Results 1 to 4 of 4

Thread: oil blow by

  1. #1

    Array
    Status
    Offline
    Join Date
    04-15-2011
    Posts
    66
    Location

    American Fork, UT
    Vehicle

    1987 Mitsubishi Montero
    Engine

    Other

    oil blow by

    I have an oil leak that's driving me crazy on my '87 MM with the 2.6. Ever since I switched to the Weber 3236 last November, I have a persistent oil leak coming from the bottom of the bell housing. I won't leak at idle, no matter how long it sits. After about a 15 minute drive, when I stop it drops about a 4" diameter area for about half an hour. I just changed the tranny a week ago and the one year old rear main seal is good. The PCV valve appears to be good. When I take the oil filler cap off at idle, there is pretty good air pressure coming out. The hose at the back of the valve cover that connects to the air cleaner has no pressure or air flow when I disconnect it-shouldn't there be some? Could this be the problem? Crankcase pressure not being relieved through this breather hose, causing oil blow by getting past my rear main seal or am I totally off base here? I'm going to pull the valve cover to check the filter thing under that hose to see why I'm not getting any flow there, but I welcome any input from better minds than mine! ( which is pretty much anyone that can blink and walk at the same time.
    Thanks

  2. #2



    Array
    Status
    Offline
    Join Date
    03-20-2011
    Posts
    4,112
    Location

    Pittsburgh, PA
    Vehicle

    1980 Dodge D-50
    Engine

    G54B
    could be the plug on the back of the head or the valve cover gasket running down the back of the block. Also could be the head gasket leaking oil, but that would be really rare
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  3. #3

    Array
    Status
    Offline
    Join Date
    04-15-2011
    Posts
    66
    Location

    American Fork, UT
    Vehicle

    1987 Mitsubishi Montero
    Engine

    Other
    thanks pennyman. I'm going to pull the cover saturday and scope it out.

  4. #4

    Array
    Status
    Offline
    Join Date
    08-11-2012
    Posts
    1,199
    Location

    Richmond, CA
    Vehicle

    1989 Mitsubishi Mighty Max
    Engine

    G63B
    Steam clean it, isolate the leak.

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •