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| | | | Joined: Sep 2011 Posts: 814 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 814 | Yesterday I was driving my truck and when I put it in 3rd and accelerated I got a loud pop out of the carburetor (I'm pretty sure). I got home and checked the timing to find it's a little bit off--the BB is just to the right of the pointer, which I THINK is advanced.
I set the timing a few weeks ago and it was at TDC. I made sure the engine was warmed up and I had disconnected the line from the vacuum advance and plugged it. I've driven the truck well over a thousand miles without any trouble. The vacuum advance is new, as are the plugs, points, condensor, and dist. cap. I'm pretty sure timing can't change by itself unless the dist. bolt is loose or the gears jump. I haven't checked the bolt yet and the engine is newly manufactured, so I doubt the gears have jumped teeth. If I find that the dist. bolt is tight, does anyone have any ideas about what's happening?
1956 Chevy 3200
| | | | | Joined: Jan 2010 Posts: 4,263 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 4,263 | Check your ...bolt... And the ...clamp... Give it a goose and see if the distributor moves. | | | | | Joined: Dec 2008 Posts: 1,922 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 1,922 | Jumping a tooth never happens in a gear drive. If it moves that far the whole thing disintegrates.
Possible cause: the rubbing block on the points wears down, changing when the points open. | | | | | Joined: Aug 2004 Posts: 1,417 ODSS Lawman | | ODSS Lawman Joined: Aug 2004 Posts: 1,417 | Joe
It is common that the screw holding the dizzy wasnt completely tight and as the vacuum advance twists the cap it can move the timing a little at a time.
SWEET Sergeant At Arms: Old Dominion Stovebolt Society BUNS?!?!?!Where we're going, we don't need no buns.....1950 GMC 450 1951 Chevy 1/2-TonThe GreenMachineIn the Stovebolt Gallery | | | | | Joined: Sep 2011 Posts: 814 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 814 | OK, thanks. I'll check those things. I do see that the tab on the dist. clamp is not in its slot like it's supposed to be--like shown in Dads' picture.
1956 Chevy 3200
| | | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | Same thing happened to me. Screw on the dizzy wasn't tight enough and it jumped time. | | | | | Joined: Apr 2010 Posts: 283 Shop Shark | | Shop Shark Joined: Apr 2010 Posts: 283 | x2 What Panic said about the point gap.
Bob Taylor
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