Cylinder Head Looks Steamed Cleaned
#1
Cylinder Head Looks Steamed Cleaned
I bought a motor to replace my current seized motor. Sadly I don't know much about the new motors history so when I removed the valve covers I noticed the passenger side cylinder head has a steamed cleaned look. From there I pulled the oil pan off and noticed some "chocolate milk" in the very bottom. About 1/4 cup of water was in the oil as well. So clearly I have a leak (heads and/or intake). Pulled the heads off but didn't notice any visible signs there that would explain a leak. The head gasket doesn't appear to have any cracks in it. The valve areas in the cylinder heads are not steamed cleaned just the topside where the valve springs and rocker arms are. This is a W series motor supposedly from a Maxima. The engine I am replacing is from an 1986 300ZX A/B motor. I was able to confirm this by finding the stamping on both blocks. I checked the block deck and the cylinder heads and they both look good and within tolerance (.004).
My question is what would cause the topside of the cylinder head to be steamed cleaned but nothing else? Only that I can think of is maybe an intake manifold leak? Should I inspect the crank and rod bearings for excessive scoring due to the coolant in the oil pan? Been using the googlizer a good bit haven't found anything concrete related to my issue.
Just trying to see if anyone else has had this experience and what my next steps should be.
My question is what would cause the topside of the cylinder head to be steamed cleaned but nothing else? Only that I can think of is maybe an intake manifold leak? Should I inspect the crank and rod bearings for excessive scoring due to the coolant in the oil pan? Been using the googlizer a good bit haven't found anything concrete related to my issue.
Just trying to see if anyone else has had this experience and what my next steps should be.
#2
My question is what would cause the topside of the cylinder head to be steamed cleaned but nothing else? Only that I can think of is maybe an intake manifold leak? Should I inspect the crank and rod bearings for excessive scoring due to the coolant in the oil pan? Been using the googlizer a good bit haven't found anything concrete related to my issue.
Just trying to see if anyone else has had this experience and what my next steps should be.
Just trying to see if anyone else has had this experience and what my next steps should be.
#4
Maybe yes, maybe no.
FYI, I had a '93 Maxima GXE with a W-series VG30E. In 2004, it went to college with my son. Needless to say routine maintenance went out the window. First time it overheated on him, one of the cylinders went dead. My mechanic at the time told me the head castings on these engines were prone to cracking between the exhaust and intake valve guides on the middle cylinders of each bank under such conditions. The cylinder lost all compression, but no coolant space was involved. The engine ran surprising well on 5 cylinders. The car never left town after that, but another child at home drove it another 3,000 miles back and forth to school before I sold it. I've since run into other 90's vintage Maxima, Pathfinder and pickup truck owners with a similar experience. Perhaps the top side of the heads were cleaned looking for a crack? Just speculation.
Last edited by ken99; 05-22-2015 at 11:39 AM.
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