Model T Generator
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Topic author - Posts: 6411
- Joined: Sun Feb 14, 2021 10:08 pm
- First Name: Pat
- Last Name: McNallen
- * REQUIRED* Type and Year of Model Ts owned: 1926-7 roadster
- Location: Graham, Texas
- MTFCA Number: 51486
- Board Member Since: 2021
Model T Generator
How much fore and aft slack is allowable in a 26-27 Model T generator? The gear seems to be tight on the shaft and the generator works normally, but I can move the shaft back and forth about 3/32".
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- Posts: 5205
- Joined: Sun Jan 06, 2019 7:21 pm
- First Name: Allan
- Last Name: Bennett
- * REQUIRED* Type and Year of Model Ts owned: 1912 van, 1917 shooting brake, 1929 roadster buckboard, 1924 tourer, 1925 barn find buckboard, 1925 D &F wide body roadster, 1927LHD Tudor sedan.
- Location: Gawler, Australia
Re: Model T Generator
I believe the generator has two ball bearings. For the shaft to be moving in and out either the bearings are loose on the shaft or loose in the housings. Otherwise, the bearings themselves must be on the way out.
I could be wrong.
Allan from down under.
I could be wrong.
Allan from down under.
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Topic author - Posts: 6411
- Joined: Sun Feb 14, 2021 10:08 pm
- First Name: Pat
- Last Name: McNallen
- * REQUIRED* Type and Year of Model Ts owned: 1926-7 roadster
- Location: Graham, Texas
- MTFCA Number: 51486
- Board Member Since: 2021
Re: Model T Generator
I read the service manual and found no reference to making any adjustment to the bearings. The gear comes very close to the timing cover when moved forward. Doesn't look right to me. The commutator looks normal and the bearings do not seem to have radial play, but I haven't taken the generator off the car yet.
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- Posts: 6431
- Joined: Sun Jan 06, 2019 11:18 am
- First Name: Scott
- Last Name: Conger
- * REQUIRED* Type and Year of Model Ts owned: '13, '15, '19, '23
- Location: Clark, WY
- Board Member Since: 2005
Re: Model T Generator
Shim the rear bearing forward in its housing.
Scott Conger
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves
Obsolete carburetor parts manufactured
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves
Obsolete carburetor parts manufactured
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Topic author - Posts: 6411
- Joined: Sun Feb 14, 2021 10:08 pm
- First Name: Pat
- Last Name: McNallen
- * REQUIRED* Type and Year of Model Ts owned: 1926-7 roadster
- Location: Graham, Texas
- MTFCA Number: 51486
- Board Member Since: 2021
Re: Model T Generator
Thank you, Scott. I'll give that a try.
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- Posts: 3840
- Joined: Fri Feb 12, 2021 12:24 pm
- First Name: john
- Last Name: karvaly
- * REQUIRED* Type and Year of Model Ts owned: 14/15 wide track roadster. 23 touring, 27 roadster pickup, 20ish rajo touring
- Location: orange, ca
- MTFCA Number: 14383
- Board Member Since: 2020
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- Posts: 892
- Joined: Sun Jan 06, 2019 12:28 pm
- First Name: James
- Last Name: Bartsch
- * REQUIRED* Type and Year of Model Ts owned: '26 Coupe
- Location: Dryden, NY 13053
- MTFCA Number: 30615
- MTFCA Life Member: YES
Re: Model T Generator
The Coilman put me on to a 'finger disc spring' made specifically for this purpose, it goes inside the endcap and presses against the bearing with moderate spring pressure taking up the endplay. Because it is a spring, it accomodates thermal expansions/contractions without binding or getting loose, and it won't get chewed up or attract dirt like a piece of felt. If you own a Coilman generater rebuild, I bet you own this part. It is McMaster Karr p/n 9717k65, jb https://www.mcmaster.com/catalog/9717k65
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- Posts: 1350
- Joined: Sun Jan 06, 2019 11:57 am
- First Name: John
- Last Name: Tannehill
- Location: Hot Coffee, MS
- MTFCA Number: 49460
Re: Model T Generator
James that’s a great solution. I’ll give that a try.
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- Posts: 892
- Joined: Sun Jan 06, 2019 12:28 pm
- First Name: James
- Last Name: Bartsch
- * REQUIRED* Type and Year of Model Ts owned: '26 Coupe
- Location: Dryden, NY 13053
- MTFCA Number: 30615
- MTFCA Life Member: YES
Re: Model T Generator
It was a perfect fit in the generator I rebuilt. I wish the vendors would carry those springs as individual sale items. jb (And I wish mtfca would rewrite the electrical guidebook, removing the suggestion to bash in the generator endplate with a hammer to take up this endplay, and maybe suggest using a finger spring washer instead!)
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Topic author - Posts: 6411
- Joined: Sun Feb 14, 2021 10:08 pm
- First Name: Pat
- Last Name: McNallen
- * REQUIRED* Type and Year of Model Ts owned: 1926-7 roadster
- Location: Graham, Texas
- MTFCA Number: 51486
- Board Member Since: 2021
Re: Model T Generator
The generator needs some end play, and the spring washer is an ideal solution, whether used alone or with some shimming in the case of worn parts. It looks as though the large bearing is supposed to be a light press fit and the small bearing is supposed to be a very light press fit. Either my bearing(s) are loose or the large bearing is too loose in the end frame.
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- Posts: 892
- Joined: Sun Jan 06, 2019 12:28 pm
- First Name: James
- Last Name: Bartsch
- * REQUIRED* Type and Year of Model Ts owned: '26 Coupe
- Location: Dryden, NY 13053
- MTFCA Number: 30615
- MTFCA Life Member: YES
Re: Model T Generator
Pat: Likely loose bearing on gear end of shaft. I replaced both brgs with sealed units and used green penetrating loctite on the gear end brg/shaft. I like the notion of sealed brg on gear end to keep oil out of gen housing, tho I still used the oil slinger ring. best, jb