timing belt slides off the pulley

[martijn]

hello,

recenlty we 292 camshaft in the X (1978 1300 cc) of my dad, we also mounted a vernierpulley from millers mule. No other modifications were done.

The problem is that the timingbelt is not centered on the camshaft pulley. It slides towards the engine and goes over the edge of the pully and hits the engineblock. Before installing the cam and pulley there were no problems.

Somebody ahs a clue of what we do wrong?

gr
martijn

 

[ng_randolph]

A simmilar problem has been discussed earlier.

Check the second to last post in this thread. I did not see any discussion about cam pulley differences though.

 

[TonyK]

Idler.

Make sure the idler is mounted correctly.

It is possible to have it canted and not square to the belt. It will tension, but keep forcing the belt to walk off it's normal track.

TonyK.

Grimsby Ontario Canada.

 

[Chris Obert]

hello,

recenlty we 292 camshaft in the X (1978 1300 cc) of my dad, we also mounted a vernierpulley from millers mule. No other modifications were done.

The problem is that the timingbelt is not centered on the camshaft pulley. It slides towards the engine and goes over the edge of the pully and hits the engineblock. Before installing the cam and pulley there were no problems.

Somebody ahs a clue of what we do wrong?

gr
martijn

I can confirm it's a common problem, & I solve it by using a pulley with a flange.

 

[carl]

Alignment

Did you remove the cam box to swap cams? Walking belts are usually caused by one of the shafts not being pefectly squared up, any tilt will cause the belt to walk. Most cars now have flangeless pulleys so if all the pulleys and tentioner wheels are perfectly trued the belt will stay in place. If the cam box was removed it may not be sitting square on the head when reinstalled causing the misalignment of the cam wheel.

carl