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Oil leak in filter and one side of engine

Haydnod

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Hey guys. Need help.
I have oil leaking on my crewman on the left hand side top of the engine right below the intake manifold and it drips on to my exhaust manifold causing smoke.
When pulling the intake off I realised there was also oil in the air filter hose to the throttle body but no oil in the throttle body.

Why is there oil in my filter hose and oil leaking from only one side of the engine?

Is it a crank shaft pressure build up?
If so is it worth me fixing it or mechanic job?

Cheers
 

Sabbath'

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Oil in the intake piping is pretty common on Alloytec motors. Oil from under the manifold, is it coming from a rocker cover or the oil filter housing?
 

Haydnod

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Oil in the intake piping is pretty common on Alloytec motors. Oil from under the manifold, is it coming from a rocker cover or the oil filter housing?
It's coming from the left side just below the intake manifold. It drops onto my exhaust manifold causing smoke
 

Haydnod

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I thought it may have been just a intake gasket leak.
Could it be a crank shaft pressure build up causing it to blow back?
 
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