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01-27-2020, 07:25 PM | #1 |
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Join Date: Nov 2015
Posts: 42
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Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
My thrust clearance quadrupled after a 75 mile drive. It’s about .030 now.
D3BE41CA-292A-4E10-98DD-C4C1D412D918.jpg 97DDED91-6BF4-45BC-8AA5-6A40236D5614.jpg I picked up this bronze Model A Ford Rear Main Thrust Plate & Oil Seal 40D8A27B-79CE-42B4-9637-83316E46BF72.jpg I searched for info on the install, but I haven’t found anything. How do I remove the Babbitt thrust portion of the rear main? I was thinking of just scraping it off with a sharp scraper. There must be a better way. |
01-27-2020, 07:43 PM | #2 |
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Re: Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
Read here- https://www.fordbarn.com/forum/showt...=bronze+thrust
There was a better step by step pictorial write-up on the barn but I couldn't locate it. Maybe someone else knows where it is hiding. |
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01-27-2020, 09:42 PM | #3 | |
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Re: Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
Quote:
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01-27-2020, 10:36 PM | #4 |
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Re: Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
Tonight I pulled the crankshaft and started whittling away. It took about 30 minutes with a breakaway utility knife. It almost looks like the end thrust was poured separately from the main bearing. There’s a dirty section in the center that looks like it was not bonded well with the thrust bearing part.
979C26C0-F9F1-4AB4-8676-164FCF16DF45.jpg Anyways, the bronze part fits perfectly. I’ll check the end play after I get everything cleaned up. 7D14046D-0E50-4D2F-B91B-29E33ACCDE3F.jpg I’m replacing the rod nuts with ARP nuts. Should I do the same with the main cap nuts? |
01-28-2020, 08:03 AM | #5 |
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Re: Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
Interesting post; please continue the story and photos. Thanks.
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01-28-2020, 09:38 AM | #6 |
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Re: Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
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01-28-2020, 09:42 AM | #7 |
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Re: Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
ghalperin,
I have used over 150 of these combination thrust and seal in rebuilding A engines with insert bearings. To avoid a leak, bed the combination thrust and seal with a sealant. Permatex #2 works well. Good Day! |
01-28-2020, 06:37 PM | #8 |
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Re: Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
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01-28-2020, 06:38 PM | #9 |
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Re: Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
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01-29-2020, 01:12 AM | #10 |
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Location: Portland OR
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Re: Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
When doing new Babbitt, MAKE SURE THE THRUST FACES ARE AS SMOOTH AS THE JOURNAL ON THE CRANK. That means both ends. If they are not will act like a file and remove material same as a file would.
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01-29-2020, 04:50 PM | #11 |
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Re: Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
Glen, when I put mine back together I used ARP rod nuts and headstuds, like Jim suggests in his book. I also bought the modern sealed main bolt kit from Brattons or Snyders.
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03-24-2020, 03:34 PM | #12 |
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Re: Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
After completely disassembling, adjusting all the babbett's and reassembling, it still knocked. I sent the rods out to have the wrist pin bushings changed. When I was cleaning it up for reassembly, again, I noticed a small mark on the center of the combustion chambers and matching marks on two pistons. I only had .019" between the piston and the head. I had .020" shaved off the tops of the new pistons and all is good.
E08FB0A4-CF1B-42E0-A743-406AEBF8B41E.jpg 2668442A-6592-4623-8B2F-792AA4279682.jpg That little tit on the bottom side of the piston was expanding just enough to kiss the head. 53C74471-0D36-4CCB-840B-FBC924E040B9.jpg |
03-24-2020, 04:14 PM | #13 | |
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Re: Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
Quote:
If it all happened in just a few miles as you state I question the integrity of all three mains, and not just the side faces. If the same guy did the rods you may be in for more problems. As for your desire to change from stock nuts with cotters to ARP nuts, I'd call that overkill unless you're planning some serious mods and racing. |
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03-24-2020, 05:33 PM | #14 | |
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Re: Bronze Model A Ford Rear Main Thrust Plate & Oil Seal installation
Quote:
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