cam tensioner nut just spins
03-18-2011 | 05:17 PM
#1
Thread Starter
Instructor
Joined: Mar 2008
Posts: 123
Likes: 0
From: Warrington PA (NE Philly burbs)
cam tensioner nut just spins
I did ran into a problem while tensioning the t belt. While tightening the cam tensioner pulley, the belt was tensioned at about 15lbs. So I tighten the Pulley bolt and a 2-3 turns of the wrench the nut started spinning very easily, and stopped tightening the t-belt. I dont know if the threads are stripped on the nut, or if its te stud that is stripped. The stud does not move with the nut. Can I put another 17mm bolt on there to tighten the belt, and hopefully move the stripped nut far enough to catch again. But, I will need to get this nut off the stud at some point. Try and saw it off?
03-18-2011 | 07:03 PM
#3
Race Car
Joined: Nov 2004
Posts: 3,993
Likes: 3
From: Blue Ridge Mountains NC.
the nut on the tensioner does not tighten the belt. The tensioner itself has a large "nut" shape that has to be held at the correct tension, then the tensioner "nut" is tightened to hold it in place. How do you know 15 pounds is the tension, and if this is, at all, correct tension. These cam belts are looser than you would think when set at spec.
03-18-2011 | 10:53 PM
#4
Thread Starter
Instructor
Joined: Mar 2008
Posts: 123
Likes: 0
From: Warrington PA (NE Philly burbs)
Yes, its an early car, '84 944. I got the nut off, but I did strip the threads of the nut, and the stud. How would I go about fixing the stud? Should I get stud puller and replace, or can I re-thread the stud?
The 15 pounds is just a guess. I watched Vans video on U-tube, and he said the balance shaft belt should be about 1/3 the tightness of the t-belt. The cam belt was a little looser than the balance belt.
Here are pictures of the stripped stud. It is the bolt in the timing belt tensionor pulley the comes out of the block.
http://i1181.photobucket.com/albums/...mbeltbalancebe ltlayout.gif
http://i1181.photobucket.com/albums/...4/IMG_0665.jpg
http://i1181.photobucket.com/albums/...4/IMG_0666.jpg
The 15 pounds is just a guess. I watched Vans video on U-tube, and he said the balance shaft belt should be about 1/3 the tightness of the t-belt. The cam belt was a little looser than the balance belt.
Here are pictures of the stripped stud. It is the bolt in the timing belt tensionor pulley the comes out of the block.
http://i1181.photobucket.com/albums/...mbeltbalancebe ltlayout.gif
http://i1181.photobucket.com/albums/...4/IMG_0665.jpg
http://i1181.photobucket.com/albums/...4/IMG_0666.jpg
03-19-2011 | 01:06 AM
#5
Rennlist Member
Joined: Dec 2008
Posts: 2,238
Likes: 7
From: NM (ABQ)
The stripped nut is the tensioner lock nut. That is it's only function, to lock the tensioner against the block. The tensioner is an eccentric that rotates around the stud.
I can't imagine how the timing belt could end up looser than the BS belt, no matter what procedure you used. If you were tightening the lock nut thinking it would change tension, I can see why it stripped.
I can't imagine how the timing belt could end up looser than the BS belt, no matter what procedure you used. If you were tightening the lock nut thinking it would change tension, I can see why it stripped.
