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Oil is coming out from behind the timing belt cover....possible causes? 200

posted by  Kyle245 on  Wed Oct 2 06:11 CST 2002
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last visit: Thu Jul 10 04:45 CST 2014
[RELATED]

Hello Fellow Brickers.
I opened the hood on my 85 245 w/162K mi. yesterday and was amazed to see that oil had come out from behind the timing belt cover on the right side of the engine and was leaking on the #1 cylinder exhaust manifold port. It looked like a lot of oil came out and even blew back to the firewall. The leak seems intermitten because the engine has had absolutely no leaks after I had replaced the flame trap at 130K. When I run the engine I don't see any oil coming out but it seemed to leak a lot at some point.

My question: What could be the problem and why would it leak intermittenly?
What seals are behind the timing belt cover near where the head attaches to the block?

Thanks in advance.
Kyle 245 162K and 23MPG in the city








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    Oil is coming out from behind the timing belt cover....possible causes? 200

    posted by  nebulous1 on  Wed Oct 2 09:04 CST 2002
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    last visit: Sat Feb 16 20:51 CST 2008
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    My 84 is leaking from every front (brand new) and rear (old) seal on the car. I don't see what the problem is. I just keep adding oil. My pcv system is 100% clear. I even opened the breather box to clean it out and replaced the tube that goes down into the block. I still have excessive pressure inside the crank case. I can't figure it out. I'm not burning oil, so I don't think its a ring problem. Anyway, I agree with Don, the front main seals are probably going.
    Good Luck
    --
    Ben








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    Oil is coming out from behind the timing belt cover....possible causes? 200

    posted by  Jim Holst on  Wed Oct 2 08:30 CST 2002
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    In addition to Mr. Foster's suggestions, you should check the cam cover gasket. This was leaking on our'84 right where the timing belt meets the front of the head. Even a Volvo specialist thiught it was the cam shaft seal. When I opened the t-belt cover to change the t-belt, I found the cover gasket, not the seal was the problem.








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    Oil is coming out from behind the timing belt cover....possible causes? 200

    posted by  Don Foster on  Wed Oct 2 06:34 CST 2002
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    Guess #1 -- bad cam seal.

    Guess #2 -- plugged up PVC system (flame trap, et. al). Excessive crankcase pressure can build and push oil past weak (but working) seals. Look also for a dripping rear main seal.

    If your '85 is a non-turbo, then it has the B230F with the big plug in the back of the head. Be aware that excessive crankcase pressure can eventually pop that seal outto the head. And then you'll have a substantial leak. (BTDT in my '86.) You can feel for this by simply reaching behind the head. You can also fabricate (for $0) and install (for the price of two cheap bolts) a simple retaining strap to secure the plug.

    Also behind the belt cover is the intermediate shaft seal (identical to the cam seal) and the front main engine seal at the crank. It's often good practice to replace all three seals at the time you replace the t-belt. 150k miles would be the perfect interval for a belt, 3 seals, tensioner, and maybe a water pump. (Belt interval is 50k miles.)
    --
    Don Foster (near Cape Cod, MA)







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