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Nissan_Convert is absolutly right. I saw a guy hose down a hot engine and the exaust mainifold shattered right there...not like glass, but we heard a snap, cracked it. I was saying to him, stay off the exaust...CRACK...too late..
Oil on a manifold will smoke and stink. Check very carefully for oil leaks. Make sure your V/C gasket is not leaking onto the exaust maifold. Won't catch fire but smokes and smells bad. Makes a mess as well.
When toerqueing the camcomver/valvecover, do not overtorque. If you put too much torque on the screws and do not bolt it on in sequence (opposing bolts , corners to middle to others), you will cause a leak due to crushed gasket and warped cover. I think the spec is in INCH pounds, not ft pounds of torque. They are not to be turned down tight, just very snug.
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