s54 engine noise after rebuild

[Nicholas1996]

recently rebuilt started knocking on first start up. I did not rebuild the bottom end. Going to pull it out over the weekend and inspect.

[heinzboehmer]

Is that metal in the oil? Something is definitely wrong. I would pull the oil pan and check on the bearings.

[Nicholas1996]

Is that metal in the oil? Something is definitely wrong. I would pull the oil pan and check on the bearings.

Yeah it’s pretty sparkely

[heinzboehmer]

What does "recently rebuilt" mean? What exactly was replaced?

[Nicholas1996]

What does "recently rebuilt" mean? What exactly was replaced?

Rods pistons bearings valve job new valve springs new valve seals. Stock crank. Stock cams.All new seals. New vanos. New chains New guides. New guide bolts. New tensioner.New oil pump.

[Slideways]

It sounds a bit fast for a bottom end issue. Here is a video to compare where I recall the owner forgot to torque down one of the connecting rods -

[heinzboehmer]

It sounds a bit fast for a bottom end issue. Here is a video to compare where I recall the owner forgot to torque down one of the connecting rods -

Yeah I think you're right. Definitely too fast for the bottom end.

OP can you pinpoint where the noise is coming from with a stethoscope? Metal in the oil is definitely concerning, but I'm not sure what it could be coming from besides the bearings.

[Nicholas1996]

It sounds a bit fast for a bottom end issue. Here is a video to compare where I recall the owner forgot to torque down one of the connecting rods -

Engine was idling at 1200 in the video I posted. Would a faster noise mean it’s coming from the head??

[jbfrancis3]

Post #1 doesn't reconcile to components referenced in post #5. Was the bottom end disassembled and all components reused?

Edit: I probably mis-read. You said "I didn't rebuild" and now I assume that means someone else did.

[Nicholas1996]

Post #1 doesn't reconcile to components referenced in post #5. Was the bottom end disassembled and all components reused?

Edit: I probably mis-read. You said "I didn't rebuild" and now I assume that means someone else did.

Yes. It was rebuilt but not by me. Sorry for the consfusion.

[Ruley]

Camshafts turn half the speed of the crankshaft. Kinda sounds like something is rubbing. Cam/timing chain?

[Nicholas1996]

Camshafts turn half the speed of the crankshaft. Kinda sounds like something is rubbing. Cam/timing chain?

Could be. Will note though. Before it actually ran, I was having some starting problems (aem related) and it would run for 2 seconds and . As soon as it fired up even for a second the knock was there.

[beefaroni]

Im curious about the timing chain guides being worn/loose

[Nicholas1996]

Im curious about the timing chain guides being worn/loose

Should’ve clarified. Those are new as well.

[heinzboehmer]

Im curious about the timing chain guides being worn/loose

The bolts holding my driver's side timing chain guide sheared, meaning the guide was completely loose inside the engine. There was definitely a rattle, but it was only really present at about 3000 rpm and sounded very similar to a VANOS rattle. At idle, the car sounded like everything was perfectly fine.