i have a late LET with the auto tensioner and plastic pulleys, and the engine is in my nova. ive done a search on here re cambelt changes and ive got a few qu's.
the bottom pulley was removed so that the new belt could be fitted (water pump changed also), but i read on here that the tensioner needs to be moved round to the 'new belt position'-how is this determined, ie is there physical markings on the backing plate which need lining up?
any help on how to setup this tensioner wil be greatly appreciated!
> tensioner needs to be moved round to the 'new belt position'
when you get the tensioner, there is a piece of metal which sticks out the back of it, there is a notch (V grove) No1 cut into it. This is 'old, worn' marking. On my after marekt tensioner there was also another marking (No2), this is the 'new belt' marking. So fit the belt, do up the tensioner to No2 marking. When your running the engine, the tensioner pointer will proably point to No1 postion. When I was fitting mine, no matter how much I done it up at No2 position, as soon as I tuned the crank round by hand, the pointer moved to No1 postion Thats how I left mine. So long as it stays inbetwene these 2 markings you should have no problems.
The centre bolt that hold it on, loosen it, then get an allen key, I think its a 6mm one is used to adjust the pulley, rotate it half a turn anticlockwise.
Remove old belt
Check all pulleys for roughness and play in the bearings
Install new belt
Tension the pulley with the 6mm allen key and turn it clockwise slowly, you will see two arms above the pulley, one in front of the other, the one in front will move directly in front of the one behind, when in position tighten the main bolt up tight.
There is a spring that maintains the correct tension for the belt. Which is nice.
k thanks, i understand how the tensioner works now.
im struggling getting the belt on correctly now!
ive got the bottom pulley timing mark lined up correctly, as are the cam marks, but whenever i get the belt over the last cam sprocket there is excess slack between the two cam sprockets!these things do my head in!
you can buy a cam sprocket locking bit, basicaly a bit of metal or plastic that fits inbetween the two sprockets and stops them spinning. I done mine up on an engine stand as it was out of the car, much easier. I found that I had to purposly have the cam sprockets a few teeth anticlockwise, so when the belt was finaly fitted and tensioned up, the sprockets moved and lined up into place.