Desperate (Timing chain question) - Page 2 - PeachParts Mercedes-Benz Forum

Mike Michalek · #16 04-22-2006, 11:41 AM

My wife helped with that part. I just don't understand how the cam got so far off. When feeding the chain the camshaft was rotating along with the crankshaft. Except for when I turned the camshaft indepentent to try to align things up, but it wasn't more than a couple of teeth.

Brian Carlton · #17 04-22-2006, 11:43 AM

Quote:

Originally Posted by Mike Michalek

I am at work right now. The mark on the cam is at 9 o'clock so I would have to rotate it about a half a turn. I did keep tension on the chain while feeding the new chain on. The first time I feed the chain I kept the old tensioner in place, but the second time I removed it.

The camshaft cannnot be out by 1/2 turn if the crankshaft and camshaft were both rotating in the process. The valves would have hit the pistons long before the error became this great.

Please rotate the engine (with crankshaft and camshaft both turning) exactly 360 degrees and align the crankshaft with 0 degrees, again, and then post the new relationship between the camshaft marks.

My guess is that you have a camshaft error of 1 tooth.......18° IIRC. The engine will rotate with this error.

Mike Michalek · #18 04-23-2006, 08:01 AM

Brian you nailed it. I rotated the engine 1 turn and it aligns up now. The cam is one tooth off. I am off Monday and will adjust the cam and permently install the chain link. Over the years I have replaced about 3 timing belts with a 5-7 year timeframe in between the changes. Everytime it seems like I have to start the learning curve all over again. I would like to thank everyone for thier prompt replies.

Brian Carlton · #19 04-23-2006, 08:06 AM

Quote:

Originally Posted by Mike Michalek

Brian you nailed it. I rotated the engine 1 turn and it aligns up now. The cam is one tooth off. I am off Monday and will adjust the cam and permently install the chain link. Over the years I have replaced about 3 timing belts with a 5-7 year timeframe in between the changes. Everytime it seems like I have to start the learning curve all over again. I would like to thank everyone for thier prompt replies.

That's excellent. Just be careful when you remove the camshaft sprocket. The cam wants to slide rearward and that thrust washer right behind the sprocket wants to head to China.

You'll surely need to release the tensioner........again.

Mike Michalek · #20 04-23-2006, 08:11 AM

Brian I was just going to lift the chain off of the cam spocket and make the adjustment. Is my thinking correct?

Brian Carlton · #21 04-23-2006, 08:23 AM

Quote:

Originally Posted by Mike Michalek

Brian I was just going to lift the chain off of the cam spocket and make the adjustment. Is my thinking correct?

I don't think you'll have enough clearance between the chain and the teeth........even with the tensioner removed........but, I have not done it.

When the head was removed from the SD, I installed the chain onto the sprocket and then installed the sprocket onto the camshaft.

Mike Michalek · #22 04-23-2006, 08:40 AM

I guess I will try lifting the chain first to see it it works. It seems like it would be a little easier and if not then do it your way. Thanks Again.