Beware! 1G4g63t

[niterydr]

Maybe a spun balance shaft bearing?

Hope not as that could cause death to the oiling system. Did you ever see those with your time at Mitsu? Of all the 4g's I've ripped apart, never seen a spun balance bearing, I've seen cooked ones though!

[Super Bleeder!!]

Maybe the sound is timing belt slap? I think my engine makes some noise around that rpm range as well, been that way for years.

[2slow4now]

Hope not as that could cause death to the oiling system. Did you ever see those with your time at Mitsu? Of all the 4g's I've ripped apart, never seen a spun balance bearing, I've seen cooked ones though!

I have seen a 1g with a spun bearing. It was on the oil pump drive side. It made alot of noise and after a clean up and a balance shaft delete it was fine. I just used the short shaft for the pump drive.

[93gtpeater]

I have had the balancer shaft bearing fall out and it would make a rattle noise at 2500 rpms.