10 Tooth Driveshaft Pinion Gear

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FundyTides
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10 Tooth Driveshaft Pinion Gear

Post by FundyTides » Thu Jun 30, 2022 12:31 pm

Just sorting through some parts that I bought at one time and found what I think is a Model T 10 tooth pinion gear. It looks to be in pretty good shape except for some surface rust. I would appreciate it if someone would confirm that this is in fact a Model T pinion gear. As can be seen in the pictures, there is a divot on the back of one of the teeth and another divot on front of the gear with either a 9 or a 6 stamped beside it. What your call?
pinion2.jpg
pinion1.jpg

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Oldav8tor
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Re: 10 Tooth Driveshaft Pinion Gear

Post by Oldav8tor » Thu Jun 30, 2022 12:58 pm

Looks like one - here is a photo that might help.
10_T_2.JPG
10_T_2.JPG (82.81 KiB) Viewed 1694 times
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Jerry VanOoteghem
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Re: 10 Tooth Driveshaft Pinion Gear

Post by Jerry VanOoteghem » Thu Jun 30, 2022 3:03 pm

The divot on the back is where the hardness of the gear was tested when it was made. A Brinnell mark. The divot on the front face is "damage". Shows signs of use, but probably still got life in it. Looks like a Model T pinion to me. That's my O'Pinion :D

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Re: 10 Tooth Driveshaft Pinion Gear

Post by Pep C Strebeck » Thu Jun 30, 2022 3:37 pm

Jerry VanOoteghem wrote:
Thu Jun 30, 2022 3:03 pm
The divot on the back is where the hardness of the gear was tested when it was made. A Brinnell mark. The divot on the front face is "damage".

Not necessarily. The page below is from the Ford Service Bulletins, published by Ford Motor Company of Canada, and it directly references the mark on the gear. One may very well be a mark from hardness testing, but the one in the center of the tooth would correspond to the Service Bulletin.


924515.png
924514.png
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Re: 10 Tooth Driveshaft Pinion Gear

Post by Jerry VanOoteghem » Thu Jun 30, 2022 3:55 pm

Pep C Strebeck wrote:
Thu Jun 30, 2022 3:37 pm
Jerry VanOoteghem wrote:
Thu Jun 30, 2022 3:03 pm
The divot on the back is where the hardness of the gear was tested when it was made. A Brinnell mark. The divot on the front face is "damage".

Not necessarily. The page below is from the Ford Service Bulletins, published by Ford Motor Company of Canada, and it directly references the mark on the gear. One may very well be a mark from hardness testing, but the one in the center of the tooth would correspond to the Service Bulletin.



924515.png
924514.png
Cool! 8-) I learned a thing today!!! Thanks!!

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FundyTides
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Re: 10 Tooth Driveshaft Pinion Gear

Post by FundyTides » Thu Jun 30, 2022 5:56 pm

Pep C Strebeck wrote:
Thu Jun 30, 2022 3:37 pm
Jerry VanOoteghem wrote:
Thu Jun 30, 2022 3:03 pm
The divot on the back is where the hardness of the gear was tested when it was made. A Brinnell mark. The divot on the front face is "damage".

Not necessarily. The page below is from the Ford Service Bulletins, published by Ford Motor Company of Canada, and it directly references the mark on the gear. One may very well be a mark from hardness testing, but the one in the center of the tooth would correspond to the Service Bulletin.


924515.png
924514.png
Thanks Pep. I had seen that reference to the Service Bulletin before. It is very possible that this pinion came from a Canadian built car considering where I live and most of the T's in this area, including the one I own now and one previous one, are Canadian built cars. There seems to be no end of differences, from wheels and spokes, to Touring back seat cushions and of course Robertson screws, between the US and Canadian built T's. I will clean this gear up a little to see if there are any other markings.


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Re: 10 Tooth Driveshaft Pinion Gear

Post by Allan » Thu Jun 30, 2022 9:11 pm

That divot looks to be machined, like ones on gears I have on the shelves. Hardness testing usually leaves just a small pin prick like a light centre punch mark. Perhaps it had another purpose. Or perhaps the machined divot has a pin prick within?

Allan from down under.

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FundyTides
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Re: 10 Tooth Driveshaft Pinion Gear

Post by FundyTides » Thu Jun 30, 2022 10:02 pm

Allan wrote:
Thu Jun 30, 2022 9:11 pm
That divot looks to be machined, like ones on gears I have on the shelves. Hardness testing usually leaves just a small pin prick like a light centre punch mark. Perhaps it had another purpose. Or perhaps the machined divot has a pin prick within?

Allan from down under.
Hi Allan, There is a pin prick mark 180 degrees across from the divot with the 6 (or 9) beside it. It is much smaller and I didn't see it until I cleaned the gear up with a wire wheel. Would that number be an indication of the hardness?


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Re: 10 Tooth Driveshaft Pinion Gear

Post by Allan » Fri Jul 01, 2022 1:11 am

David, that sounds more like a hardness test mark. I presume the 10 stamp is for 10 teeth, but have no idea what the others are about.

Allan from down under.

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FundyTides
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Re: 10 Tooth Driveshaft Pinion Gear

Post by FundyTides » Fri Jul 01, 2022 8:20 am

Allan wrote:
Fri Jul 01, 2022 1:11 am
David, that sounds more like a hardness test mark. I presume the 10 stamp is for 10 teeth, but have no idea what the others are about.

Allan from down under.
No 10 mark on mine Allan. That was Tim's picture


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Re: 10 Tooth Driveshaft Pinion Gear

Post by Jerry VanOoteghem » Fri Jul 01, 2022 8:41 am

Allan wrote:
Thu Jun 30, 2022 9:11 pm
That divot looks to be machined, like ones on gears I have on the shelves. Hardness testing usually leaves just a small pin prick like a light centre punch mark. Perhaps it had another purpose. Or perhaps the machined divot has a pin prick within?

Allan from down under.
The pin prick comes from a Rockwell hardness test. These gears were tested with a Brinell hardness tester, that uses a ball indenter. Rockwell testing is for higher hardnesses, Brinell is for softer materials.


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Re: 10 Tooth Driveshaft Pinion Gear

Post by Allan » Fri Jul 01, 2022 8:00 pm

Jerry, my experience comes from watching the fellows in my favourite machine shop hardness testing alloy heads after they have been overheated. If they are too soft, they are not worth working on. This is soft material, and the testing tool leaves the small centre punch mark referred to. It seems counter intuitive for a ball type test on harder materials like a steel pinion gear. Rather than just a falling weight for the head testing I mentioned. Such a test on a pinion gear would require a much more robust testing tool. I need further education, again!

Allan from down under.


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Re: 10 Tooth Driveshaft Pinion Gear

Post by Jerry VanOoteghem » Fri Jul 01, 2022 8:43 pm

Allan wrote:
Fri Jul 01, 2022 8:00 pm
Jerry, my experience comes from watching the fellows in my favourite machine shop hardness testing alloy heads after they have been overheated. If they are too soft, they are not worth working on. This is soft material, and the testing tool leaves the small centre punch mark referred to. It seems counter intuitive for a ball type test on harder materials like a steel pinion gear. Rather than just a falling weight for the head testing I mentioned. Such a test on a pinion gear would require a much more robust testing tool. I need further education, again!

Allan from down under.
My experience comes from 35 years in manufacturing. Trust me, it's a Brinell mark. ;)

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