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Old 06-10-2021, 05:04 PM
chrisfuture8 chrisfuture8 is offline
Join Date: Mar 2018
Location: Bay Area, CA
Posts: 42
chrisfuture8 is on a distinguished road
I replaced the belts back in 2018 (summer) when I did a major top overhaul.
Belts installed the way they came out (had diagram drawings of how they were routed).

The tension is tight while the engine is off. Screeching happens only on the first start (when motor is cold). All subsequent starts, it's perfectly fine and quiet.

The idler tensioners are all original and there's about 155K on the clock.

Thanks Andrew for the info. I'm guessing then that the waterpump/alternator belt tensioner is the one to get.


Originally Posted by andrewwynn View Post
Check your level. Wife's e53 would squeal like a pig when cold if the ps fluid was just a little low.

Everything but the AC is driven from the same belt. Unless your tensioner is shot it's very unlikely to slip in the pulley, I've always attributed the sound to something internal but it does sound like a slipping belt.

When you release tension, does the tensioner really snug the belt? It should be very tight.

Also confirm the routing path is correct I have a feeling it might be possible to have more than one solution of how it's wound.
1991 BMW 850ia

2002 BMW X5 4.4
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