Originally Posted by Infinite
coolant doesnt make a knocking sound, nor does the throttle body.
The M112 motors have hydraulic lifters... When they lose oil pressure on shutdown they collapse, causing valvetrain chatter for the last few revolutions of the motor as it spins down. Thats what you are hearing. If it were the fan it would be a constant sound as the fan would be hitting that same point everytime it engaged.........................
I'm with you on this one...
Mine do the same thing, the chatter occurs at the instant I kill the ignition, clutch in or clutch out... doesn't matter. The chatter only starts immediately as the engine shuts off, and lasts less than a second.