The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - What do shot timing gears sound/act like?

OrrieG · 07-04-2010, 02:45 PM

Crank gear runs the camshaft. Camshaft turns the distributor. If you can turn the crank by hand quite a ways one way, then reverse, without the distributor shaft turning you have slop in the gears. That is why it pops, distributor is firing a plug when the intake or exhaust valve opens assuming it is set at correct timing. Same thing happens on v8s when the chain stretches. If it was a broken tooth is would be skipping a tooth each time until a valve hits a piston because the timing is off. Any yes it can go from running to won't start quickly, been there.

07-04-2010, 02:45 PM	#2
OrrieG Registered User Join Date: Jun 2006 Location: Idaho Posts: 8,800	Re: What do shot timing gears sound/act like? Crank gear runs the camshaft. Camshaft turns the distributor. If you can turn the crank by hand quite a ways one way, then reverse, without the distributor shaft turning you have slop in the gears. That is why it pops, distributor is firing a plug when the intake or exhaust valve opens assuming it is set at correct timing. Same thing happens on v8s when the chain stretches. If it was a broken tooth is would be skipping a tooth each time until a valve hits a piston because the timing is off. Any yes it can go from running to won't start quickly, been there. __________________ 1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project Last edited by OrrieG; 07-04-2010 at 02:47 PM.