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Thread: Very Oily Manifold

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    impulsive's Avatar
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    Default Very Oily Manifold

    Pulled my manifold off the other day to discover lots of dried oil in there.. I know the manifold circulates some oil out of the rocker covers, but was wondering how much is too much and if this may be caused by a faulty oil pressure sender, which mind youj has been replaced today.

    Also to eleviate this problem would an oil catch can help at all?
    Life starts at 200km/h

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    catch can will help , check your breaths and hoses for swelling and blockages too .

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    Replace the PCV.

    Yes, a catch can will trap it before it reaches your manifold.

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    Oil fumes get drawn into the inlet manifold from the crankcase via the crankcase ventilation (pcv) system when the engine is under deceleration, ie, when you take your foot off the accellerator , this is normal 4 stroke engine behaviour, these fumes condense into fluid which leaves oily deposit in the manifold. Unless your engine is using oil excessively (worn rings/valve stem seals) then it's normal to have oil film in the inlet manifold. Changing PCV valve wont help this normal event. Changing this valve is usually done when it sticks open & results in erratic idle &/or flat spots in acceleration.

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    the pcv is also moulded into the rhs rocker cover...

    new cover is required... cant just change the pcv

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    Quote Originally Posted by colgf View Post
    Oil fumes get drawn into the inlet manifold from the crankcase via the crankcase ventilation (pcv) system when the engine is under deceleration, ie, when you take your foot off the accellerator , this is normal 4 stroke engine behaviour, these fumes condense into fluid which leaves oily deposit in the manifold. Unless your engine is using oil excessively (worn rings/valve stem seals) then it's normal to have oil film in the inlet manifold. Changing PCV valve wont help this normal event. Changing this valve is usually done when it sticks open & results in erratic idle &/or flat spots in acceleration.
    thankyou !!
    Life starts at 200km/h

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