Club 80-90 Forums

when having the van running i noticed there was a fair bit of slack on the waterpump belt having switched off i cant feel any movent on the pulleys the size on the belt says 10x643 is it just age that has stretched the belt its a 86 1.6td jx. the alternator belt feels ok im going to be changing the waterpump before it gets on the road just would like to get it right and not breakdown on first outing lol

just found a smaller belt on brickwerks as a 10x600 but its listed as a aux belt but says its for the 2 belt type looks like it has the wrong belt fitted looks like an easy fix

The 600 belt that your looking at may be too short, and if fitted will be to tight and damage the bearings. Fit the right size belt and then adjust it correctly and you wont have any problems. I`ll try to have a look in the Bentley later and find the correct sizes.

the 600mm belt is for the alternator i think the waterpump is a 643mm or something like that, i`ll check gsf coz thats where i got mine from.

I've checked vw heritage and it states 10x643 (which I fitted successfully to my jx) I got mine from gsf though and 10x600 for alternator.
Always fit the same size as you remove if they're slipping they're worn, belts can be adjusted on the waterpump by removing or adding the shims (washers) on the two halves of the pulley (it splits in two once the 3 bolts are removed)
Hope this helps

hi yeah it has a 643 belt fitted but it is very slack i didnt know there was any adjustment on the water pump just on the alternator it does state the 643 belt for my year which is 86 i will be putting new water pump on aswell so will do altogether thanks for the info

I changed all my belts inc timing belt (dont forget the tensioner as these fail) together. Timing belt should turn no more than 90 degrees at its loosest point. I changed mine whilst I had the rear valance removed for more access and it was rotten.
I have an 86 jx too that I've been working on for 4 yrs. It still looks a mess, roll on summer!

i too will be doing the timing belt it was done about four years ago but has only done 1000 mile since but i just want to make sure its done i was looking at the locking tools on brickwerks they seem very reasonable was it easy to do? i bought my camper 6 months ago and have been buying all the bits what it needed im itching to get going on it proper now though esp when i see all the threads of other members doing theirs

It wasn`t a bad job to do, easier if you remove exhaust and heat shield (if yours still has one, mine was rotten and held up with wire)
The only problem I had is the 4 Allen bolts that hold the crankshaft pulley on were rounded off, I removed the whole pulley and timing gear (I wouldn`t suggest doing it this way as it was very hard to replace at the correct place).

Keep us posted with your progress and share pictures, we`ve all either been there and don it or still going through the same progress. Have you discovered where Vw have hidden the rust???