1946 B - bad 3rd-4th gear

Farmall B & BN Tractors, 1939-1947

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Urbish
501 Club
501 Club
Posts: 1099
Joined: Sat Sep 07, 2013 3:45 pm
Zip Code: 48158
Tractors Owned: ~
1948 Farmall Cub
1947 Farmall H
1946 Farmall B
1953 Willys CJ3B
Circle of Safety: Y
Location: Manchester, MI

1946 B - bad 3rd-4th gear

Postby Urbish » Mon Feb 13, 2017 8:06 am

I finally got a chance to remove the transmission cover from my 1946 B to diagnose terrible racket that was occurring in 3rd and 4th gear (the worst is 3rd). To my dismay, the teeth on the 3rd sliding gear are badly worn (with only about 50% of the tooth surfaces remaining) with lots of chips. The 4th sliding gear is similarly worn and chipped, but not quite as badly.

I added about a gallon of kerosene to the transmission and drove it around for a little bit on Saturday, then drained it. I removed roughly a tablespoon of metal grit and fragments using a magnet pickup tool AFTER flushing with kerosene. The troughs for bearing lubrication were sludged up with thickened gear oil and metal chips. All is clean now, but I'm a little worried about the 3rd and 4th gears. I think I'm going to have to replace the sliding gears as well as their mating gears on the countershaft. And here I was hoping it was a bad bearing.

Jim

User avatar
Urbish
501 Club
501 Club
Posts: 1099
Joined: Sat Sep 07, 2013 3:45 pm
Zip Code: 48158
Tractors Owned: ~
1948 Farmall Cub
1947 Farmall H
1946 Farmall B
1953 Willys CJ3B
Circle of Safety: Y
Location: Manchester, MI

Re: 1946 B - bad 3rd-4th gear

Postby Urbish » Sat Feb 18, 2017 7:45 pm

Here's a photo of the gears. Looks like it's time for a rebuild.
Attachments
20170215_190544.jpg


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