crashandburn
1/2 ton status
I'm working on a 98 S10 pickup, had a spun bearing. I flipped the motor over and did a basic bottom end rebuild. Crank, bearings, oil pump. I've done probably half a dozen like this, and the lifters always make noise at first. I'm guessing all the leftover crap from worn out bearings clogs them up. A can of Valve Medic has always fixed them up in a matter of minutes.
This one still makes noise, and I've run it a bunch. It sounds exactly like a lifter, but here is where it gets weird... It really only does it under load. In neutral you can rev it to the moon and not hear it. Put it in gear and go, and there it is. Coast at higher rpm and it's gone. I've already replaced the exhaust manifold gaskets, sometimes that can have a metallic sound. I made sure the flex plate was in good shape while the motor was out.
It doesn't make sense. The lifters don't care if there is load on the engine. They don't even know if it is under accel or decel. The sound is coming from what seems like the center of the engine. I'm gonna go out there and replace them, but I'm not super confident that this is the problem.
Any thoughts?
This one still makes noise, and I've run it a bunch. It sounds exactly like a lifter, but here is where it gets weird... It really only does it under load. In neutral you can rev it to the moon and not hear it. Put it in gear and go, and there it is. Coast at higher rpm and it's gone. I've already replaced the exhaust manifold gaskets, sometimes that can have a metallic sound. I made sure the flex plate was in good shape while the motor was out.
It doesn't make sense. The lifters don't care if there is load on the engine. They don't even know if it is under accel or decel. The sound is coming from what seems like the center of the engine. I'm gonna go out there and replace them, but I'm not super confident that this is the problem.
Any thoughts?
