Vertical Play in Distributor - Team Camaro Tech
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post #1 of 6 (permalink) Old May 14th, 04, 02:59 AM Thread Starter
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Mark
 
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How much vertical (up and down) play is acceptable in a distributor? Mine seems to have a good amount, maybe 1/16" of an inch or a little more. I was timing my car with my trusty Craftsman tools which has a tach on it, and every once and a while my RPM's would dip significantly. The timing light would also flash unevenly like it was missing a spark every so often. I'm wondering if it's just my 20 year old equipment or if my distributor is screwed up. The distributor is just a stock GM unit on a 350/300HP L48.

If I have to add some shims, where can I get them?

Mark Canning
1969 Indy Pace Car
350/300HP RPO Z11

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post #2 of 6 (permalink) Old May 14th, 04, 04:57 AM
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Mark;

I usually shim mine to @.015~.020", most factory units are very "loose".
In testing on a distributor machine many years ago I found this helped stabilize dwell readings.
I can't remember who has the shims but can look up the info if you need.

Hope this helps;

John

1968 Convertible
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post #3 of 6 (permalink) Old May 14th, 04, 07:23 AM Thread Starter
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Wow, mine is alot looser than than that, by orders of magnitude. looks like I need to do a bit of shimming

Mark Canning
1969 Indy Pace Car
350/300HP RPO Z11

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post #4 of 6 (permalink) Old May 14th, 04, 07:41 AM
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I always shim them to remove the play. Around .007"-.015" is fine. I get the shims at the speed shop blister pack isle.

The distributors come that way when new from GM. NOBODY has ever offered a decent explanation as to why. [img]graemlins/clonk.gif[/img]

They also forget to tell you about the dimple on the drive gear. It needs to face the direction of the rotor tip in order to index correctly. Just a little assembly tip. [img]graemlins/thumbsup.gif[/img]

-Mark.
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post #5 of 6 (permalink) Old May 14th, 04, 08:29 AM
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Quote:
Originally posted by stingr69:

They also forget to tell you about the dimple on the drive gear. It needs to face the direction of the rotor tip in order to index correctly. Just a little assembly tip. [img]graemlins/thumbsup.gif[/img]

-Mark.
Thanks Mark - forgot to mention that - and while we're at it...
Don't forget to check and 'de-burr' the end of the shaft where it enters the oil pump slot - they can have some nasty burrs here that can effect the smoothness of the pump drive and lead to spark-scatter issues.
Oh - and use a steel collar instead of the plastic one if possible.

And one last thing - use a new roll pin and make sure it is driven in correctly (support the gear) and fully - I have seen more than one sticking out some [img]graemlins/clonk.gif[/img]

John

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post #6 of 6 (permalink) Old May 14th, 04, 04:03 PM
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Well, I know that Jegs sells the shims. That's where I got mine.

http://www.jegs.com/cgi-bin/ncommerc...search=on&ns=Y
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