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Excessive smoke coming from the crankcase?

Discussion in '1982-Present GM Diesel' started by afroman006, Oct 23, 2005.

  1. afroman006

    afroman006 1/2 ton status

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    I took my trail turd (Pigpen) out for its maiden voyage this weekend and had all kinds of fin getting pissed off at it. The rear main is prety much gone so it loses about 1/4 a quart of oil every 30 minutes. It idles really rough so I think it might need a new harmonic balancer, but I'm going to try to bleed the fuel lines with it running first and see where that gets me. The biggest concern I have though is the amount of smoke the engine produces. Not the smoke coming out of the exhaust, but the crank case. I know it has the little vent thing (the gold canister with a hose conneting it to the oil filler neck and two other hoses going to each side of the intake manifold. Even with that hooked up, smoke still comes out of the oil filler and the dipstick tube. I dont know what is "normal" but this seems excessive. I read in the Haynes manual that the little gold can thing is supposed to be replaced every 70k miles and I assume the one on the motor hasnt ever been replaced. I would like to check the compression of the motor but dont have access to a gauge and cant afford one, so I'm tryin to figgure out any other methods of diagnosing the problem. I am going to have to pull the motor out to replace the rear main seal anyway, so I think I'm gonna throw new gaskets in it all around.
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Probably a bad CDR dealy (the gold can thing :D )

    Why pull it to do the rear main?

    Rene
     
  3. afroman006

    afroman006 1/2 ton status

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    Cause my home made crossmember is too close to the pan to drop it at all. Plus I want to install a MOO crossmember while I have it out.
     
  4. cegusman

    cegusman 3/4 ton status

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    Hope you have the MOO crossmember, because MOO shutdown shop.
     
  5. afroman006

    afroman006 1/2 ton status

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    Well I took the motor out and took it apart, replaced the rear main seal and put the pan back on. Its back in the truck and we just got back from the trip yesterday, the motor worked great. It still idles rough, even when it warms up. I think I'm going to raise the idle a little bit cause it smooths out as soon as you give it a little skinny pedal. I'm prety sure I have at least one bad cylinder. Once its warmed up when its running, smoke comes out of one exhaust pipe and not the other. I am running dual exhaust with no h-pipe. Like I said it runs good now, so I'm not gonna mess with it. If anyone cares, here's my buildup thread http://tamor.org/forums/showthread.php?t=5601&page=14&pp=15
     
  6. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    I've often thought that I had a little too much smoke coming from the filler neck, too. I dropped by the local GM dealership and asked the parts manager how often guys change the CDR out. He looked on the computer, scratched his head, and went back to talk to the diesel tech about it.

    He came back out and told me the reason he was confused is that he hadn't ordered one from the warehouse in over 7 years. The diesel tech told him that he could only remember one time in the last 10 years that a CDR had needed replacing.

    Just a little FYI.....
     
  7. afroman006

    afroman006 1/2 ton status

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    During the trip, my vaccuum pump started spewing oil. It was coming out of the little circle in the middle at a very high volume. I had the pump hooked up directly to the tranny, with the modulator not adjusted. The tranny was shifting, just extremely softly. Did hooking the pump up to the modulator cause it to rupture the diaphram and spew oil?
     

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