New Cam Belt Slid Off Pulleys

[Pug_XUD_KeenAmateur]

worth a mention this, having finally gotten around to doing my cam belt.

So I've fitted the new belt, removed the locking pins from the pulleys & flywheels
Turned it by hand
Re-fitted the top engine mount and starter to run it and ensure its ok
Turned it on the starter, with the stop switch disconnected
All good so far....

I starts it up, runs it at tickover for a few seconds and within seconds THE BELT'S MAKING ITS WAY SIDEWARDS OFF THE PULLEYS.
THANK GOODNESS I CHECKED AND DIDN'T PUT THE COVERS BACK ON; and that I didnt' rev it!!
I switched off with half a width's belt still in place.

Having a cuppa, before I put the pins back, slacken the tensioner and refit the belt.

[Pug_XUD_KeenAmateur]

later realised, with additional confirmation from Spyder (thankyou) that the issue here was the fact that at this point I'd not refitted the bottom (crankshaft) pulley.
So actually, had I satisfied myself with just turning it by hand, then continued with re-assembly I'd've not had a problem

[Peter.N.]

I was just about to ask that.

Peter

[Oldpug]

So was I. Your a lucky lad Pug XUD as you now know the only thing holding the belt sprocket on the crank is a fully tightened pulley.It should have slid right off and that would have been the end of your cylinder head.
Have you had a very close look at the belt for any damage caused by it hanging half off?

[Pug_XUD_KeenAmateur]

cor, yeah; had a good look and thankfully its fine. The dangers of not having anyone to actually guide you through a job.
Nice to be called a lad, makes me feel almost young again, Birthday soon and I'm old enough to find the idea far from exciting