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Thread: Series 3 blowing blueish smoke

  1. #1

    Default Series 3 blowing blueish smoke

    Hi, I am looking for some help and insight. I just had my valves adjusted, new carb (Weber), timing set and the truck ran flawlessly for about 500 miles.
    Then one day coming home, I saw that it was blowing blueish white smoke from the exhaust.
    The performance has been about the same. No difference in acceleration or cruising. But a lot of smoke when starting, sitting at a light or stop sign. Burning a little more oil than what I had been, which was none for the first 500 miles.
    I pulled the plugs. All 4 are soaked in oil. All identical.
    Is this a cylinder head issue? I have replaced the diaphragm in the PCV valve. That seemed to have cured the problem briefly. Then it started smoking again on the next drive.
    I have yet to do a compression or leak down test. Are either or both better recommended?
    Thank you all for your help here.
    Dan

  2. #2
    Join Date
    Oct 2014
    Location
    North Carolina
    Posts
    46

    Default

    Dan-

    Have you tried running without your oil-bath air filter? It could be pulling in oil from there. If that's not it, I'd try the compression test to see if you have a ring issue.
    1976 RHD Series 3 - SOLD
    1989 Land Rover 90 LHD
    1940 Piper J3F-50 Cub

  3. #3
    Join Date
    Sep 2010
    Location
    killingworth CT
    Posts
    836

    Default

    Blue means oil. Yes compression check, rings, valves, how is head gasket?

  4. #4

    Default

    Quote Originally Posted by series3109 View Post
    Hi, I am looking for some help and insight. I just had my valves adjusted, new carb (Weber), timing set and the truck ran flawlessly for about 500 miles.
    Then one day coming home, I saw that it was blowing blueish white smoke from the exhaust.
    The performance has been about the same. No difference in acceleration or cruising. But a lot of smoke when starting, sitting at a light or stop sign. Burning a little more oil than what I had been, which was none for the first 500 miles.
    I pulled the plugs. All 4 are soaked in oil. All identical.
    Is this a cylinder head issue? I have replaced the diaphragm in the PCV valve. That seemed to have cured the problem briefly. Then it started smoking again on the next drive.
    I have yet to do a compression or leak down test. Are either or both better recommended?
    Thank you all for your help here.
    Dan
    Curious if you've solved your blue smoke issue... did you find the culprit?

  5. #5

    Default

    Blue smoke, as mentioned, is oil but the "white" part genreally means a water leak....cracked head, leaking head gasket

  6. #6
    Join Date
    Nov 2021
    Location
    Niagara
    Posts
    48

    Default

    Quote Originally Posted by charles1943 View Post
    Blue smoke, as mentioned, is oil but the "white" part generally means a water leak....cracked head, leaking head gasket
    Agreed.

    9 times out of ten it is the valve guide seals. These are easy enough to change. You could replace the head gasket when you have the head off and cover both scenarios.

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