Quote:
Originally Posted by amaurer
What is it about H pistons that would cause this??
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The amazing thing is that the engine ran well after it warmed up.
I think some skate punk kid in Brisbane had the truck before me. (There was a bunch of skateboarding stickers on the interior walls.) It looks like it was run with a defective thermostat for a long time so the engine never got up to operating temp. I suspect poor oil change habits based on the amount of sludge in the engine.
I've been told that most of the aftermarket pistons for the H series engines have a steel insert in the top compression ring groove to alleviate this common problem. I don't think it's unique to the H. Apparently the 2H and 12HT pistons do the same thing. It must be the stock alloy that Toyota uses.