Align marks at TDC
Posted October 16, 2006 - 10:17 AM
Firstly, I noticed that when aligning TDC the mark/line on the rotor is a little off (1mm or 2) the mark on the crankcase cover when the punch marks on the camshafts are parallel to the head surface. Is this normal and OK?
Secondly, how accurate does one need to be at TDC when checking valves. is 1 or 2mm from the head surface OK for the punch marks form the cams or does the profiles of the cam lobes already start affecting the clearances at the smallest movement away form TDC?
finally, I accidentally turned the crankshaft clockwise for about 30 degrees. It made a clicking sound like a ratchet. Is this normal, have I damaged anything? Once I rotated counter clockwise everything sounded fine again.
Thanks in advance for the responses
Posted October 16, 2006 - 10:54 AM
Posted October 16, 2006 - 11:26 AM
Posted October 16, 2006 - 11:47 AM
If you're still not sure wait until after the site is upgraded tomorrow and search for posts by me on this subject. I was fixing an auto decomp cam that was installed incorrectly by the dealer. Lots of pics and advise from guys on that thread.
Posted October 16, 2006 - 01:20 PM
I've also always made a point to be sure that the "I" mark lines up exactly, even if I have to hold it there somehow....
Posted October 16, 2006 - 07:52 PM
How much tolerance/degrees in the cam rotation is there before the profile of the lobes changes to affect the clearances at TDC??
Posted October 16, 2006 - 10:01 PM
You need to be at TDC the cams come away quickly.
Hey Indy, what do you mean by that?
It seems that profile of the cam lobes are all round around TDC and do not have elliptical profiles. Am I right?
How many degrees approx. before and after TDC will the cam lobes be concentric until the profile starts to take action to close the clearance and move the valves? Any one got some ideas?
Posted October 17, 2006 - 11:42 AM
Posted October 17, 2006 - 03:51 PM