I am under the impression that they had changed the
rack by that time so it was not needed. You can tell if you have an
emergency shutdown button on the dash. If you do, they told us when I
went thru Detroit Overhaul School that it was not uncommon for that
baffle to twist on the rod and partially close off the air intake. The
Detroit overhaul manuals have a complete checklist on what to check
for low power.

If you have lots of black smoke at high throttle, it is an
indication of low air flow/over fueling. If you have no smoke at high
throttle, it is an indication of low fuel delivery.

My new rig has a Series 60, four stroke that I am trying to learn and
I am tending to forget all I was taught on the two strokers.

Hope this helps.

George Lowry
'95 WBDA 4203 & GM 4106 (for sale)
Spearfish, SD

Jay Darst wrote:

> How would I test the hoses for delamination? (other than the obvious-
> replace them)
>
> Has anyone ran into this and the fix was something other than the
> filters or hose delamination?
>
> Sure would appreciate suggestions...
>
> Thanks
> Jay Darst
> 85PT40 6V92
> SpringfieldIL
>
> RandyD?
>
>
>
>
>
> --- In WanderlodgeForum@yahoogroups.com, "Jay Darst"
> wrote:
>
>>I think there were some posts on that a year or 2 ago.
>>
>>Good thought, Thanks.
>>
>>Jay Darst
>>85PT40 6V92
>>SpringfieldIL
>>
>>
>>--- In WanderlodgeForum@yahoogroups.com, "Mike Hohnstein"
>><MHOHNSTEIN@w...> wrote:
>>
>>>Some times them hoses delaminate, it's not good when that
>>
>>happens. I had problems that I suspected were due to old flexible
>>line. I replaced it all, stuff wears out.
>>
>>>Mike Hohnstein
>>>Germantown, WI
>>>83FC35
>>> ----- Original Message -----
>>> From: Jay Darst
>>> To: WanderlodgeForum@yahoogroups.com
>>> Sent: Monday, May 02, 2005 9:16 PM
>>> Subject: [WanderlodgeForum] Re: Reduced power and Reduced
>
> turbo
>
>>boost
>>
>>>
>>> The "FUEL VACUUM" gage is now reading very high into the red,
>>
>>which
>>
>>> would indicate that the fuel pump is really having to work
>
> (suck)
>
>>to
>>
>>> pull fuel through the Racor.
>>>
>>> I would use air pressure to relieve any blockage in the fuel
>>
>>line
>>
>>> that connects the fuel tank to the Racor, but then how would
>
> the
>
>>> line be refilled so as to avoid air in the line?
>>>
>>> With the "FUEL VACUUM" gage reading an unusually high vacuum,
>
> I
>
>>am
>>
>>> fairly certain that this is a fuel delivery problem.
>>>
>>> So far, attempted repairs in chronological order:
>>> 1.)replace Racor fuel filter
>>> 2.)replace Spin-On fuel filter
>>> 3.)Again, remove and inspect Racor filter, empty contents of
>>
>>Racor
>>
>>> filter, remove bottom half of Racor filter for inspection and
>>> cleaning.
>>>
>>> It appears that the FUEL VACUUM gage is plumbed directly
>
> aftter
>
>>the
>>
>>> RACOR filter, which would place it between the RACOR and the
>>
>>SPIN-ON
>>
>>> fuel filter. That being the case, it would seem that by
>
> removing
>
>>the
>>
>>> contents of the RACOR, the FUEL VACUUM gage would read 0 since
>>
>>there
>>
>>> could would no longer be resistance, hence the RACOR filter
>>
>>canistor
>>
>>> is now empty.
>>>
>>> Replaced Racor filter, refilled with fuel and started engine.
>>
>>Runs a
>>
>>> bit un-even. Pretty sure its starving for fuel.
>>>
>>> HELP?!
>>>
>>> Thanks
>>> Jay Darst
>>> 85PT40 6V92
>>> SpringfieldIL
>>> --- In WanderlodgeForum@yahoogroups.com, John Suter
>>> wrote:
>>> > Jay,
>>> >
>>> > I do not want to be an alarmist, however check the
>>> > castings and flanges which deliver the boost air to
>>> > the engine (I think to the aftercooler) for cracks
>>> > that permit pressure leaks. Just before FMCA I saw
>>> > coach with symptoms that you describe, which delivered
>>> > leaking hot exhaust air into combustible areas of the
>>> > engine compartment. The cracked areas, once
>>> > discovered, were barely visable behind the large fan
>>> > but careful inspection permitted first a fingernail,
>>> > then a knife blade to be inserted into the gaps.
>>> >
>>> > John Suter
>>> >
>>> >
>>> >
>>> > --- Jay Darst wrote:
>>> > > Just returned from a 876 mile round trip to Elkhart
>>> > > Lake, WI.
>>> > >
>>> > > Noticed the fuel vacuum gage in the red. So changed
>>> > > Racor fuel
>>> > > before heading back home. Still the gage read in the
>>> > > RED. So, 1/3 of
>>> > > the way home, changed the spin on fuel filter. Still
>>> > > the gage read
>>> > > in the RED.
>>> > >
>>> > > The gage seems to have always worked before.
>>> > >
>>> > > Before and after changing the Racor filter and
>>> > > subsequently the spin
>>> > > on fuel filer, my boost gage would see 20psi.
>>> > >
>>> > > Later, when almost home(and dead dog tired) seemed
>>> > > that power was
>>> > > less than normal and boost would only see 15psi.
>>> > >
>>> > > The last tank of fuel was treated with Lucas fuel
>>> > > treatment, 1
>>> > > gallon Lucas to 300 gallons of fuel.
>>> > >
>>> > > Any suggestions as to why the loss of power and
>>> > > boost with fresh
>>> > > filters?
>>> > >
>>> > > Thanks
>>> > > Jay Darst
>>> > > 85PT40 6V92 Detroit
>>> > > Springfield, IL
>>> > >
>>> > >
>>> > >
>>> > >
>>> >
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>>>
>>>
>>>
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>>
>>>
>>>
>>>[Non-text portions of this message have been removed]
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
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>
>
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>
>

[john duke]

Hi Jay
Yes, but before I write all about it , I'll finish the
forum first since some-one might have answered already
Juergen in PA
1991 WLSP36
--- Jay Darst wrote:
> Just returned from a 876 mile round trip to Elkhart
> Lake, WI.
>
> Noticed the fuel vacuum gage in the red. So changed
> Racor fuel
> before heading back home. Still the gage read in the
> RED. So, 1/3 of
> the way home, changed the spin on fuel filter. Still
> the gage read
> in the RED.
>
> The gage seems to have always worked before.
>
> Before and after changing the Racor filter and
> subsequently the spin
> on fuel filer, my boost gage would see 20psi.
>
> Later, when almost home(and dead dog tired) seemed
> that power was
> less than normal and boost would only see 15psi.
>
> The last tank of fuel was treated with Lucas fuel
> treatment, 1
> gallon Lucas to 300 gallons of fuel.
>
> Any suggestions as to why the loss of power and
> boost with fresh
> filters?
>
> Thanks
> Jay Darst
> 85PT40 6V92 Detroit
> Springfield, IL
>
>
>
>

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