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Timing after head install

Posted: Thu Sep 16, 2021 4:20 pm
by tedfeast
Hello once again!
Rounding the corner on finishing head gaskets on my gl1100.
Getting ready to put belts back on.
So, if I understand this correctly:
I've set the pistons 90 degrees down as to not interfere with valves,
Cams and cradles in place, I should put belts back on as if it was a normal belt replacement EXCEPT for setting TDC.
I should adjust pulleys to their proper marks, install belts, then set TDC afterwards, then do my valve adjustment? Do I have this correct?
Please advise.
Anyway, thanks in advance !

Re: Timing after head install

Posted: Thu Sep 16, 2021 5:51 pm
by Lucien Harpress
Not quite (from what I gather). You're good up until right after bolting the cams in.

Right after the cams are on and set as close to their marks as possible (the right one will be slightly off due to valve spring pressure, this is fine), rotate the crank back the 90 degrees to TDC. You won't hit anything so long as you just rotate it back.

THEN put your belts on, being sure to rotate the right cam (against spring pressure) to line up the marks when that belt goes on. Make sure the idlers are loose, but they don't have to come off at any point. The springs will naturally set belt tension, but don't try to spin the motor over from TDC without tightening them first.

Re: Timing after head install

Posted: Fri Sep 17, 2021 7:23 am
by redglbx
I back the valve adjusters fully off when doing any of this like belts or head gaskets just to help minimize possible piston to valve interference. Once I’m sure all the timing marks are good then I’ll set the valve lash.