300Tdi throws timing belt - but why?

Gear drive is CRAP.... that is why they dont sell

The main reason the belts fail is poor alignment and not having the correct parts. Has the pump bracket been changed to the later type??? the new kits has a crank pully, Idler, tensioner and bolts..

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Originally Posted by sclarke

Gear drive is CRAP.... that is why they dont sell

The main reason the belts fail is poor alignment and not having the correct parts. Has the pump bracket been changed to the later type??? the new kits has a crank pully, Idler, tensioner and bolts..

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Would gears not produce extraneous noise?? I can imagine that gears, without a proper pressure fed lubrication system and at those high speeds, would produce a hell of a lot of noise.

that looks like it has run over tightened to me OR you have something causing drag on one of the driven (not the crank) gears or idlers.

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Originally Posted by stock

back in 1998 a problem of thes nature arose in new vehicles a recall was put in place and the vehicles were modified with these bits LHH100600/ DRIVE GEAR,LHV100150 IDLER ,LHP100860 TENSIONER. Brit part /bermach do these kits and to the best of my knowledge are the only ones that should be fitted not the earlier type up here on top the kit will cost 300 e . O! ya mind the tension too much breaks em eveytime

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and further to this, the OE crank pulley has a habit of the guide lip failing (it is only spot welded on) whereas the Bearmach one is a one piece construction, and hence more reliable.

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https://www.aulro.com/afvb/images/im...008/01/218.jpg

from here 300 Tdi Timing Belt Question

Too high a belt tension has caused the outer edge of the belt to climb the crankshaft sprocket, it appears to me. I agree with Clarkie, too, that there must have been some misalignment as a result of the overtensioning. The tension on the toothed belt is much smaller than on a V belt.

Sorry about the damage. Hope all is well soon.

Pete

So where can you procure a 1 piece crank pulley and not the spot welded jobby ?

yep.......it looks like it was overtightened.......

when the engine was running........could you hear the belt at all.......?
when they are too tight.......it sounds like the engine is supercharged.....or running a gear drive.......
did you manage to hear anything similar over the diesel knock......?

Rubber has had problems with separation before.

The rubber gets too hot and the ply in the rubber statrs to shrink and then the rubber falls apart ( I have seen this on mine site convayor belts )

But for that to happen the belt needs to be old stock?????


Adam

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Originally Posted by loanrangie

So where can you procure a 1 piece crank pulley and not the spot welded jobby ?

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Bearmach do these kits. My local independent had always fitted the lr kit. When I asked him to get me the Bearmach he was really surprised at what you got. He now orders Bearmach kits for all his cambelt changes.

HTH

Ivan

Overtightening, I have had similar happen on my Duke. Went in for a service and some wad played with the tension for who knows what reason. 20kms out of shop and bang, belts and bent valves. The destruction and shredding of the belt is more due to it getting chewed up by the gear drives. Belts are very sensitive to overtightening.
May have also been a dodgy belt, but unlikely.