Disassembled the Super A engine today

Farmall Super A, AV, 100, 130, & 140 1939 - 1973

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Big Mike
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Disassembled the Super A engine today

Postby Big Mike » Sat Jan 27, 2018 8:00 pm

Thanks to everyone for your guidance and advice on my Super A engine. I completely disassembled it today and was successful in removing the sleeves without trashing the block. Now I need to order parts and seek your recommendations. All the bearings appear to be standard and the mains looked pristine. There were no stampings on neither the rod nor main inserts to indicate that they were undersized. Measurements on the main crank journals were 2.130 (#1), 2.125 (#2), and 2.123 (#3). The rod inserts showed VERY slight pitting and the crank journals measured 1.750 (#1), 1.750 (#2), 1.750 (#3), and 1.750 (#4). The engine had great oil pressure but the front main leaked badly and the engine smoked. It appears that someone had honed the sleeves and put in new rings as there was essentially no ridge in the sleeves. Do these journal measurements sound correct for standard inserts? I was able to pull the crankshaft pulley without damage by building a puller, heating the boss and using a 6 ton hydraulic jack. The timing cover had apparently never been removed as I had to cut the factory seal on the governor to remove it. Now it's pressure washing time as someone had at some point filled the radiator with creek water (there were actually elm leaves and mud evident when the sleeves were out). I removed the throw out bearing and it appears that it was a graphite bearing (although there was absolutely no graphite on the face). Any input from the experts here would be greatly appreciated and I thank you in advance.
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Re: Disassembled the Super A engine today

Postby Shane Nelson » Sat Jan 27, 2018 8:08 pm

The main #1 @ 2.130” seams out of spec if #2 is 2.125”. Check #3 again to make really sure it’s 2.123”. Seems odd for one to be under size. I’m not even sure what the tolerance is on these but I would think +.005” is on the high side. With the rest of your measurements I would think the oil pressure was great as you stated.

Edit: after reading your post again I may have my numbers backwards as far as high and low but .007” is a lot of difference on mains (2.123” to 2.030”).
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Re: Disassembled the Super A engine today

Postby Jim Becker » Sat Jan 27, 2018 8:56 pm

You better remeasure the main journals. The mains are supposed to be 2.125, making a 2.130 measurement suspect. Running clearance should be .0015 to .003 so you may be OK on #3.

Big Mike
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Re: Disassembled the Super A engine today

Postby Big Mike » Sun Jan 28, 2018 7:05 am

Thanks everyone for your input. I'll recheck my measurements just to make certain as it sounds as if I may have misread the calipers.
1950 Cub Demonstrator (painted red because I couldn't plow with a white tractor)
Mahindra 6500FWD
1959 Willys Truck
1969 Jeep CJ5
F250 Ford King Ranch 6.7L diesel
1964 Massey 135
1953 Super A
Two or three chickens
One lazy tomcat
Lifetime NRA member


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