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Re: Removing Distributor Gear [Re: ClassicsR4Me] #1338598 Sat Dec 21 2019 06:01 PM
Joined: Jan 2001
Posts: 4,876
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Pre '68 Dave Offline
Shop Shark
Never seen a failure with one spring pin.
It's the way most manufacturers do and have done it.


See the USA in your vintage Chevrolet!
My Blog
Re: Removing Distributor Gear [Re: ClassicsR4Me] #1338611 Sat Dec 21 2019 07:36 PM
Joined: Feb 2019
Posts: 589
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Phak1 Offline
Jack of all Trades, Master of None
If you think about it, the most likely reason for the pin to shear is a total failure of the oil pump. In that case I personally would prefer the pin to shear than destroy the tang driving the oil pump or distributor.


Phil

1952 Chevrolet 3100
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‘59 235 & hydraulic lifters
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Re: Removing Distributor Gear [Re: ClassicsR4Me] #1338643 Sat Dec 21 2019 11:54 PM
Joined: Jan 2001
Posts: 4,876
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Pre '68 Dave Offline
Shop Shark
Good point!


See the USA in your vintage Chevrolet!
My Blog
Re: Removing Distributor Gear [Re: ClassicsR4Me] #1338646 Sun Dec 22 2019 12:32 AM
Joined: Feb 2004
Posts: 19,671
H
Hotrod Lincoln Offline
Boltergeist
I have seen spring pin failures on a distributor drive, but not on a Chevy engine. The same Ford 300 engine sheared a spring pin twice within a couple of months. After the second failure, I pulled the oil pan and found that the sump had a lot of debris in it from a failing timing gear. The teeth had a plastic coating on them that was breaking down into granules about the size of a match head. The oil pump pickup screen also had holes in the mesh strainer big enough for those pieces to get sucked into the oil pump.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Removing Distributor Gear [Re: ClassicsR4Me] #1338676 Sun Dec 22 2019 06:04 AM
Joined: Dec 2017
Posts: 622
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Dragsix Offline
Shop Shark
I have never had a roll pin failure with a single pin. I safety wire my personal distributor rebuilds primarily because Jim Linder (gmc bubba) did that to one of mine before he stopped doing them so belts and suspenders for me.

On the other hand, my vertex magneto for 235/261 uses a single roll pin. I purchased the vertex as a rebuilt unit from vertex back in the early 80s and have run it up to 6000 rpm no issues with the pin. So I do think a single pin is no problem, that and I am with the others, rather a pin shear then have the tang get taken out on the vertex.


Mike
Re: Removing Distributor Gear [Re: ClassicsR4Me] #1338757 Mon Dec 23 2019 12:36 AM
Joined: Jul 2014
Posts: 168
1
1Ton_tommy Offline
Shop Shark
For what it's worth, perhaps not much, but I once had a 57 Pontiac with factory Rochester Fuel injection. The injection pump was driven off the distributor. The distributor gear was pinned to the shaft with a roll pin -- which sheared more than once. I went back to the dual four barrel setup.


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
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