BRM Cam replacement

[chittychittybangbang]

Originally Posted by Bambur

I've heard the old timing belt cannot be reused and put back on after taking it off and needs to be replaced with a new one always. What do you think?

As long as it's not unusually stressed and put back in the same direction of rotation, you can. The manual says you can too.

[Bambur]

Originally Posted by chittychittybangbang

As long as it's not unusually stressed and put back in the same direction of rotation, you can. The manual says you can too.

How about the belt elongatining with time? As I see, it might be risky to put such an elongated belt back and tighten it following the original procedure, since the elongated belt tension will be lower than it should, and consequently the cam- and crankshaft might go off sync. Please correct me if I am mistaken.

[chittychittybangbang]

When you tighten the tensioner will take up any slack in a very slightly stretched belt and reset the belt position, the relationship between crank, cam, and other things is also reset.

An old belt will slightly go out of time because of belt stretch as well. It's possible to loosen and reset the belt tensioner but it's best to not disturb it after a long rest because they can get a little sticky. If you loosen it and retighten it, loosen it all the way before tightening it and repeat once or twice to "exercise" the springs in case they are sticking slightly. In addition, you'd have to reset the other timing belt points and it's more trouble than it's worth.

[pmcovell]

I broke the 18mm cam bolt today, did u have trouble getting it out.

[chittychittybangbang]

How the heck did you break the bolt? Pics? It's stuck in the camshaft snub? Did you use the counterhold tools?

[Fernando Mendoza]

How do you know when the CAM is worn?

[kamip]

When the lobes are worn down.