Hi all, completed a timing belt change on an M40B16 today
All went well but I've ended up with this whine, see video. Thinking it may be an overtightened cam belt?
Re: Whine after timing belt change M40
Posted: Sun May 16, 2021 10:00 pm
by paultv
I'd check two things...is the belt correctly centered...I had an instance where the belt was touching the alloy cover creating a whine....turned out to be a worn idler pully allowing the belt to wander ....
Also sounds a bit like a locked viscous fan....
My reference is only to my own M20 rather than M40.
Paul
Re: Whine after timing belt change M40
Posted: Mon May 17, 2021 1:24 am
by twright
is the fan rubbing on the fan shroud?
Re: Whine after timing belt change M40
Posted: Mon May 17, 2021 9:52 am
by nickjf20
Noise remains after removing the fan/shroud and accessory belts.
Retensioned the belt twice as well, no real change.
One of the (new) idler pulleys looks slightly off centre so I've ordered another timing kit ... hopefully it's that.
Fourth time lucky eh? At least I can tear down the front end in 40 minutes now
