Well my rebuild is up to the cam timing now...everything has gone together nice and neat so far. But now I have a dilemma. If I had the factory tools it would not be a problem...its how much to preload the chain ramps to get the timing right?
I have made up a tool out of an old brake piston tool to preload the chain/ramp...works like a champ but I am not sure how much pressure to put on the ramps. I notice a significant movement on my dial guage if I adjust the tool...I can get the swing to be 0.3mm and more. Since I am after a +-0.1 mm accuracy it makes it really difficult to say how much pressure is correct.
I know the amount of chain tension is a common question and I have read all the posts from a search but this 964/993 ramp system seems to have made it much more sensitive.
Can anyone give advice on how much pressure or how long the distance should be between the ramp and the top of the tensioner holdown? If anyone has the factory tools then that can be measured....
Since the right and left sides are different lengths it also makes it difficult to judge the pressure.
The index mark on the pully is about a mile wide as well...I have been using the middle as the true spot but since the timing is on a steep part of the cam the difference between the beginning and the end of the timing mark is over 0.1mm!
I am trying to set the cams at 1.1mm (taking the average between jerry woods at 1.0mm and camgrinder at 1.2mm). ANy comments?
Oh, here is a pict of my mickeymouse chain tensioner:
Thanks in advance!
Cheers,
Mike