volvo 2001 oil loss

[Artimes]

What is going on in my crankcase?
first liquid increase over two months..no fule leak into crankcase, no water in oil.
So refill new oil to correct level. One hour run most oil gone. No obvious oil leak but high pressure observed and ejected oil when dip stick removed when engine running.
Any suggestions please

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[boatless]

Not sure what you mean by "first liquid increase".

But, first guesses would be blocked crankcase breather and/or worn piston rings.

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[oldharry]

You have excess crankcase pressure usually caused by blowby, which is what happens when compression escapes past the pistons/rings into the crankcase. If you are lucky its nothing more than a broken ring(s), but most likely it is simply worn rings and bores requiring rebore or at least a new set of rings.

But you might just be very lucky and find the crankcase breather is blocked and simply needs cleaning.



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[brianhumber]

Would agree,
wonder if the increase in oil level was due to incorrect dipping and splashing up the tube.

Sounds a bit of a poorly engine from the desription. Last one I had in this state I advised the owner to strip and investigate before he set off on RTW. He ignored the advice, had a re-ring job down in the Canaries and then had to renew completely as it seized completely going acress the Atlantic.
Se la Ve

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[frilaens]

I have had both the dip stick pop out and also leak due to over-filling and a bad o-ring fit respectively. I have also lost oil quickly at high revs into the cooling water (making the raw water greyish) due to overheating and a deformed head. Curious, but the cooling water never made it the other way into the oil.

Andy

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[oldharry]

<the cooling water never made it the other way into the oil.>

...because the leak in the head gasket would have been around the oil feed to the valve gear in the head, allowing oil at 50psi or thereabouts to leak into coolant which was at around 10psi. If the gasket fails around the push rod or oil return passages, then the coolant will be at higher pressure than the crankcase, allowing it to escape into the oil.


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[martinb]

On the 2001, the breather is a small drilling in the head through to the inlet tract, if this is blocked this will cause pressurisaton of the crankcase and ejection of the oil from the dipstck, as occured on my engine when the rocker cover was slightly mis aligned allowing the gasket to cover the breather hole. A very poor design in my mind, and one I shall modify when I get the chance.

Martin

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[Artimes]

Thanks gentlemen for all this advise, will now investigate futher

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[MidnightStar]

Artimes. Seem I have a similiar problem - see Leaking Volvo Penta engine 29/09/04. My engine is a TAMD74EDC year 2001. What is yours?
Have only done 350 hrs. 80 of these bringing boat to Portugal end August.
What action/conclusion have you taken/come to?
What help have Volvo offered?



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[Artimes]

"midnight star" replied as above. I have followed the wisdom of other replies and last night found that the rocker box gasket had indeed been replaced incorrectly and had blocked off the breather hole. This has been corrected but the engine will not be run until Saturday. If problem has cleared I will report back

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[Artimes]

As I said the rocker box cover was replaced and did block the breather hole to the induction passage. after correction the positive pressure in the crankcase dissapeard completly (dipstick can be taken out whilst running) and there is now no oil loss.
A complete cure thanks to thew wisdom of this forum!

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