156 Rocker box Oil Leak - Alfa Romeo Forum
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(Post Link) post #1 of 8 Old 11-05-14 Thread Starter
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156 Rocker box Oil Leak

After replacing the head gasket on my 1.8 I have an oil leak from the rear of the rocker / cambox, adjacent the second camshaft bearing, that pools on the intake manifold then runs down the back of the engine onto the exhaust. (no leak before head gasket changed) I have replaced the rocker gasket twice, the last time using a genuine alfa part and silicone, yet still a oil leak - any ideas ?
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Did you torque the bolts to the right torque? 8-10 nm iirc
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It might be leaking from around the variator solenoid.
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Thanks for the reply and the welcomes , did check the variator solenoid - looked ok, no obvious oil marks passed the o ring - I am now wandering if the problem is high crank case pressure that is forcing out oil around the rocker gasket as the is a distinct 'pop' when I remove the oil filler cap (engine running) I believe this is a known problem, if so, any solutions ?
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There are two breather pipes from the crankcase.

One is the obvious one feeding into the intake pipe just before the throttle ... this one works at low speeds.

But there is a second which is hidden under the engine cover and runs to the intake manifold behind the throttle body and ecu. At the manifold end of that is a spring loaded valve which opens at higher revs ..

Check both are not blocked but having crank case pressure is normal as this is part of the emission controls. You'll find the engine runs badly if you leave the oil filler cap off.

Check for cracks in the plastic cover ... mine's a '98 and starting to get brittle in places ... a piece broke off and dropped into a spark plug hole preventing the plug spanner from fitting ...

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