Question about 1994 Jaguar XJ6

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Oily foam in rocker cover breather pipe

Foamy oil in pipework leading from rocker cover that connects to throttle body, also lots of oil sitting in bottom of the large rubber concertina hose which connects the mass air flow meter to throttle body is this normal? or what is the result of such an accumulation
Car is 1994 xj40 with 230.000km on clock

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  • denisehillis Sep 12, 2009

    There is NO water in the oil at all, there is NO evidence of any foaming in the rocker cover either, in fact there doesn't seem to be any apparent reason for it at all, the coffee colored sludge was present in the pipwork only and the oil present in the bottom of the rubber concertina connecting device just had black oil sitting in it



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Bad news, at best it's a blown head gasket, could also be a cracked head.

Posted on Sep 12, 2009

Testimonial: "since there is NO evidence of water in oil at all the head gasket seems unlikely also head must be ok otherwise water would be evident"

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Bad head gaskets, letting oil and water mix, that is the foamy oil in the pipe from the rocker cover to the throttle body. time for a new head gasket and insure the head is not warped for overheating.

Posted on Sep 12, 2009

Testimonial: "no bubbles at all. compression is ok and even 1 through 6 no water present in oil at all"

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    I was just typing the same comment that tjspear posted. remove the radiator filler cap and watch for bubbles. or with that many miles it may be blow by around the rings on the pistons,up through the valves or guides. anyway you look at it a remanufactured long block is in order.


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If it has been over heated, problem is head gasket... When it's cold, remove the radiator filler cap.... watch for bubbles, and look for heavy sweet smelling exhaust (this is not always typical). You also may just have alot of blowbye oil.... especially considering the mileage... i would recommend a quality remanufactured long block

Posted on Sep 12, 2009

Testimonial: "Compression is fine, no water in oil anywhere in engine,no radiator cap, just filler bottle, no bubbles there either"

  • Tim Spear
    Tim Spear Sep 12, 2009

    it is normal for an engine with alot of blow by... like i told u earlier, i would recommend a remanufatured long block...


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