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Timing...

Jerrylee

Member
Joined
Dec 23, 2006
Messages
24
Location
dolomite,alabama
A few weeks ago I had a rattle when I punched the gas which turned out to be nothing more then a timing issue which was quickley rectified...Now I'm getting the same noise just not as bad......What could cause the timing 2 go out of wack again.....Thanx again....Jerrylee///
 
B

bmotojoe

Guest
Hi Jerrylee,
If you had timing chain deflection you would most likely see it with a timing light on your degree wheel timing marks jumping around erratically. Could be a host of problems here, distributor springs to weak, vacuum diaphragm in the vacuum advance going out. Are you using ported vacuum on your vacuum advance or manifold vacuum? If you’re running ported vacuum then try direct vacuum off the manifold, remember to plug the ported nipple of the carburetor. In most parts of the country there are two types of fuel, summer and winter. Winter fuel is more volatile for easier cold starts and burns quicker. Summer fuel is much slower burning.
Hope this helps,
Brian
 

ruby76

Well-known member
Joined
Jul 12, 2004
Messages
226
Location
Saint Louis (area)- Shiloh, IL
Corvette
1976 Red Coupe, Saint Louis C3 Shark
Sometimes it's the simple things. Make sure you tightened the distributor hold down nut enough.

I agree. I had a 68 chevy truck where the clamp/hold down for the dizzy wouldn't hold position. I had to adjust timing about every couple hundred miles.
 

bossvette

Gone but not forgotten
Joined
May 19, 2003
Messages
3,233
Location
West Unity Ohio
Corvette
1968 1997
in line with the above two posts check the length of the hold down bolt, if it is too long it will "Bottom" giving the illusion of being tight. The proper length of thread engagement is 1.5 times the dia of the bolt or @ 9/16 for a 3/8 bolt
 
Joined
Oct 7, 2006
Messages
295
Location
South Dakota
Corvette
76 Coupe
Very good point bossvet. happened to me once. very frustrating to find the problem. maybe just different grade (lower octane)of gas than last tank.
 

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