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Air Leak

January 02, 2018, 03:28:11 pm

Well I need to know what is this?  I think it is part of the cruise system.  Cruise and air throttle both work fine.  Air gauge cycles between 110 and 120 psi.  White needle effected the most.  I know the when I stop the engine air to leaking/sucking around the head of the item in the pic.

Thanks for all the help, you people are GREAT.

Pat,

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Re: Air Leak

Reply #1 – January 02, 2018, 04:52:16 pm

That is the Bendix RV-1 Reducing Valve.  It regulates the input air pressure supplying the Bendix CA-1 Control Module + solenoids.  See the cruise control + throttle diagram below.  The document linked below explains the function of the RV-1, plus operating and leakage tests.  If you decide to replace it, do a Google search to find the best price.

http://www.jackdanmayer.com/Files/Bendix%20RV-1%20Reducing%20Valve.pdf

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Re: Air Leak

Reply #2 – January 02, 2018, 06:45:55 pm

On a separate subject, if your system air pressure normally cycles between a low of 110 and a high of 120, then your D2 governor is not operating correctly, and you are working your air compressor more than necessary.  You should be seeing a difference of about 30 psi between engine air compressor cut-in and cut-out.  Should be more like 90-120 psi.  You might want to try replacing the D2 and see it helps this situation.

Haldex D2 Governor Service Data

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