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Boxer54, Toyota Technician
Category: Toyota
Satisfied Customers: 1755
Experience:  ASE Master tech with L1 certification, Toyota Master Diagnostic Technician
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92 toyota 4runner 4x4 3.0 efi engine. Had HG, had both heads

Customer Question

92 toyota 4runner 4x4 3.0 efi engine. Had blown HG, had both heads cleaned and machinist said it wasn't warped and there was no cracks so it got a valve job. Replaced HG's, using copper spray and silicone sealant. Got it running but it automatically started blown a bunch of thick white smoke out of tail pipe 100% more then before. Emptied engine oil and it was like milke and coffee which was way worse then before HG's were replaced. Situation is way worse then before HG were replaced? Any iseads?
Submitted: 1 year ago.
Category: Toyota
Expert:  Boxer54 replied 1 year ago.

Thank you for trusting us with your questions. How quickly did the smoking begin? immediately? Where, exactly, did you use silicone sealant?

Customer: replied 1 year ago.
Immediately, silicone was used between head and blockwhere HG is.
Expert:  Boxer54 replied 1 year ago.

OK, well, that explains at least 1 problem. You should never use any sealer on a headgasket. Its not needed and could prevent proper torqueing of the head bolts. Not to mention, it likely squeezed some of that sealant into the oil jackets, water jackets, and combustion chambers. This could have some pretty serious consequences. The sealant can plug water passages, but most likely would get caught in the oil pickup screen on bottom of the engine. This can cause oil starvation with disastrous effects. Most likely, the head gaskets are either installed backwards or on the wrong side as well, as this would explain the immediate smoking. Hate to be the bearer of bad news, but your looking at some work here to remove the heads again and install new head gaskets after a thorough cleaning of the block and heads. Remember, use NO sealant of any kind on the head gaskets. I would also recommend removal of the oil pan and a good inspection and cleaning there as well,