engine rebuild specs

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areger23
Posts: 29
Joined: Sun Dec 17, 2017 5:11 pm
Zip Code: 15636
Tractors Owned: 1949 farmall cub
1950 farmall cub
1973 cub cadet 149
1961 cub cadet original
1951 david bradley super power
and a ton of other small engines

engine rebuild specs

Postby areger23 » Sun Dec 31, 2017 4:54 pm

hey everyone, im looking the rebuild/ reuse specs for my 1950 cub. in the process of a rebuild and i need to know factory engine specs and what maximum wear on parts before replace or machining is necessary.

thanks

staninlowerAL
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Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
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Location: AL (Southwest)

Re: engine rebuild specs

Postby staninlowerAL » Sun Dec 31, 2017 6:39 pm

Welcome to the Forum. You should find all the information that you need in the manuals available at the Quick Links tab, top left corner of this page. There's a service manual on engine rebuilds.

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Glen
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Joined: Mon Mar 19, 2012 7:33 pm
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Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: engine rebuild specs

Postby Glen » Sun Dec 31, 2017 7:12 pm

Hi,
Below is the Cub service manual, GSS-1411, if you didn't find it. The engine is in section 1, I would read it if you are rebuilding a Cub engine. :)

http://www.farmallcub.info/galleries/ci ... actors.asp

ntrenn
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Tractors Owned: 63 Cub 221833 in family since '69
65 Lo-boy 19648 with an un-stuck #4 - it lives!!!
144 Cultivators with disc hillers
193 Plow
42C mower
59L mower mounted on the Fcub
23A Disc - lost possession
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Location: Indiana

Re: engine rebuild specs

Postby ntrenn » Sun Dec 31, 2017 8:27 pm

Use the cub rebuild manual numbers as best you can, but if you are experienced at building engines, you can take a little liberty here and there. I rescued the 65 from the locked up pile. Along the way i found wrist pins that were 0.001 outside the wear limit. I reused them and get a slight cold wrist pin knock. The number 4 cylinder was pitted from rust from a leaky head gasket. Honed and reringed...its still doing fine 5 years later. Oil consumption is less than a quart a season...
The tolerances and wear limits are very tight....and conservative....

User avatar
areger23
Posts: 29
Joined: Sun Dec 17, 2017 5:11 pm
Zip Code: 15636
Tractors Owned: 1949 farmall cub
1950 farmall cub
1973 cub cadet 149
1961 cub cadet original
1951 david bradley super power
and a ton of other small engines

Re: engine rebuild specs

Postby areger23 » Sun Dec 31, 2017 9:27 pm

thanks everyone. i just bought the tractor and it had a cracked head, was just going to do a head gasket and replace some leaking gaskets. the engine ran great before tear down. when i removed the head i noticed some oil sitting on number 2 piston and the cylinder walls had no cross hatching left. so i decided to do a ring job and new rod bearings ( because i nicked one removing the pistons) now im going through and measuring everything to make sure its in spec before i reassemble the engine

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Glen
5+ Years
5+ Years
Posts: 3531
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: engine rebuild specs

Postby Glen » Mon Jan 01, 2018 1:05 am

Hi,
The head bolts go through into the water jacket, and need sealer on the threads to prevent leaking.
Permatex Aviation Form A Gasket works good. It is a non hardening liquid. It comes in a small can with a brush built on under the cap. If you buy one, stir it well before using it, it settles sitting. They have it at NAPA here in the west USA. :)

ntrenn
5+ Years
5+ Years
Posts: 661
Joined: Tue Apr 17, 2012 7:55 pm
Zip Code: 47119
Skype Name: ntrenn
Tractors Owned: 63 Cub 221833 in family since '69
65 Lo-boy 19648 with an un-stuck #4 - it lives!!!
144 Cultivators with disc hillers
193 Plow
42C mower
59L mower mounted on the Fcub
23A Disc - lost possession
Circle of Safety: Y
Location: Indiana

Re: engine rebuild specs

Postby ntrenn » Mon Jan 01, 2018 4:15 pm

Flex hone is your friend....my 65 had .120 ring end gap....make sure you set the end gap to spec...tou will be rewarded...


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