stumedic
Contributing Member
My 502 RH rotation has 500 hou
My 502 RH rotation has 500 hours on it now. I bought the engine with 300 hours. Had a knock from day 1. Very hard to describe. Lighter than a rod knock-closer to a piston slap but not quite. Using a stethoscope it's impossible to isolate. Ditto to pulling off ignition wires. Loudest from the timing cover but that's also the thinnest part of the engine. Doesn't seem to be the fuel pump. I give up. If it was something serious wouldn't you think 200 hours would tell the tale? It's there in gear or in neutral and it seems to get quieter over 1500 rpm's. The engine has adjustable hydraulics and they adjusted very easily. Stu
My 502 RH rotation has 500 hours on it now. I bought the engine with 300 hours. Had a knock from day 1. Very hard to describe. Lighter than a rod knock-closer to a piston slap but not quite. Using a stethoscope it's impossible to isolate. Ditto to pulling off ignition wires. Loudest from the timing cover but that's also the thinnest part of the engine. Doesn't seem to be the fuel pump. I give up. If it was something serious wouldn't you think 200 hours would tell the tale? It's there in gear or in neutral and it seems to get quieter over 1500 rpm's. The engine has adjustable hydraulics and they adjusted very easily. Stu