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Topic: Air leak at the throttle control (Read 353 times) previous topic - next topic

Air leak at the throttle control

Would anyone know why the check valve that is on the firewall with the throttle/cruise control be constantly leaking air? I just started it up for a trip and noticed that the air is escaping from the slot on the side. Cruise and throttle seem to work fine but the air pressure gauge keeps moving at governor cut out/in pressures. When I shut the engine off, the white needle on the gauge bleeds down to 50 psi while air escapes from the valve, then sets there and the air stops leaking.

This picture shows the valve just under the U of the wire wrapped cables.

1994 U280, Build 4490
Deming, NM.

Re: Air leak at the throttle control

Reply #1 –
That is the Pressure Reducing valve and it only operates when around 60lbs of air available. Take it apart and see if the diaphragm is leaking.
JohnH
Coachless, now use aircraft. 2003 Ford Travelair TC280 class C. Super shape. Just for 1 yr .
1994 Ford E350 ClassC,total renovation inside and out. Now sold.
2000 U295  36' Cummins 350 c/w Banks Stinger, Resonator upgrade,Solar, LED lites.Residential fridge with slide out pantry. Build 5674. Sold
ex 92 GV 022C ored Cummins. Sold
ex 95 GV240 cat 3116. Sold
2017 Mini cooper s & 2016 land Rover LR2 HSE  LUX.
jhaygarth@aol.com    SKP #130098
treat everyone as you would like to be.

Re: Air leak at the throttle control

Reply #2 –
Well that was quick. Thanks John. You are correct. Slight adjustment tap with Ozark All Purpose Adjusting Tool did the trick. Will replace first chance. Soooo.....I guess this thread is close-ed.
1994 U280, Build 4490
Deming, NM.