2001 V6 oil leak - Nissan Frontier Forum
 
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#1 (permalink) Old 02-12-2011, 11:28 AM
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2001 V6 oil leak

My passenger noticed a burnt oil smell, checked under the hood and I can see smoking behind the passenger side valve cover. The valve cover gasket itself seems to be leaking a little, but the smoke seemed to be coming from deeper down the engine.

My initial worry is rear main seal, but Im wondering if any oil coming from there would even reach the exhaust?

Is a leaking cover gasket common? Truck only has 60K miles or so.

Thanks.

-Chris
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#2 (permalink) Old 02-12-2011, 11:47 AM
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I recently had my valve cover gasket replaced. It leaked on my started and I ended up killing two of them before it was figured out.

I have an '04 with 120k
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#3 (permalink) Old 02-12-2011, 04:54 PM
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the valve cover is probably leaking and the oil is seeping to the exhaust manifold.
Or it could be like my 00 and the front main seal is leaking and the oil is blowing back against the exhaust.

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#4 (permalink) Old 02-13-2011, 04:58 PM
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Took a better look at it today. Its definitely coming from the upper part of the engine, but for some reason there seems to be a lot more oil around the head gasket area than the valve cover area. Could the head gasket be leaking? I havent checked the coolant yet (engine is still hot), but the oil is not milky. Im wondering if maybe the valve cover oil is accumulating on the head gasket and making it look like there is more there.

I noticed a couple of the valve cover screws were a little loose...didnt tighten them too much (service manual warns about possibly warping the head that way), but just thought it odd for some to be tight and some to be a little loose.
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#5 (permalink) Old 02-13-2011, 06:47 PM
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head gasket is possible. the aluminum heads and iron block expand at a different rate as the engine warms up and that causes a small amount of wear each time on the gaskets.

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#6 (permalink) Old 02-13-2011, 10:22 PM
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Yeah, Im just not sure how to tell what the source is.

I checked under the rad cap but didnt see any coolant (the truck has had plenty of time to cool off so that might be normal). Underside of cap didnt show any milkyness, and whats in the overflow is still green coolant.

The truck has never overheated, the needle hovers in the same place all the time (this is assuming the gauge and sender are reading correctly). I think I might work under the assumption that the issue is the valve cover gasket
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