black_81_vette
Well-known member
Hello I have a cloyes doubble roller chain with the three different keyways for the crank gear.Wich keyway is for strieght up? theres a triangle a rectangle and a dot. Wich one do I use?
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Huh?SG4206 said:It should be the dot. If you line up the "0" on the crank sprocket at 12:00 and the "0" on the cam gear at 6:00 ; you will be timed TDC on #6 cyclinder.
30* ... hmmm ... simply a guess but maybe the new damper/balancer is designed for 1986 & up motor. '68 & back dampers had timing mark 2* to left of keyway centerline. '69 thru '85 dampers had timing mark 10* to left of keyway centerline. '86 thru about '91 or '92 dampers had timing mark 40* to left of keyway centerline. Or maybe the timing tab/indicator is wrong one or located improperly. Cam timing would be pretty far outa whack if you are one tooth off ... rough motor! Suggest back-check damper P/N & application ... also verify that mark is 0* when #1 piston at TDC.Pancho said:OK, now I understand...
I guess since I always set it up 'dot to dot' I assumed that was TDC on #1, but never really paid attention to where the pistons were at the time.
A few weekends ago I changed the cam / lifters / pushrods and timing chain in my '79 L48 (one of the intake lobes was flat). Heads were also removed for guide work. Replaced the harmonic balancer as well (old one slipped). Now that it's all back together it runs great but my indicated timing is something like 30° advanced at idle (vac adv disconnected). I believe I have the correct balancer for my timing indicator... But now am wondering whether I could have the timing chain on one tooth off. (It runs great at both low and high RPMs, though).
/Pancho
SG4206 said:4 degrees advanced and 4 degrees retarded,are the other marks.
You can put the dot on the cam gear at 12:00 and the dot on the crank at 12:00 ; that is TDC #1. This leaves a little more room for error ; like getting everything off 1 tooth.