4th Main Oil Hole Details
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MossPointMachine
Topic author - Posts: 4
- Joined: Tue Feb 21, 2023 8:32 pm
- First Name: Stephen
- Last Name: Capdepon
- * REQUIRED* Type and Year of Model Ts owned: 25 T truck
- Location: MossPoint Ms
4th Main Oil Hole Details
Can someone help with the size and location to redrill the 4 th main oil hole, measurement from shoulder would be good. Trying to finish an engine my Dad built for me before he passed away. I can’t see any trace of the hole in the shell he had re babbited. Thanks
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speedytinc
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Re: 4th Main Oil Hole Details
The hole is in the middle of the collar, about 3/8" with an oil cut forward & aft to lube a larger surface of the shaft. (but short about 1/2" from the output shaft end)
I also caution you that your indicator in not in the correct place for centering.
Only the narrow machined area next to the flange face is correct for perfect centering.
I also caution you that your indicator in not in the correct place for centering.
Only the narrow machined area next to the flange face is correct for perfect centering.
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MossPointMachine
Topic author - Posts: 4
- Joined: Tue Feb 21, 2023 8:32 pm
- First Name: Stephen
- Last Name: Capdepon
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Re: 4th Main Oil Hole Details
Thanks for your prompt reply, yes I did indicate the flat land next to the mounting flange. I had read that in another post. Appreciate the help.
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RGould1910
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Re: 4th Main Oil Hole Details
Seen a lot of 4th mains but never an oil cut. I don't think it's necessary but it's not a bad idea. Don't believe they came that way from the factory tho.
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TRDxB2
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Re: 4th Main Oil Hole Details
Jig boring the 4th main http://www.mtfca.com/discus/messages/25 ... 1356153477
from Lang's part specs
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The past is a great place and I don't want to erase it or to regret it, but I don't want to be its prisoner either.
Mick Jagger
Mick Jagger
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speedytinc
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- Board Member Since: 2020
Re: 4th Main Oil Hole Details
I disagree with the clearance specs as provided. Way too loose.TRDxB2 wrote: ↑Wed Jan 07, 2026 11:57 pmJig boring the 4th main http://www.mtfca.com/discus/messages/25 ... 1356153477
holll.png
from Lang's part specs
Untitled.png
4-6 will pass a lot of oil into the U-joint especially if you are using a transmission screen.
.0015-.002 is what I fit to in this part with babbit, same as for rods & mains.