N62 timing chain

[Bimmer7410]

Originally Posted by andrewwynn

The chain goes in one loop. If off anywhere it's not going to turn. No turn no valve motion. If the valves don't close can't have compression.

The bad news is that I've seen 2-3 M62 that have had chain derailment and always bent valves comes out of it. We pulled four heads from several engines pulled out all the valves that were bent and found some unbent valves and did some swapping to restore one of the motors.

It's easy to set timing and then you can do the compression test to confirm if valves seat or not.

You can use a block of wood as a spacer if your guides are completely gone just for the purpose of getting the chain on to set timing for testing before you bother to replace the guides

Concerning the chain loop: on the N62, there’s supposed to be two chains connected to the crankshaft gear. Popped off on one side doesn’t explain why the other side also has compression, unless I’m missing something.
Also forgot to mention that the chain caused some very fine metal shavings. Haven’t found out if the shavings came from the chain itself or from it hitting the inside of the housing, but we will see.
Agreed with the rest though. I’ll rent the AGA tools and get the timing set, then go from there.