LS1 Engine knock when warm and put into drive or reverse
Thread Starter
Teching In
Joined: Jan 2017
Posts: 1
Likes: 0
LS1 Engine knock when warm and put into drive or reverse This noise is driving me nuts, i have ideas and thoughts that it might be main crank bearing but at the same time im ruling that out. I will start the car everything sounds normal no knocking or ticking, then after 15 min of warm up ill put it in drive and ill hear a knocking noise, i had 2 gm techs look at this and they both said main crank bearing, but i talked to a guy who has been drag racing for 50 years and he said ive never heard of a main crank bearing going, only rod bearings. And if it was a bearing you would hear it on start up, you hear it when put into drive or reverse not in neutral or park. Im planning on pulling the engine this spring but as a sunday toy i like to take it out and enjoy it but this noise has me worried.
TECH Addict
Joined: Mar 2013
Posts: 2,628
Likes: 30
This noise is driving me nuts, i have ideas and thoughts that it might be main crank bearing but at the same time im ruling that out. I will start the car everything sounds normal no knocking or ticking, then after 15 min of warm up ill put it in drive and ill hear a knocking noise, i had 2 gm techs look at this and they both said main crank bearing, but i talked to a guy who has been drag racing for 50 years and he said ive never heard of a main crank bearing going, only rod bearings. And if it was a bearing you would hear it on start up, you hear it when put into drive or reverse not in neutral or park. Im planning on pulling the engine this spring but as a sunday toy i like to take it out and enjoy it but this noise has me worried.
