just put a reman head on my 98 s70 after a failed tensioner caused belt to jump and bent all my intake valves. happened on start up but before engine completely turned over. but now with the reman on and the engine back together trying to turn engine manually the belt keeps jumping. should also say tensioners (mechanical and stationary), water pump, and belts were all changed. when turning crank occasionally the belt grabs causing the mechanical tensioner to come under complete tension and jumps on either the crank or the exhaust cam. any suggestions on what might be going on?

 

Is the crank turning smoothly?

 

Yes the crank is turning smoothly. I am thinking it has something to do with the exhaust cam or the journals ( not sure if that's what they're called. The surface on the head on which the cam rides)

 

The only way a belt can jump is if it doesn't have enough tension on it. So either the new tensioner is bad,its installed incorrectly or something else is worn that is creating a loss of tension.

 

What did you torque the cam cover bolts to?

 

according to specs that were given to me from local auto parts store, i torqued them to 13ftlbs. Is this correct? It was also available through their online repair info. I looked it up to double check.

 

I agree; post a pic of the tensioner/belt area; close up.

 

Ok that is the correct specs for it.
Did you tension the tensioner the correct way? I have seen some people turn it the wrong way and have it cause issues. Some of them have an arrow on them to direct the way it should be turned.

 

it is a mechanical tensioner not the hydraulic type. Isn't the tension pre-set on the mechanical? If not how do you set it.

 

The mechanical one you have to set the tension.

You have to use an allen wrench to turn the tensioner till the tab goes just to the right of the window. Then back off a hair till it is on the middle of the window(2 posts) then tighten the 12 MM nut.