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cam chain scoring cam cover

F

Forden

Forum Mentor
Past Site Supporter
So I did valve clearances and noticed scoring inside the cam cover from the cam chain on both sides (see pic). I can only assume that the tensioner was not working properly at some point and the chain was loose enough on the sprockets to make contact with the cover.

What I know: the PO told me when reviving the bike, it "made a racket". Someone told him to give the chain tensioner a couple whacks with a hammer to loosen it up (ugh). But it evidently worked and the "racket" was gone.

Any tips for making sure this is not still occurring? Is there something I can coat these grooves with, that will stay put enough (ie, with oil flying around) for me to remove the cover after running and see if the chain is making contact?
Thanks everyone.
IMG_2117.jpg
 
I'd put the engine on 1-4 T (TDC) and remove the cam chain tensioner. Then take it apart, replace the seals, and make sure everything is working smoothly. Even if the tensioner is working smoothly now, at some point it wasn't so a refresh can't hurt.
 
Thanks. I did take it out and grease the pushrod--could not get the lock shaft assembly to loosen, even with it in a vise and appling significant force--I read bwringer's rebuild tutorial, and that said to be wary of forcing it too hard, and leave it alone if it wouldn't budge. So I didn't get to fully refresh it.
 
Above all, make sure you install the tensioner properly. The instructions call for retracting the pushrod and locking it in place, then installing the tensioner. After it is installed, release the pushrod. After the pushrod is released, turn the setscrew in until it touches, then back it out 1/4 to 1/2 turn and lock it in place. That will allow the pushrod to move and do its job. Too many times, the "back it out 1/4 to 1/2 turn" part is not done.
 
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