The Ford Barn

mcgarrett · 02-19-2024, 01:26 PM

Have this 2 piece pulley that came with a core Model A engine. What caught my attention is that it has no notches in the pulley to drive the part that the rope seal runs against. The part # is B 8312 A1. Anything special about it? Just curious...

wrndln · 02-19-2024, 02:02 PM

Post a picture of it.

Bob C · 02-19-2024, 02:11 PM

Number is probably 6312.

alexiskai · 02-19-2024, 03:22 PM

There's a version of the two-piece pulley where the pulley threads onto the keyed part using LHT, is that what you're seeing?

https://www.musclecarsandclassics.ca...r-ford-model-b

Joe K · 02-19-2024, 04:02 PM

I've had one of those - bought new in the 1990s.

"That's how they're making them now" was the explanation that came with it.

I considered with an engine "stop" the block may tend to "back-run" on compression as the stopped engine achieves it's "neutral point" (even compression between cylinders.) A back-run which might undo the thread. So I used red loctite on the threads as it was put together.

Currently out on the "stable" of engines - been run - no problems.

Joe K

mcgarrett · 02-19-2024, 09:08 PM

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Finally got the photos. After looking again, I believe the number is B 6312 A1.
So do the 2 pieces depend on a slight interference fit and tension on the crankshaft bolt to keep from spinning?

mcgarrett · 02-19-2024, 09:10 PM

BTW, no threads to keep them together. Apparently just tension.

Joe K · 02-19-2024, 09:25 PM

Quote:

Originally Posted by mcgarrett

BTW, no threads to keep them together. Apparently just tension.

No small taper? No evidence of "glue?" Is it "tight" on manual assembly?

There has been a lot of "junque" manufactured for the Model A - a lot of this coming from "offshore" sources.

One thinks of the Brazilian fare offered by Rick Freeman - some of the quality of that stuff was a name not mentioned in public.

I remember getting the same piece from a local vendor at the time located in North Hampton, NH. The seller was best described as "enterprising" - and he actually made a lot of money in the house building/house component business. The windows in my present house were provided by his supply house.

But he "tinkered" in Model A - and had the where-with-all to actually set himself up in the retail business right on Route 1. Nice shop with everything on shelves set up facing the front door.

The same piece he sold to me appeared right - except it couldn't be got on over the crankshaft - the hole was too small.

He was good about the return. Explanation of "offshore junque." Another from his stock was found acceptable.

Joe K

mcgarrett · 02-19-2024, 09:58 PM

JoeK,
There seems to be a slight taper between the 2 parts. I suppose it worked once it was tightened down. It was assembled on the crank of a Feb. 20, 1937 engine I bought a few years back. I'm told the engine was a "Service Replacement" block judging by the date code on the block. I was robbing parts from it for another engine I'm building when I noticed that it wasn't like any of the 2 piece pulleys I've seen. I'm assuming it is an aftermarket piece. Any ideas?

Joe K · 02-19-2024, 10:51 PM

Well, Model A engines were available all the way up to WWII - and possibly beyond depending on the backwater Ford Dealership.

Baldwin Gleaners were outfitted with Model A engines and are now the source of many "diamond" engines - the parts found on these CAN be "different."

A gaggle of engines were sold to Gordon-Smith for use in conversion to air compressors.

And there were other places that Model A engines ended up. The "Unauthorized accessories" book has pages on these. (i.e. cement mixers, hoists, welders, generators)

It is sounding like this is a step above "foreign junque." Maybe even worth keeping going, provided you have assurance of no relative motion between the parts.

Loctite would obviously improve the tendency of parts to stay together. I would hesitate to actually "pin" the parts as part sections seem like they would be thin and the pin small.

I might center punch the parts once everything is bolted in place - to positively identify any relative motion that you don't want.

Good luck with this!

Joe K

Y-Blockhead · 02-19-2024, 11:36 PM

Quote:

Originally Posted by Joe K

There has been a lot of "junque" manufactured for the Model A - a lot of this coming from "offshore" sources.

Joe K

Herny referred to them as "GYP parts".

02-19-2024, 01:26 PM	#1
mcgarrett Senior Member Join Date: Dec 2013 Location: Waxahachie, Texas Posts: 949	ID this pulley? Have this 2 piece pulley that came with a core Model A engine. What caught my attention is that it has no notches in the pulley to drive the part that the rope seal runs against. The part # is B 8312 A1. Anything special about it? Just curious...

02-19-2024, 02:02 PM	#2
wrndln Senior Member Join Date: May 2010 Location: Lakeville, MN Posts: 5,164	Re: ID this pulley? Post a picture of it.

02-19-2024, 02:11 PM	#3
Bob C Senior Member Join Date: May 2010 Location: So Cal Posts: 8,754	Re: ID this pulley? Number is probably 6312.

02-19-2024, 03:22 PM	#4
alexiskai Senior Member Join Date: Apr 2018 Location: Mebane NC Posts: 2,355	Re: ID this pulley? There's a version of the two-piece pulley where the pulley threads onto the keyed part using LHT, is that what you're seeing? https://www.musclecarsandclassics.ca...r-ford-model-b

02-19-2024, 04:02 PM	#5
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: ID this pulley? I've had one of those - bought new in the 1990s. "That's how they're making them now" was the explanation that came with it. I considered with an engine "stop" the block may tend to "back-run" on compression as the stopped engine achieves it's "neutral point" (even compression between cylinders.) A back-run which might undo the thread. So I used red loctite on the threads as it was put together. Currently out on the "stable" of engines - been run - no problems. Joe K __________________ Shudda kept the horse.

02-19-2024, 09:10 PM	#7
mcgarrett Senior Member Join Date: Dec 2013 Location: Waxahachie, Texas Posts: 949	Re: ID this pulley? BTW, no threads to keep them together. Apparently just tension.

02-19-2024, 09:58 PM	#9
mcgarrett Senior Member Join Date: Dec 2013 Location: Waxahachie, Texas Posts: 949	Re: ID this pulley? JoeK, There seems to be a slight taper between the 2 parts. I suppose it worked once it was tightened down. It was assembled on the crank of a Feb. 20, 1937 engine I bought a few years back. I'm told the engine was a "Service Replacement" block judging by the date code on the block. I was robbing parts from it for another engine I'm building when I noticed that it wasn't like any of the 2 piece pulleys I've seen. I'm assuming it is an aftermarket piece. Any ideas?

02-19-2024, 10:51 PM	#10
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: ID this pulley? Well, Model A engines were available all the way up to WWII - and possibly beyond depending on the backwater Ford Dealership. Baldwin Gleaners were outfitted with Model A engines and are now the source of many "diamond" engines - the parts found on these CAN be "different." A gaggle of engines were sold to Gordon-Smith for use in conversion to air compressors. And there were other places that Model A engines ended up. The "Unauthorized accessories" book has pages on these. (i.e. cement mixers, hoists, welders, generators) It is sounding like this is a step above "foreign junque." Maybe even worth keeping going, provided you have assurance of no relative motion between the parts. Loctite would obviously improve the tendency of parts to stay together. I would hesitate to actually "pin" the parts as part sections seem like they would be thin and the pin small. I might center punch the parts once everything is bolted in place - to positively identify any relative motion that you don't want. Good luck with this! Joe K __________________ Shudda kept the horse.