12.7 Detroit backfires and throws fireballs
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Flipp, Apr 11, 2020.
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Rideandrepair and Shawn2130 Thank this.
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Flipp: problem with the C15 is still unknown. Engine is currently being rebuilt as the head is cracked in 3 places.
It is understandable how frustrating it can be trying to chase down problems and not even the Cat mechanics can find it. The computer says it’s running fine. Even brought a loaded trailer in for the test, drove for over an hour, when the problem shows up, it’s not showing on the Cat Et.
So basically, we are at the throw parts at it stage.
First we will see if the rebuild with a new head fixes the problem.Rideandrepair and 650cat425 Thank this. -
im pretty sure the fact that the timing was off 1 tooth is ur reason, that always causes some sort of damage
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Flipp: any luck so far to solving the issue?
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Rideandrepair and 650cat425 Thank this.
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When mine was overhauled, they found marks on 3 of the pistons from valves hitting. Don’t know for sure if or how bad the valves were bent. It wasn’t visible. They were probably that way for a while though. It ran good, up until I blew an injector, and eventually cracked the head. An Engineer from Detroit said it was probably caused by worn valve guides. Same mechanic found cam gear 1 tooth off on a friends 12.7, after he had bull gear done. Valves were bent, had to replace the head. I’m just guessing that the tolerances are so close, that a bent valve is possible.
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