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It's supposed to do that.

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โˆ™ 2005-09-19 19:28:38
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Q: Why is there noticeable suction into the crankcase when the dipstick is pulled with the engine running after replacing the intake manifold gasket?
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On A Volvo S60 What is the foam encased part called that is behind the intake manifold and has hoses to the crankcase and head and intake manifold?

The part you are referring to is called a "Flame Trap" - it is part of the positive crankcase ventilation (PCV) system. When it fails it causes too much suction in the crankcase, usually resulting in a nasty squeal or howl at idle that goes away when you remove the oil filler cap. Replacing it requires removing the intake manifold. My dealer quoted $450.00 for the job ($100 for parts and 3 hours labor).


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You can tell when a manifold tuning valve is bad when oil is leaking through it. You also can tell by inserting the dipstick into the valve and seeing if oil comes out through the dipstick.


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Not likely. In fact, the backyard mechanics' test for a blown head gasket is to drip some oil from the dipstick onto the (hot) manifold. If it bubbles, there's water in the crankcase. Another sign is white smoke in the exhaust.


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The PCV valve is located in the camshaft cover,in the crankcase breather chamber or in the hose which connects the crankcase breather chamber to the intake manifold


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What is a PCV valve for?

Positive Crankcase Ventilation Answer 2: The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by scavenging crankcase vapors. It does this by circulating fresh air from the air cleaner through the crankcase, where it mixes with blow-by gases and is then rerouted through a PCV valve to the intake manifold. - Haynes Repair Manual #36071


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If there is oil coming from the exhaust manifold it generally indicates a bad valve stem seal or a worn out engine. (too much crankcase pressure)


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A Pachner move is any of a set of ways of replacing a triangulation of a piecewise linear manifold by a different triangulation of a homoeomorphic manifold.


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Possibly a hose is broken or disconnected on the crankcase ventilation system?Intake Manifold?


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