Points adjustment screw broken :(

Farmall M, Super M, 400, 450 & 560 Tractors, 1939-1963

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Radec Aksarben
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Points adjustment screw broken :(

Postby Radec Aksarben » Fri Jul 28, 2017 12:05 pm

I broke the head off my points adjustment screw.

I have the upright Delco Remy type distributor.

The screw head is offset from the shank.

Does anyone know where I can get another one?

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Re: Points adjustment screw broken :(

Postby Scrivet » Sat Jul 29, 2017 7:52 am

Don't have a clue where to find one, but am curious about it being "offset from the shank". That seems very unusual, what advantage does this arrangement provide over a normal screw?

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Re: Points adjustment screw broken :(

Postby Dale Finch » Sat Jul 29, 2017 7:57 am

Perhaps the "offset" was there because the head was already partially broken and had rotated to that offset position.

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Re: Points adjustment screw broken :(

Postby Gary Dotson » Sat Jul 29, 2017 12:01 pm

The head of the screw is offset so that as it's turned, it opens or closes the point gap. You'll probably have to find an old Delco distributor to pirate one from.

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Re: Points adjustment screw broken :(

Postby Matt Kirsch » Thu Aug 03, 2017 1:10 pm

In a pinch, could you use a straight screw and slot the points with a dremel tool to allow adjustment?

If there is a separate screw to hold down the points? If so you could just forego the eccentric screw and adjust them the old fashioned way.

I haven't been under the distributor cap on one of those so I don't know what it looks like.

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Radec Aksarben
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Re: Points adjustment screw broken :(

Postby Radec Aksarben » Tue Aug 08, 2017 4:29 pm

It does have a separate hold down screw thankfully.

I will try to remember to take pictures tonight before I use it :D to mow nasty Canada thistles!!! :(

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Radec Aksarben
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Re: Points adjustment screw broken :(

Postby Radec Aksarben » Mon Aug 14, 2017 2:16 pm

Well I did remember to take the pictures the other night, but this is the first I've gotten them off the camera.
P1180990.JPG

The screw shank still in the distributor
P1180993.JPG

The screw head:
P1180991.JPG

P1180992.JPG

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Don McCombs
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Re: Points adjustment screw broken :(

Postby Don McCombs » Mon Aug 14, 2017 3:57 pm

Is it my imagination, or does the screw shaft look to be brass and the head is steel? Or perhaps the entire screw is brass?
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Re: Points adjustment screw broken :(

Postby Scrivet » Wed Aug 16, 2017 8:04 pm

:{_}: I understand! Thanks for the pictures. Could you drill & thread a hole in the broken off head? You've already got the appropriate offset marked where the old shank broke off. Then insert a screw with the head cut off of the appropriate size with a spot of loctite. You may have to cut out the slot depending on where the offset is.

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Radec Aksarben
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Re: Points adjustment screw broken :(

Postby Radec Aksarben » Thu Aug 17, 2017 11:43 am

Don McCombs wrote:Is it my imagination, or does the screw shaft look to be brass and the head is steel? Or perhaps the entire screw is brass?


I think it's all brass.

Scrivet wrote::{_}: I understand! Thanks for the pictures. Could you drill & thread a hole in the broken off head? You've already got the appropriate offset marked where the old shank broke off. Then insert a screw with the head cut off of the appropriate size with a spot of loctite. You may have to cut out the slot depending on where the offset is.


Boy, I don't know. Might be worth a shot though if I can't find anything.
I wonder if there is enough clearance to make an offset washer beneath a normal headed screw.

Or maybe there exists some fat head screw I could cut down to fit.

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Re: Points adjustment screw broken :(

Postby Jim Becker » Thu Aug 17, 2017 9:01 pm

Or take the broken piece out and adjust it the hard way.

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Re: Points adjustment screw broken :(

Postby Bob McCarty » Thu Aug 17, 2017 9:50 pm

Have you gotten the broken piece out and if so, what is the bolt size? What is the head diameter? I'm looking for something that could be modified to work. I think you can remove the plate and examine it from the bottom side too. It may be peened on the bottom and not threaded at all.
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Gary Dotson
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Re: Points adjustment screw broken :(

Postby Gary Dotson » Fri Aug 18, 2017 7:02 am

I don't think it's a screw at all. Merely an adjustment accentric and as Bob said, is probably peened on the bottom.

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Re: Points adjustment screw broken :(

Postby Bob McCarty » Fri Aug 18, 2017 5:13 pm

Talked to a friend who said the whole plate was the replacement part. I'll check with our old timer at the tractor parts store to see if it's still available. He'll know even without a part #.
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Re: Points adjustment screw broken :(

Postby Scrivet » Fri Aug 18, 2017 8:45 pm

Bob McCarty wrote:........It may be peened on the bottom and not threaded at all.
I was thinking how these didn't get broken off constantly by trying to nudge the points just a little farther once the head had bottomed out. Just spinning in the hole in the plate would definitely make more sense than a screw!


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