Quote:
Originally Posted by cRiPpLe_rOoStEr
Exhaust leaking at the intake during valve overlap is not unheard of.
Valve and injection timing would also need to revert, which is unlikely to happen, unless for some marine engines which have their valvetrain reversible due to some design features.
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I don't think that valve and injection timing are that far off in either direction at idle speeds in a low RPM high torque diesel engine. Of course that would likely change as engine speed increases since the injection timing won't advance but would rather retard ATDC.
I'm sure I reversed the direction of the engine. It sounded different, strongly smelled like exhaust up at the front of the full sized (40ft?) school bus and 1st made it go backwards and R made it go forwards. I shut off the engine and started it again and everything went back to normal.