Hi Guys,

Hopefully someone else can shed some light on this. I'm unsure if the alternator has a clutch pulley (I don't think it does, so this kinda rules this out).

I changed the tensioner because the old one was kaput! I put the new one on, started it up and it's shaking backwards and forwards about an inch. The belt seems to be slapping itself onto the crank pulley quite a bit.

I checked the pulleys for play, the belt is in the correct position on all the pulleys (belt is only about 6 months old too). There doesn't appear to be any play in any of the bearings, so I'm wondering what the hell is causing this slapping.

(I don't have the viscous fan on either, but that shouldn't cause an issue)

Any ideas?

possibly the wrong belt

The crank pulley is a two part item with a rubber cushion. Has that failed? Is it wobbling when the engine's running?

camy1960 said:

possibly the wrong belt

Click to expand...

Belt is correct.

Feathers McGraw said:

The crank pulley is a two part item with a rubber cushion. Has that failed? Is it wobbling when the engine's running?

Click to expand...

The pulley isn't wobbling when running. However, the crank pulley itself does move slightly when I slacken the belt off? I put a pry bar between the pulley and the thing on the end of the pulley and the pulley does move slightly. Is it meant to or not? (I'm assuming not, but this appears to be some form of dampening mechanism?)

I noticed a small knocking noise when idling (which is the only time the tensioner seems to shake, raising engine speed anywhere above idle it sits perfectly still). I'm taking a stab and guessing it could be the dual-mass flywheel on it's way out. I'd assume this could cause this issue also?

Have a read of this
http://www.discovery2.co.uk/CrankPulley.html
Griff