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Ok, so Mark J. and Dennis L. helped me with the saab 99t rebuild bonanza today... Dennis cleaned the engine bay almost by himself, and all three of us got the engine block painted, and prepped for the head. The problem starts here: Where you would normally put a bolt through the center of the cam sprocket to hold it on the stand-off and maintain tension on the chain, there are no threads. In fact, the hole in the sprocket is machined out larger, because it fits over the end of the camshaft! the face on every other b-motor cam is flat where it meets the sprocket, but mine slides neatly into the center hole of the sprocket. I know the engine is a late b-motor, somewhere around 80 or 81, and possible from a 900 originally. So, I know that description was bad and a little hard to follow, but that is not really the problem. The tensioner is what is holding me up here. It SHOULD take up any slack in the chain, and that is why saab provided the stand-off: So you could keep tension on the chain, without having to remove the timing cover to reset the tensioner. i.e. you could pull the head with the engine in the car. Well, to get the head off with my cam/sprocket weirdness, you have to let the chain slacken some. I talked to the guy who rebuilt the motor 50k ago, and he didnt recall any tensioners that you had to reset, or the strange cam protrusion. He said if you can get the sprocket on the cam, why worry? well, ok makes sense: If the tensioner is some newer style (remember this is a late b-motor) that doesnt ratchet out and require resetting, then I am fine, right? Well, ok, but I got the head on tonight, and the timing chain is really loose. All of the timing marks are dead on, but there is an inch of play on the top of the chain! This cannot be right, and I know it can't just be that the guides have been bent. the guides look really good anyway.
So. Does anyone know of a later style tensioner/cam/cam sprocket? Is this tensioner going to auto adjust somehow? Is there some reset? or do I have to pull the head back off and pull that damn timing cover to get to the thing? It was tight when I took the head off, but there was no spring action: the chain never retracted or anything like that. Somewhere it has gained an inch though. I can move the flywheel like twenty degrees in either direction before it tightens the chain to move the cam. When I do turn it tight ("anti"-clockwise), everything is at TDC like it should be. Is this making any sense? What do I do now? Argh! My transmission is finished finally, too! So close!
Any help or opinions would be appreciated.
Regards,
Craig Richmond
Seattle, WA
posted by 165.121.38...
, Mon, 17 Mar 2003 07:52:28
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