A lot of oil coming out of air tanks and purge valve need help .

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Nestor, Mar 1, 2018.

  1. Nestor

    Nestor Light Load Member

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    hey guys wondering if ya can help me with a problem I’m having . My Bendix purge valve seems like it purges oil. Checked my air tanks and it shoots out oil. Is it time for a new compressor ?? I noticed I burn about a gallon a week of oil. Truck has noticible blow by also . But don’t think that has to do with it . It got it from one week to another . I’ll post some pic of my compressor . It’s on. Peterbilt 379 1997 . 3406 e model thanks guys
     
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  3. Goodysnap

    Goodysnap Road Train Member

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    Remove the intake or charge air from the air compressor to isolate the engine from the compressor. Inspect the intake for wetness or oil coming from the engine. Run the engine with the discharge line off and the compressor building...hold a piece of cardboard or sheet of paper to the discarge port at the compressor. If it spatters the paper with the intake off the compressor is passing oil, no question. If the intake is wet suspect engine issues.

    Air systems can be a bugger to clean of oil. Flush the line from compessor to the dryer really good and replace the dryer complete with a reman or new.
     
  4. Nestor

    Nestor Light Load Member

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    Thanks for the reply man. So can u shoot me in the right direction on how to do that . I’ll upload some pics
     

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  5. Goodysnap

    Goodysnap Road Train Member

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    Sure, intake is on the side. Discharge is the stainless braid on the top of the compressor.
     
    Rideandrepair and baha Thank this.
  6. Nestor

    Nestor Light Load Member

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    Is this the intake ? In goes into block (first pic) second pic what is that line ? It goes over to the other side of engine?maybe coolant ? And third pic this was leaking
     

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  7. 062

    062 Road Train Member

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    The third pic is intake,facing away from motor.
     
  8. Nestor

    Nestor Light Load Member

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    So I took off intake the one u said and there’s suction on the intake. Nothing coming out of the line
     
  9. Goodysnap

    Goodysnap Road Train Member

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    First 2 pics are coolant in and out. The last pic on the bottom with the aluminum 2 bolt flange is the intake.
     
  10. Nestor

    Nestor Light Load Member

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    Thanks buddy . So I took off discharge line and no oil . I disconnected intake . Still no oil out the discharge.the intake on the compressor does accumulate oil on that Elbow fitting . It seems kinda wet instide there
     
  11. Nestor

    Nestor Light Load Member

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    Also the small top line coming out of the air governer is all wet in oil
     
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