Lifter or bearing?

[sabersaw31]

Motor has been doing this for some time know. Lost my oil pump. What does this sound like lifter or bearing? Valve springs and prods look good.

[98TransAmWs-6]

Moved to the internal section. I can't listen to the video right now but I'll listen tonight and post my thoughts.

[sabersaw31]

Moved to the internal section. I can't listen to the video right now but I'll listen tonight and post my thoughts.

Okay thanx.

[SMWS6TA]

Starting to sound like when my rod bearings spun.

With it being a 98 and you said you lost the oil pump I'm fairly certain the best case is to pull the motor and check out the rod bearings. If you run it much more you WILL HAVE a much more expensive fix.

Mine started out like that and quickly deteriorated to the point it grenade internally. I spun 3,4,5 main bearings (and yes it's possible), rods 3,5,6,7,8 spun with 7 & 8 cork screwing the rod crank journals. The piston skirt on 7 & 8 were cracked and blew a hole in the block. Had a quarter size aluminum piece playing pinball internally.


All of this because I bounced off the rev limiter twice while doing a burn out because I missed the release on the line lock.

[sabersaw31]

Wow. Yeah it dont sound good. Im going to pull the head and take a peak before i pull the motor.i will push on a couple pistons and see if i got some play.

[98TransAmWs-6]

Okay I listened to it now. It could be a rod bearing like Scott said. I would check the lifters first though. I missed that your oil pump had went out, in that case I would bet heavily on it being a rod bearing.

[sabersaw31]

Yeah i put a new oil pump in just to see if the top end was not getting any oil and the same sound is still there. So it might be a rod bearing. Got plenty of oil pressure know though.

[SMWS6TA]

quickest way would be to lift it up and use a probe on the oil pan and lower block while it's running. If you hear noise on those there's no longer any doubt.

[sabersaw31]

Done started taking apart waiting on rain to get out of here.

[sabersaw31]

Lifter scarred up pretty good looks like it got ahold of the cam lobe.

[sabersaw31]

So i guess i need to pull motor and flush it real good. Try to get all the metal out.

[pajeff02]

Absolutely. That or short block it.

[Firebirdjones]

Eeeuuwww!!! That's ugly. Looks like a roller that was hanging up. I've had roller needles bite the dust before and do exactly that. Camshaft is done. Trash throughout the engine. At a minimum you are looking at a complete tear down to a bare block to have it hot tanked. That crap gets packed in the damndest places that you'll never get out otherwise.

With any luck you won't have scarred up bearings and crank, but if it was run for any length of time I see a rebuild in your future, otherwise that engine won't be long for this world.

[SMWS6TA]

I see you have listed a 98'. Original LS1 and oil pump? How many miles?



I ask because as great as the 98's are their major weakness is the oil pump.

[sabersaw31]

It has 180k on it. Yeah im going to pull the rod and main bearings and see how they look. Prob disassemble and get cleaned even if bearings look good.

[SMWS6TA]

Do it right.....new bearings after a shop checks the rods & crank for wear/damage. Do not reuse bearings eith 180k miles on them. You'll kick yourself later if you do.

A MUST - Replace the oil pump w/ Melling 10295 or LS6 oil pump. I'm willing to bet the oil pump fail or got weak over time and contributed to the other failure. Know 97- 99' LS1 problem.

[sabersaw31]

I got a brand new mellings 10296 setting in garage. Yeah im going to pull it apart and go thru it with new bearings and all. Just lazyness oil pump has been going bad for sometime should of replaced it along time ago and would of been good to go.

[SMWS6TA]

I have it in my block. Talk about an upgrade. @ idle op was @ 60psi.

You need to consider adding a full 6 qrts of oil and maybe a taller oil filter. At high rpms if you have just 5 to 5.5 qrts you can suck the pan dry.

[sabersaw31]

[sabersaw31]

All my bearings look good. My cam bearings is showing some copper.