s54 engine noise after rebuild

[Nicholas1996]

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.

Interesting. Definitely worth checking thought. Everything timing wise is new. As is the oil pump. I’m going to update post #5 with everything changed

[Ruley]

Was the oil pump sprocket put on right? It's offset. If I recall correctly someone on M3forum put it on backwards and it rubbed.

[Nicholas1996]

i believe so. it was the only way the chain would line up for it

[Ruley]

i believe so. it was the only way the chain would line up for it

Just shooting some thoughts out. Hopefully when it gets opened up and the noise/issue found it's easy to resolve. Good luck

[Mspir3d]

That's scary af. It doesn't sound like it's in the bottom end though.

[Nicholas1996]

That's scary af. It doesn't sound like it's in the bottom end though.

All valves are within spec. Re checked the last night. One thing I did find I think the vanos is making noise. I bought a “lightly used” unit. The hub is good. But i think the oil pump disk is a little worn. The holes measured 10.6 mm. I put the engine back on a stand and started working on it there. Honestly I think the shiny bits in the oil is the ring getting seated. There’s no chunks or anything.

[Mspir3d]

Figure this out yet?

[Nicholas1996]

Figure this out yet?

I believe it’s the vanos hub. I need to get it back in the car and verify. Hopefully soon

[chicane]

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

This ^^^.

Do not start that John Deere again until you tear town. It sounds like the valves are hitting the pistons.

[Nicholas1996]

This ^^^.

Do not start that John Deere again until you tear town. It sounds like the valves are hitting the pistons.

Nothing feels stiff or anything when you the motor over. Plus everything was timed correctly. We will see though!!