Reduced power and Reduced turbo boost

[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
>
>
>
>

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