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12-01-2020, 12:44 PM | #1 |
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Model A Rear Main Cap Removal
1929 Model A
With the engine in the car, will a box end wrench loosen the rear main cap nuts for a bearing adjustment? Or do I have to build a special wrench? I built this engine a while back and have put a lot of miles on it & it's starting to get a little noisy. |
12-01-2020, 01:20 PM | #2 |
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Re: Model A Rear Main Cap Removal
I think you will have a hard time with a box wrench. Either the bolt won't be quite lined up right to get the wrench on, and or you won't be able to get enough leverage on the box wrench. They are torqued to 80+ pounds. I have broken them with the proper socket and a breaker bar. There is just enough room to work. Just be sure not to break off the bearing oil pipe. That is right there in the way when the nut breaks loose.
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12-01-2020, 01:48 PM | #3 |
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Re: Model A Rear Main Cap Removal
Thank you
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12-01-2020, 03:40 PM | #4 |
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Re: Model A Rear Main Cap Removal
I have taken the rear cap off with the engine in the car several times but I have to use an old socket handle. It is decades old and Australian made which means top quality steel was used (before the same company went to China chasing cheaper prices and higher profits). Later tools are made with poorer quality metal so they have to use more of it for the strength which makes the tool thicker and with one of those, you will have trouble. Once you drop the sump and remove the cover from the front of the flywheel cover, you will see how confined it is. I suggest you search for an old handle made the way they used to be.
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12-01-2020, 03:52 PM | #5 |
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Re: Model A Rear Main Cap Removal
21/32 socket 12point.
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12-01-2020, 06:53 PM | #6 |
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Re: Model A Rear Main Cap Removal
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12-01-2020, 07:00 PM | #7 |
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Re: Model A Rear Main Cap Removal
This is a mechanics tool from the era, square on one end, hex on the other, and the length is such that you can get the bolts tight enough, but not too tight----in the era of no torque wrenches
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12-02-2020, 03:56 AM | #8 |
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Re: Model A Rear Main Cap Removal
I have never seen a 21/32" socket. 17mm is easy to get (I've got several)
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12-02-2020, 10:33 AM | #9 | |
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Re: Model A Rear Main Cap Removal
Quote:
Pulling the rear cap under the car is not a fun job and one I hope not to repeat any time soon! Rods are a cake walk in comparison.
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12-02-2020, 11:10 AM | #10 |
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Re: Model A Rear Main Cap Removal
Well now you have!Hard to find,but proper size for caps and piston rods.per Henry Ford.
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12-02-2020, 11:44 AM | #11 |
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Re: Model A Rear Main Cap Removal
3/4" not 21/32" for the main bearing nuts.
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12-02-2020, 09:44 PM | #12 |
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Re: Model A Rear Main Cap Removal
I doubt any tool shop will carry such a rarity. There are not many imperial tools about these days. It's been 50 years since we converted.
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12-02-2020, 10:58 PM | #13 |
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Re: Model A Rear Main Cap Removal
Have you heard of UES International company from Australia? My son is UES USA Inc CEO here in the U.S.Been in Australia since 1904.Close by,? Next time he's in Aust. he can drop off a socket to you.
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12-02-2020, 11:55 PM | #14 | |
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Re: Model A Rear Main Cap Removal
Quote:
W. Michael |
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12-03-2020, 03:29 AM | #15 | |
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Re: Model A Rear Main Cap Removal
Quote:
It's the big end nuts that cause most angst so I file them to take the nearest metric. Better still, I replace the originals with new 12 point nuts, even Nylocks. 16mm is 5/8" which is what I use on the mains and 21/32" is 17 mm.. With a decent set of metric sockets, I have one for every mm. That is 0.040". 1/32" is 0.031" It is not until we get to the smaller sizes that a step of that size might cause an issue. I also have some old Whitworth spanners and every now and then, one of those fits.
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12-03-2020, 11:55 PM | #16 |
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Re: Model A Rear Main Cap Removal
In 1998 when I got my 1931 160B I dropped the pan and tightened up the mains and the rods with the engine in the car. For the rear main I used a PROTO 3/4 inch 12 point swivel socket 3/8 inch drive, part # 5279
here is a listing on eBay for the item for $8.99 with free shipping, their listing is for one and there is 4 available, and they are new!! https://www.ebay.com/itm/254389323368 They list new for $54.92 https://www.amazon.com/PROTO-5279A-S.../dp/B009OYVSV8
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1931 160B & 1931 68B If you don't have time to do it right the 1st time, how do you have time to do it the 2nd time? Last edited by 160B; 12-05-2020 at 12:09 PM. |
12-04-2020, 07:46 AM | #17 |
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Re: Model A Rear Main Cap Removal
An old Snapon 3/8 flat style torque wrench will allow you to re-torque those rear main bolts in the car.
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12-14-2020, 10:54 AM | #18 |
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Re: Model A Rear Main Cap Removal
Is there something that holds the bolt in place from the top to keep it from spinning while trying to back the nut off?
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12-14-2020, 10:59 AM | #19 |
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Re: Model A Rear Main Cap Removal
Yes, the top of the bolt is "D" shaped and is wedged in there. It will not come out or turn, when you are accessing it from below.
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12-14-2020, 11:44 AM | #20 |
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Re: Model A Rear Main Cap Removal
Ditto, but it will push up, so one has to be careful when re-installing the cap.
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