Distributor help request - Chevelle Tech
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post #1 of 17 (permalink) Old Nov 17th, 19, 11:06 PM Thread Starter
 
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Distributor help request

Have an engine that signs point to being from a 1973 Chevelle. So i thought i’d start here for advice. Distributor number 1112093 with advance weights on top just below the rotor. How do you disassemble this? I can’t figure how to get the weight assembly off to access points, etc below.
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post #2 of 17 (permalink) Old Nov 17th, 19, 11:09 PM
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Re: Distributor help request

The points should be accessible without disassembly of the advance mechanism once the rotor is off. What parts are you trying to service?

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post #3 of 17 (permalink) Old Nov 17th, 19, 11:19 PM
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Re: Distributor help request

I can't speak for cars in 1973 with certainty but trucks didn't get HEI standard until 1975. In 1974 it was optional, I don't think it was an option in 1973.
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69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #4 of 17 (permalink) Old Nov 17th, 19, 11:24 PM
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Re: Distributor help request

Quote:
Originally Posted by Dean View Post
Have you tried removing it's cam gear?
No points on a 73 distributor Tom.
Yes there were, gapped at .019, 75 was the first year of the HEI.

To the OP, you can access the screws that hold the points without removing the springs and weights. I prefer to set the initial gap and fine tune with a dwell meter.
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post #5 of 17 (permalink) Old Nov 17th, 19, 11:25 PM Thread Starter
 
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This is a photo with the rotor removed. Weight assembly is immediately under the rotor.
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post #6 of 17 (permalink) Old Nov 17th, 19, 11:26 PM
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Re: Distributor help request

The part number checks out as a points distributor, also.

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76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #7 of 17 (permalink) Old Nov 17th, 19, 11:38 PM Thread Starter
 
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Can’t figure how to get to the cam, being it is under the weights. Found this parts diagram that depicts the assembly.
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post #8 of 17 (permalink) Old Nov 17th, 19, 11:57 PM
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Re: Distributor help request

Its easier to change the points and the condenser with the distributor removed from the engine. This way you can move the shaft around to gain access to the screws. Mark the rotor position on the side of the distributor, remove the hold down bolt, and pull the distributor from the engine. Do your maint and then reinstall it with the rotor pointing to your mark.

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post #9 of 17 (permalink) Old Nov 17th, 19, 11:57 PM
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Re: Distributor help request

You shouldn't have to do anything with the cam but if you do the distributor has to come out and the roll pin that holds the gear in has to come out. Then the shaft will slide out.
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70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #10 of 17 (permalink) Old Nov 18th, 19, 12:00 AM
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Re: Distributor help request

It's been a long time since I've replaced points but it's not hard to do with the distributor installed. You may have to bump the engine a bit to get to the screws underneath the advance plate.

70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #11 of 17 (permalink) Old Nov 18th, 19, 11:13 AM
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Re: Distributor help request

The distributor in my old 73 Chevelle evidently had been replaced then.

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post #12 of 17 (permalink) Old Nov 18th, 19, 11:41 AM
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Re: Distributor help request

Quote:
Originally Posted by Dean View Post
The distributor in my old 73 Chevelle evidently had been replaced then.
It looks like HEI was optional for Chevelles in 1973. Yours was probably OEM.

70 Camino...Roller

69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt

76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt
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post #13 of 17 (permalink) Old Nov 18th, 19, 6:27 PM
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Re: Distributor help request

NO HEI in 1973, NONE.

Points are easily accessible with the distributor in the engine. Simply rotate the engine until yu can see both points screws past the mechanical advance weights. then unscrew the two hold down screws to allow the points to clear their mountings (no need to remove the screws).

Then, with the points removed from the distributor, push the points spring back to allow the wire(s) to be removed, points end up free and clear of the distributor, in your hand.

Reverse to mount the new points set. Then rotate the engine over until the points are as open as they can be, and set the gap to .016 for restart. After reinstalling the rotor and cap, start the engine and set the dwell through the window on the cap, to 30 degrees of dwell on the 8 cylinder scale.

Yes, it can be a bit intimidating the first time you do this, but, persevere, use common sense, and if you have a problem, go back, think it out, and get it done right.

A couple of things to remember,

NEVER SAND, FILE, DRESS A SET OF POINTS. Points are tungsten coated to help retard burning, which ruins the points faces, sanding, filing removes the tungsten, causing faster points degradation.

NEVER, EVER, EVER use a set if "Uni-Points". These are the ones with the condenser mounted to the points set. ALWAYS opt for the separate points, and condenser, always.
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post #14 of 17 (permalink) Old Nov 18th, 19, 10:36 PM
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Re: Distributor help request

Even though the original poster has a distributor that has a uni-point, he's one of the lucky ones. I have seen some late distributors that weren't drilled and tapped to mount a condenser. This one has the hole already in the breaker plate. When you get a condenser to go with your new points, be sure you get a mounting clamp and a matching screw for the condenser at the same time. Some brands don't furnish those parts with the condenser.
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post #15 of 17 (permalink) Old Nov 19th, 19, 5:49 PM
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Re: Distributor help request

Odd, I am in the ignition system industry, have been for over 45 years, even developed my own HEI conversions for points distributors, including the 1112093 units, I do this stuff for a living, all this time. I even helped develop the large coil in cap HEI's.

I have NEVER seen a stock GM V8 points distributor that did not have a condenser screw threaded hole. These plates also have two raised dimples that correspond to the condenser mounting bracket to stop the condenser friom rotating on its hold down screw, so the condenser doesn't swivel and lock the mechanical advance from the condenser by jamming it into the inner face of the distributor cap.

I have seen three different styles of points plates, none of them didn't have a condenser screw hole. Please, someone show me a GM V8 points plate that doesn't have the condenser threaded hole, and, the two dimples in it, LOVE to see one.

Uni-Point sets weren't developed until about 1980 or so, a clean 6 years after GM stopped making/installing the points distributors.

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