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Smoking exhaust

Discussion in 'Engine & Transmission' started by Dominic Molluso, Apr 25, 2019.

  1. Dominic Molluso

    Dominic Molluso Member

    Messages:
    29
    Location:
    Moama
    Hi everyone,

    I'm a new member looking for some advise please.

    I just returned from a trip(about 150km) in my 2 lt 74 Bay kombi and stopped at some road works when she started smoking really badly out the exhaust, it seemed like white smoke.
    I managed to tow it home as not to do any further damage and did a compression test which was ok.
    I then removed the exhaust and noticed some black oil looking residue in the silencer coming from the right side and it all looked tidy inside the rocker cover.
    I started it up with the exhaust off and there was no more smoke.

    I did find the carbi leaking a bit on that same side.

    Anyone have any idea what my problem is please

    Thanks
    Dominic
     
  2. Mr Beckstar

    Mr Beckstar Well-Known Member

    Messages:
    1,043
    Location:
    Bateau Bay, NSW
    What pressures did you get on the compression test? Did you do it cold or hot?
     
  3. Mr Beckstar

    Mr Beckstar Well-Known Member

    Messages:
    1,043
    Location:
    Bateau Bay, NSW
    Also, fix the leaky carby before driving again. Best not to invite a fire
     
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  4. Dominic Molluso

    Dominic Molluso Member

    Messages:
    29
    Location:
    Moama
    Compression tests 87 to 96
     
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  5. Mr Beckstar

    Mr Beckstar Well-Known Member

    Messages:
    1,043
    Location:
    Bateau Bay, NSW
    That 87 is borderline and the 9 PSI difference is not the best either. Do a leak down test to find whether it’s leaking through valves or cylinders/rings.

    Did the smoke you saw come out after a long period where you were backed off the throttle? Perhaps a downhill section? That would likely indicate oil being sucked down worn valve guides and could be a symptom of other problems with the head/valves.
     
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  6. Mellow Yellow 74

    Mellow Yellow 74 Active Member

    Messages:
    845
    Location:
    Sydney
    White smoke can be caused by burning brake fluid if the booster is leaking
     
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  7. Dominic Molluso

    Dominic Molluso Member

    Messages:
    29
    Location:
    Moama
    I did the comp test cold Mr Beckstar
    The smoke was noticeably as soon as I stopped, flat roads no hills.
    I did find some oily moisture in the silencer which seems to be the reason for it smoking, just not sure where it came from.
     
  8. David H

    David H Well-Known Member

    Messages:
    4,988
    Location:
    newcastle
    That's a lot low:( but will still run.
    If "in the silencer" as "in the muffler" you have a problem:eek:. The only way oil can get to inside muffler is from the inside of the engine:oops:.
    Time to think of a top end rebuild Dominic:mad::oops::rolleyes:. Barrel liners, pistons/rings & head overhaul.
    Adding what is your oil consumption for the drive you took? Seems like it ended up in your muffler to burn white. Nice hot temp makes oil burn white....mostly black unless furnace involved:oops:.

    Not saying Cheers
     
    Last edited: Apr 25, 2019
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  9. Dominic Molluso

    Dominic Molluso Member

    Messages:
    29
    Location:
    Moama
    If it were the brake booster leaking would that make its way into the exhaust ?
     
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  10. Mellow Yellow 74

    Mellow Yellow 74 Active Member

    Messages:
    845
    Location:
    Sydney
    The brake booster uses manifold vacuum so if there is a leak in the master cylinder and the booster diaphragm is damaged, brake fluid will end up in the inlet and be burned and come out the exhaust as white smoke.
     
  11. Dominic Molluso

    Dominic Molluso Member

    Messages:
    29
    Location:
    Moama
    If this were the case would it leave oil residue in the exhaust?
     
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  12. Alpal

    Alpal Moderator Staff Member

    Messages:
    8,503
    Location:
    Melbourne Bend of Islands
    Any noises?
    Check oil level?
    Fix fuel leak a must.
    Start and see what smoke is coming out now?
    Is the engine clean or generally oily?
     
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  13. Dominic Molluso

    Dominic Molluso Member

    Messages:
    29
    Location:
    Moama
    I
    Is it possible to check the master cylinder and booster diaphragm?
    I did remove the lines from the manifold and there seems to be a little oil residue present
    Cheers
    Dominic
     
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  14. David H

    David H Well-Known Member

    Messages:
    4,988
    Location:
    newcastle
    To narrow things easily Dominic;).
    If it's brake fluid that container under drivers front seat will have less fluid in it & your brakes be hard to use:oops:. If it's the engine it will have less fluid in it.
    Taste the oil....brake fluid is bitter...engine oil isn't:rolleyes:. mmmm!
    Cheers
     
    Last edited: Apr 26, 2019
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  15. Grantus

    Grantus Well-Known Member

    Messages:
    15,859
    Location:
    Southern ACT
    If it was water cooled, I’d be suggesting a coolant leak at the head, to cause the white smoke..... but obviously a straight rule out, in this case.

    And coolant taste is sweet........ for those of us who identify leakages, by tasting them. :oops:
     
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  16. David H

    David H Well-Known Member

    Messages:
    4,988
    Location:
    newcastle
    No reply is my firm response;).
    Cheers
     
  17. Grantus

    Grantus Well-Known Member

    Messages:
    15,859
    Location:
    Southern ACT
    I didn’t know brake fluid was bitter, until your post! :eek:

    (Obviously, I’ve never had a brake fluid leak.......)
     
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  18. David H

    David H Well-Known Member

    Messages:
    4,988
    Location:
    newcastle
    Can't remember that I have but fluids leak & you've got to know where from;). Had a mate helping me empty mums place recently with his Landcruiser:( & trailer whilst there was light rain. We saw the oil leak on my drive & it's rainbow colour pattern with the amount (none really) of rain. Before I tasted it I said it's hyd fluid as the rainbow pattern was wide. It was bitter & was the power steering pump leaking.
    Talk about a thread hijack:(.
    Cheers
     
    Last edited: Apr 27, 2019
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  19. Grantus

    Grantus Well-Known Member

    Messages:
    15,859
    Location:
    Southern ACT
    No hijack.....all helpful info to identify, which fluid is causing the exhaust to smoke. ;)
     
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  20. Dominic Molluso

    Dominic Molluso Member

    Messages:
    29
    Location:
    Moama
    Interesting as the smoke first appeared when I hit the brakes at the road works..

    I’m going to ask my wife to do the taste test on the oil today. It’s not toxic is it?
     

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