Zero Turbo Boost Follow Up

[nicodemus815@...]

Well, I was able to access the engine (thanks Curt, the hatch is under the
drawer assembly) and noticed the blue .25" hose that connects the turbo to the
boost gauge on the dash had blown off. I got another ferrel and re-attatched
it. Took it for a test spin, and everything works fine.

Now the 2nd problem....All the Newmar owners at the rally here in Quartzsite
think I know what I am doing, and are asking me to help them with their
problems! Hahahaha!

Steve Harrie
'86 PT38 8v92


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

[Curt Sprenger]

Steve,
Enjoy the ride! Glad you got the problem resolved.

Curt Sprenger 1987 PT38, Anaheim Hills, Calif.



nicodemus815@... wrote:

> Well, I was able to access the engine (thanks Curt, the hatch is under
> the
> drawer assembly) and noticed the blue .25" hose that connects the
> turbo to the
> boost gauge on the dash had blown off. I got another ferrel and
> re-attatched
> it. Took it for a test spin, and everything works fine.
>
> Now the 2nd problem....All the Newmar owners at the rally here in
> Quartzsite
> think I know what I am doing, and are asking me to help them with their
> problems! Hahahaha!
>
> Steve Harrie
> '86 PT38 8v92
>
>
> [Non-text portions of this message have been removed]
>
>
>
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[John Suter]

WOW Steve. Do I understand that a 1/4" opening was
the sole cause of virtually all loss of power?

John Suter


--- nicodemus815@... wrote:

> Well, I was able to access the engine (thanks Curt,
> the hatch is under the
> drawer assembly) and noticed the blue .25" hose that
> connects the turbo to the
> boost gauge on the dash had blown off. I got another
> ferrel and re-attatched
> it. Took it for a test spin, and everything works
> fine.
>
> Now the 2nd problem....All the Newmar owners at the
> rally here in Quartzsite
> think I know what I am doing, and are asking me to
> help them with their
> problems! Hahahaha!
>
> Steve Harrie
> '86 PT38 8v92
>
>
> [Non-text portions of this message have been
> removed]
>
>


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[nicodemus815@...]

>WOW Steve. Do I understand that a 1/4" opening was the sole cause of
virtually all loss of power?


I was able to drive at 50MPH on a flat road. I was unable to accelerate
faster though. I was able to stop and start and build up momentum, until I
reached
50+/- MPH again. I'm glad I didn't have to go up a mountain though.

The hose appears to go to the dash gauge. I guess the 0.25" hole was enough
to prevent the pressure from building up and forcing air in the cylinders. I'm
thinking I hardly ever got above 15psi of boost, so I guess it is conceivable
that the . 25" hole could leak that much pressure. I'll watch the #'s more
closely on the way home to see what my boost pressure is.

What do the experts say......

Steve Harrie
8v92 '86PT38


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

[John Suter]

Thanks for taking the trouble to answer, Steve.

I suppose when the 1/4" opening connects to a gauge,
no actual "flow" exists as the purpose is to measure
pressure under closed conditions. However, my guess
is when an opening does occur, the outflow could/would
consist of hot gasses, which could be hazardous. My
concern is where any hot gasses are going!!! Perhaps
other members can comment on whether your specific
1/4" tube opening could become hot.

What I do know from personal observation is when a
crack in the manifold occurs (a crack barely wide
enough to insert a fingernail, and about 6 inches
long) it can create a serious firehazard, and has. My
guess is that size crack might permit more to escape
than the 1/4" diameter hole you experienced.

Whatever the circumstances of sudden unexplained
loss of power accompanied by unusual low turbo
pressure readings, Forum members need to seriously
heed the warning to shut off the engine and grab a
fire extinguisher on the way out the door; coaches and
belongings can be replaced, our fine members are
irreplaceable.

John Suter


--- nicodemus815@... wrote:

> >WOW Steve. Do I understand that a 1/4" opening was
> the sole cause of
> virtually all loss of power?
>
>
> I was able to drive at 50MPH on a flat road. I was
> unable to accelerate
> faster though. I was able to stop and start and
> build up momentum, until I reached
> 50+/- MPH again. I'm glad I didn't have to go up a
> mountain though.
>
> The hose appears to go to the dash gauge. I guess
> the 0.25" hole was enough
> to prevent the pressure from building up and forcing
> air in the cylinders. I'm
> thinking I hardly ever got above 15psi of boost, so
> I guess it is conceivable
> that the . 25" hole could leak that much pressure.
> I'll watch the #'s more
> closely on the way home to see what my boost
> pressure is.
>
> What do the experts say......
>
> Steve Harrie
> 8v92 '86PT38
>
>
> [Non-text portions of this message have been
> removed]
>
>


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[George Lowry]

While I have not had the line come off the turbo, I did have a 1/4"
air line come loose on another coach. It lost enough air pressure that
the brakes set up. I could not move until I found that "leak". i.e. I
could not build up enough pressure (60 psi) to release the parking
brake. Luckily I was in the entrance to a rest area at the time.

As to heat, the turbo does heat the air somewhat but not enough to be
dangerous. Remember we are dealing with intake air, not exhaust air.
It still behooves us to investigate ANY unusual readings on the gauges.

George Lowry
'06 Alpine Apex - formerly '95 WBDA 4203
Spearfish, SD Currently in Quartzsite, AZ trying to get moved from one
coach to the other.


John Suter wrote:

> Thanks for taking the trouble to answer, Steve.
>
> I suppose when the 1/4" opening connects to a gauge,
> no actual "flow" exists as the purpose is to measure
> pressure under closed conditions. However, my guess
> is when an opening does occur, the outflow could/would
> consist of hot gasses, which could be hazardous. My
> concern is where any hot gasses are going!!! Perhaps
> other members can comment on whether your specific
> 1/4" tube opening could become hot.
>
> What I do know from personal observation is when a
> crack in the manifold occurs (a crack barely wide
> enough to insert a fingernail, and about 6 inches
> long) it can create a serious firehazard, and has. My
> guess is that size crack might permit more to escape
> than the 1/4" diameter hole you experienced.
>
> Whatever the circumstances of sudden unexplained
> loss of power accompanied by unusual low turbo
> pressure readings, Forum members need to seriously
> heed the warning to shut off the engine and grab a
> fire extinguisher on the way out the door; coaches and
> belongings can be replaced, our fine members are
> irreplaceable.
>
> John Suter
>
>
> --- nicodemus815@... wrote:
>
>
>>>WOW Steve. Do I understand that a 1/4" opening was
>>
>>the sole cause of
>>virtually all loss of power?
>>
>>
>>I was able to drive at 50MPH on a flat road. I was
>>unable to accelerate
>>faster though. I was able to stop and start and
>>build up momentum, until I reached
>>50+/- MPH again. I'm glad I didn't have to go up a
>>mountain though.
>>
>>The hose appears to go to the dash gauge. I guess
>>the 0.25" hole was enough
>>to prevent the pressure from building up and forcing
>>air in the cylinders. I'm
>>thinking I hardly ever got above 15psi of boost, so
>>I guess it is conceivable
>>that the . 25" hole could leak that much pressure.
>>I'll watch the #'s more
>>closely on the way home to see what my boost
>>pressure is.
>>
>>What do the experts say......
>>
>>Steve Harrie
>>8v92 '86PT38
>>
>>
>>[Non-text portions of this message have been
>>removed]
>>
>>
>
>
>
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[nicodemus815@...]

>when an opening does occur, the outflow could/would consist of hot gasses,
which could be hazardous.

Good point John. The .25" tube that was disconnected was made of a hard
plastic. I think George was right, in that it does not carry the heated exhaust
gasses.

I'm wondering, if you had a crack on the exhaust side, would the symptoms be
a bunch of black smoke? What other gauges would go out of the normal
parameters? Other than the gauge reading zero, and a lack of acceleration,
everything
else was normal for me.

I agree that 600 degree gasses escaping into the engine compartment
could/would be dangerous.

Steve Harrie
Heading to Vegas Today


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