Identity of factory tool

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nifty
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Identity of factory tool

#1

Post by nifty »

Can anyone positively identify this BT trans sprocket wrench?
Is it a 94660-25, or 94660-37, or something else?
No stamped part number, but it is genuine MoCo and fits 1-7/8" hex x 1" clearance hole for mainshaft and13 inches tip to tip.
Has one replacement handle, surviving original handle shows much usage (has had more hits than Elvis).
Edge as been chamfered/ground, probably to fit into L38-64 35159-39 oil deflector cup.
Has remnant nickel plating, which was common in 1920's and to me suggests 94660-25.
Any thoughts?

Nifty
94660-25 trans sprock wrench.jpg
94660-25 trans sprock wrench.jpg (7.99 KiB) Viewed 283 times
94660-37 trans sprock wrench.jpg
94660-37 trans sprock wrench.jpg (9.16 KiB) Viewed 283 times
trans sprock wrench a.JPG
trans sprock wrench a.JPG (174.65 KiB) Viewed 283 times
trans sprock wrench b.JPG
trans sprock wrench b.JPG (202.42 KiB) Viewed 283 times
trans sprock wrench c.JPG
trans sprock wrench c.JPG (209.02 KiB) Viewed 283 times
trans sprock wrench d 13 inch.JPG
trans sprock wrench d 13 inch.JPG (167.76 KiB) Viewed 283 times
flatboy1950
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Re: Identity of factory tool

#2

Post by flatboy1950 »

I have one of these ; mine appears to have been parkerized & full length is 16.5 inches.
Certainly mine fits all 40's , 50's & 60's Big twin c-shaft sprocket nuts ....
RooDog
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Re: Identity of factory tool

#3

Post by RooDog »

nifty wrote: Tue Sep 06, 2022 12:42 am Can anyone positively identify this BT trans sprocket wrench?
Is it a 94660-25, or 94660-37, or something else?
No stamped part number, but it is genuine MoCo and fits 1-7/8" hex x 1" clearance hole for mainshaft and13 inches tip to tip.
Has one replacement handle, surviving original handle shows much usage (has had more hits than Elvis).
Edge as been chamfered/ground, probably to fit into L38-64 35159-39 oil deflector cup.
Has remnant nickel plating, which was common in 1920's and to me suggests 94660-25.
Any thoughts?

Nifty
94660-25 trans sprock wrench.jpg
94660-37 trans sprock wrench.jpg
trans sprock wrench a.JPG
trans sprock wrench b.JPG
trans sprock wrench c.JPG
trans sprock wrench d 13 inch.JPG
Funny thing is, regardless what the MoCo calls it, there is no sprocket on the countershaft, only on the main drive gear
The countershaft, more correctly called a layshaft, is buried deep within the transmission.....
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Re: Identity of factory tool

#4

Post by RUBONE »

There is a third version as well which uses the same part number, with an extended shaft allowing the handle to be outboard of the transmission shaft and making it easier to use. There is one in this pictureon the left in Cad plate. In the '35 catalog it does not yet have a year suffix, just an "X" as most accessories and tools did, and says it fits back to '16. I'll look in earlier and later catalogs for more info.
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nifty
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Re: Identity of factory tool

#5

Post by nifty »

RooDog wrote: Tue Sep 06, 2022 4:07 pm
nifty wrote: Tue Sep 06, 2022 12:42 am
Funny thing is, regardless what the MoCo calls it, there is no sprocket on the countershaft, only on the main drive gear
The countershaft, more correctly called a layshaft, is buried deep within the transmission.....
Roodog
The terminology stems from pre WW1 and the invention of what was known as the 2 shaft or, in the parlance of the day, the "counter-shaft gearbox/transmission". Which, initially as a generally 3 speed device, was a revolutionary improvement, compared to the preceding direct belt drive and fragile 2, or 3 speed epicyclic transmissions built into rear wheel hubs.

People are lazy and language is constantly evolving, hence abbreviation to "countershaft sprocket" because it was attached to/associated with the "counter-shaft gearbox/transmission". Single gear race bikes use single shaft "countershafts" to obtain desired overall ratio, with acceptable sprocket sizes. To call these "mainshafts" would to some, perhaps, be more technically correct, but crazy due to long established, real world usage.

As to the correctness of countershaft, or layshaft, both words are "correct" the countershaft "lays" alongside and "counter to" the mainshaft. In some places, layshaft is a very common automotive term and what I was trained with. However we are MoCo product enthusiasts, sharing a MoCo product forum with many who struggle with the "English" language and layshaft is not a term used by the MoCo. So IMHO, the best path is for all to use MoCo language. "Singing from the same song sheet". We are also all human, some lazier than others, set in our ways etc, so we also cut each other a little slack.
Nifty
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Re: Identity of factory tool

#6

Post by RooDog »

Bla, Bla, Bla. Nifty....
The counter shaft on a Harley Big Twin does not have a sprocket, period.
BUT, some motorcycles do have a CS sprocket, some of our readers don't know which end of a hammer is metric, so let's not confuse the issue just for the sake of laziness.
I keep it simple, and refer to said sprocket as the Transmission Sprocket, and let the chips fall where they may....
....RooDog....
Last edited by RooDog on Sat Sep 17, 2022 1:30 pm, edited 1 time in total.
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Re: Identity of factory tool

#7

Post by Hogey »

RooDog wrote: Wed Sep 07, 2022 12:48 am Bla, Bla, Bla. Nifty....
The counter shaft on a Harley Big Twin does not have a sprocket, period.
BUT, some motorcycles do have a CS sprocket, some of our reader don't know which end of a hammer is metric, so let's not confuse the issue just for the sake of laziness.
I keep it simple, and refer to said sprocket as the Transmission Sprocket, and let the chips fall where they may....
....RooDog....
That is FN Funny Roo :lol:
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