Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks

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HEI HELP #77652 01/29/02 02:43 AM
Joined: Jan 2002 Posts: 1 kalama wa timruger1 OP Grease Monkey
OP timruger1 Grease Monkey Joined: Jan 2002 Posts: 1 kalama wa	Does anyone know what would cause my timing mark to be bouncing around? The truck is 77 crew cab dually with a 69 396 motor with a HEI distributor

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Re: HEI HELP #77653 02/03/02 09:44 AM
Joined: Dec 2001 Posts: 279 See the USA in your Chevrolet bowtieollie Backyard Mechanic
bowtieollie Backyard Mechanic Joined: Dec 2001 Posts: 279 See the USA in your Chevrolet	Hi Tim, There are two things that can cause this. 1) - the mechanical advance mechanism needs some attention in the HEI. 2) - the timing chain is shot! Better take care of this, otherwise it will let go and can cause somes fairly nasty damage. Also, the outer ring of the harmonic balancer may be loose - causing the mark to "move". This would not appear as erratic movement however, more slowly, the mark would move around the dampner. Oliver J. Giorgi Technical Advisor 1958 Passenger Car

Re: HEI HELP #77654 02/25/02 12:36 AM
Joined: Feb 2002 Posts: 4 Ct phat Grease Monkey
phat Grease Monkey Joined: Feb 2002 Posts: 4 Ct	Also the most simple the plug wire may be bad. Rock the dampner back and forth and see if you have any slop in the chain. Restored or rodded just drive so people can see the bowtie .Dont hide it away in a garage for no one to injoy.

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