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Thread: Smoke coming out of oil filler and intake

  1. #1
    Registered User RNation's Avatar
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    Default Smoke coming out of oil filler and intake

    I have smoke coming out of my oil filler tube and the intake (only when the air breather off). The oil filler cap isn't a regular one, I bought this motor from boyces so I'm guessing it's some military cap. But it looks like a miniature keg in shape, and it's a little bigger than an injector in size. But I'm getting a smoke or smog that comes out of it when I shut the truck off. The smoke isn't "bulky" like what would usually come out of the tailpipe. It's more like the smoke that comes off the end of a lit cigarette.

    I'm not sure if this from blow by or not. Also I'm not sure how much blow by would indicate a problem.
    84 Suburban 6.2
    3/4 ton
    Rear wheel drive

  2. #2
    Registered User NVW's Avatar
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    Sounds like blowby, does it smoke a lot with the oil fill cap off and engine running?
    Leo
    * 95 GMC 3500 4x4 dually, VIN "F", 4.10 gears, 4L80/E trans, 405,000km, 3" downpipe, 4" exhaust, FSD mounted on heat sink in bumper, #9 resistor, 3 pillar gauge's, High Idle kit, Bosch marine injectors, Bosch Duraterm glow plugs, Leroy's ATT chip, ATT, GP overide, K47 airbox, FTB, Racor fuel filter, fuel pressure gauge
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    Quarter Million Worth btfarm's Avatar
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    Default

    I know on a gas motor that can be due to water in the oil cooking off. Is it after a long or short run? Is there a white slimy deposit on the walls of the filler tube?
    Mike
    2006 GMC 2500HD LBZ ext/sb Black. 265,000 miles and 6085 hrs as of 8/19/14. Predator tune (at 133k) WAS Totally stock except tires (285 BFG KOs), hitch, Line-X over the rail. Westin bars, Adrian crossover box, Putnam XDR Class V hitch / Prodigy Brake control. Blocked, fingered and pcv reroute. Full 4" Diamond Eye SS Exh from Leroy Diesel
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  4. #4

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    Hvae you changed the oil in it ? If you put your hand over the oil fill with the cap off does it seem to have any "pressure" ?
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  5. #5
    Registered User RNation's Avatar
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    It was too dark when I got home to see the smoke so I'll have to wait till in the morning.

    No white slimy stuff on the sides of filler tube. I'll test tommorrow on a short run and long run when I can see the smoke.

    I just changed the oil the oil 2 days ago, but haven't payed attention to see if it was still smoking after that or not (I didn't know that could make it stop). I didn't notice any pressure with my hand covering the filler tube but it's hard to tell with the fan blowing all that air around.

    I did notice that the oil was pretty low when I channged it. I think it was 2-3 quarts low.
    84 Suburban 6.2
    3/4 ton
    Rear wheel drive

  6. #6

    Default

    Is your entire air intake system intact? GM designed it a certain way. Everything up to and including the air silencer must be in place and hooked up. I thought i could "do one better" and delete that restrictive air silencer, so i did. My CDR stopped functioning. Today i tried something and move my hand close to, but not over the open intake tube. With my hand as a slight "restriction" the blowby vanished from the filler tube. Turns out that intake silencer allows for just enough vacuum at idle for the CDR to work properly. Remove it, and there's no restriction, so the engine smokes from the oil filler since the CDR no longer has the slight vacuum it needs to work properly.

    I ended up putting the silencer back today and the blowby i thought was "new" almost vanished from the oil filler(back to the very slight almost not visible state it was in when i bought the truck) since the CDR is working correctly again.

    It could be something as simple as that.

    Lets not forget. Blowby is going to be natural as the engine wears. These engines start life with none, and usually end life with clouds of it. Blowby gives you a general idea of how well your piston rings are sealing against the cylinder walls. The more blowby the engine has, the worse the rings are sealing. Abuse or infrequent oil changes will just make the engine wear, and therefore the blowby, worse.

    1996 GMC Sierra SL C2500HD regular cab 6.5L turbo diesel "F" vin Boost and EGT on A-pillar, Heath remote FSD,Heath Max-e-torq GL4, Heath Turbomaster, 3" DP,2.5" crossover, 5" stacks AMSOIL
    85 K-5 Blazer, 379T Detroit Diesel , SM465/NP208 "The Rust Bucket"

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  7. #7
    Registered User RNation's Avatar
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    The intake silencer is going to be the air breather right? If so, then I believe everythings hooked up right. Maybe the CDR is clogged or something, or maybe the air filter is clogged?

    I didn't know the blow by was from that. That's good to know.
    84 Suburban 6.2
    3/4 ton
    Rear wheel drive

  8. #8

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    The silencer is that big muffler that goes in-between the port up front by the grille for the plastic tubing and the air filter housing. It's held in place by a band clamp and 2 1/2" or 13MM head bolts. The bracket for the air silencer goes down to two exhaust manifold studs and also has a bracket that goes from the silencer holder to the alternator through bolt for stability reasons.

    The silencer doesn't cause blowby. It just provides enough vacuum for the CDR system to work correctly and manage said blowby. If that's all intact and you still have a good bit of blowby coming from the oil filler then it's more than the CDR can handle, which means it's excessive.

    1996 GMC Sierra SL C2500HD regular cab 6.5L turbo diesel "F" vin Boost and EGT on A-pillar, Heath remote FSD,Heath Max-e-torq GL4, Heath Turbomaster, 3" DP,2.5" crossover, 5" stacks AMSOIL
    85 K-5 Blazer, 379T Detroit Diesel , SM465/NP208 "The Rust Bucket"

    "People should not be afraid of their governments, governments should be afraid of their people." - V

    How can liberals stand up to terrorists, when they can't even stand up to fox news?

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  9. #9
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    how many mile son your current engine?

    Just sounds like your engine is getting tired (ring and cylinder wear) and has a bit of blow by.

    LIke so:

    Last edited by great white; 12-10-2010 at 11:02 AM.

  10. #10
    Registered User RNation's Avatar
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    My silencer is missing then. All I have is the air breather with the open port on it, but nothing connecting to that. Perhaps I should find one.

    Also I noticed the smoke coming out of the filler tube with the cap off right after i started the truck.

    I'm not sure how many miles are on the motor, I'm guessing theres less than 100k though. I bought the drop in motor from boyces and they said they don't know the miles on any of the motors but they say that they dont really see any motors with more than 50k miles but as low as 12k. I've only put on about 8k since I put it in.

    Now that I think about it, I don't see why they don't mark the motors with the miles.
    84 Suburban 6.2
    3/4 ton
    Rear wheel drive

  11. #11
    Registered User NVW's Avatar
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    Quote Originally Posted by RNation View Post
    My silencer is missing then. All I have is the air breather with the open port on it, but nothing connecting to that. Perhaps I should find one.

    Also I noticed the smoke coming out of the filler tube with the cap off right after i started the truck.

    I'm not sure how many miles are on the motor, I'm guessing theres less than 100k though. I bought the drop in motor from boyces and they said they don't know the miles on any of the motors but they say that they dont really see any motors with more than 50k miles but as low as 12k. I've only put on about 8k since I put it in.

    Now that I think about it, I don't see why they don't mark the motors with the miles.
    If it's open you need to plug it with a frost plug or something similar.
    Leo
    * 95 GMC 3500 4x4 dually, VIN "F", 4.10 gears, 4L80/E trans, 405,000km, 3" downpipe, 4" exhaust, FSD mounted on heat sink in bumper, #9 resistor, 3 pillar gauge's, High Idle kit, Bosch marine injectors, Bosch Duraterm glow plugs, Leroy's ATT chip, ATT, GP overide, K47 airbox, FTB, Racor fuel filter, fuel pressure gauge
    * 98 Chev. 1500 4x4 VIN "S", 3.73 gears 250,000 km, (needs work)
    * 97 GMC C3500 VIN "F", 4.10 gears, 5 spd manual, 324,000 k (parts)
    * 04 Yukon Denali, 6.0, 196,000 km.
    * GMTD ScanTech
    * CarCode

  12. #12
    Registered User RNation's Avatar
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    Maybe I'm calling it the wrong part. The air breather that sits on top of the intake, has a hole (I called it a port) where it looks like the silencer would connect into. I don't plug that hole right? It would cut off the air intake.
    84 Suburban 6.2
    3/4 ton
    Rear wheel drive

  13. #13
    Registered User NVW's Avatar
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    My fault, I'm thinking of the silencer on 97 up 6.5's
    Leo
    * 95 GMC 3500 4x4 dually, VIN "F", 4.10 gears, 4L80/E trans, 405,000km, 3" downpipe, 4" exhaust, FSD mounted on heat sink in bumper, #9 resistor, 3 pillar gauge's, High Idle kit, Bosch marine injectors, Bosch Duraterm glow plugs, Leroy's ATT chip, ATT, GP overide, K47 airbox, FTB, Racor fuel filter, fuel pressure gauge
    * 98 Chev. 1500 4x4 VIN "S", 3.73 gears 250,000 km, (needs work)
    * 97 GMC C3500 VIN "F", 4.10 gears, 5 spd manual, 324,000 k (parts)
    * 04 Yukon Denali, 6.0, 196,000 km.
    * GMTD ScanTech
    * CarCode

  14. #14
    Registered User RNation's Avatar
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    So does the open part of the silencer face towards the fan to create a vacuum effect?
    84 Suburban 6.2
    3/4 ton
    Rear wheel drive

  15. #15

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    So you have basically this.



    That port is where the silencer attaches.

    See the U shaped bracket to the left of the air filter housing opening and in front of the A/C box? That's the "hold down" bracket for the silencer. The bottom 1/2 of the bracket bolts to 2 studs on the exhaust manifold.

    Odds are that your CDR isn't functioning at idle due to the lack of the silencer. Try this test. Start the engine with the oil filler cap removed and check your blowby. Then bring the engine just off idle(you can do this from under the hood) and see if the blowby vanishes. That's what mine did. There' wasn't enough vacuum for the CDR to work at idle, but there seemed to be enough for it to work off idle and above. I re-installed it anyways. the engine is so much quieter with the silencer on. Now i just have to listen to the rumble of the exhaust, instead of the exhaust and the ridiculous roar of the intake.

    1996 GMC Sierra SL C2500HD regular cab 6.5L turbo diesel "F" vin Boost and EGT on A-pillar, Heath remote FSD,Heath Max-e-torq GL4, Heath Turbomaster, 3" DP,2.5" crossover, 5" stacks AMSOIL
    85 K-5 Blazer, 379T Detroit Diesel , SM465/NP208 "The Rust Bucket"

    "People should not be afraid of their governments, governments should be afraid of their people." - V

    How can liberals stand up to terrorists, when they can't even stand up to fox news?

    DTR Old School Smokers Club #2

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