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  1. #1
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    Default Need help with oil issue

    Hay all looking for some help with an oil issue Iím having with my boat itís a mid mount 351 Cleveland whatís happening is after running (actually driving) in water for a couple of minutes I seem to get a build up of oil in the rocker covers that then leaks out the breathers and on to the exhaust witch then starts to smoke. This doesnít happen when itís just sitting in idle but starts when in gear. A friend suggested blowby but engine seems to run well and no smoke is coming out exhaust. Motor sits on a bit of an angle but oil comes out at hi breather as well. Has anyone had this issue or know of anything I can do to stop it ?

  2. #2
    Newbie 82Juddcraft's Avatar
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    Quote Originally Posted by Metalman316 View Post
    Hay all looking for some help with an oil issue Iím having with my boat itís a mid mount 351 Cleveland whatís happening is after running (actually driving) in water for a couple of minutes I seem to get a build up of oil in the rocker covers that then leaks out the breathers and on to the exhaust witch then starts to smoke. This doesnít happen when itís just sitting in idle but starts when in gear. A friend suggested blowby but engine seems to run well and no smoke is coming out exhaust. Motor sits on a bit of an angle but oil comes out at hi breather as well. Has anyone had this issue or know of anything I can do to stop it ?
    Mine used to do that a bit, maybe try a catch can.

  3. #3
    Senior Member TonnerGuy's Avatar
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    Default

    Had similiar issues on 2 engines in the past, both were due to the PVC valve blocked, causing undue pressure in the engine at high revs and forcing the oil out of the breathers, one had a wasps nest inside the PVC hose (go figure).

  4. #4
    Do you ever leave? EH179's Avatar
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    Do the rocker covers have baffles underneath, where the breathers exit?

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