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Cylinder tolerance
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Brodalick
- 5+ Years
- Posts: 130
- Joined: Mon Feb 12, 2018 4:59 pm
- Zip Code: 28540
- Tractors Owned: 1948 Cub
- Location: Jacksonville NC
Cylinder tolerance
I found info that the cylinders should measure 2.625, mine measures 2.632 after honing. Is this within the tolerance level for standard rings?
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Slim140
- 5+ Years
- Posts: 4908
- Joined: Wed Nov 22, 2017 6:24 am
- Zip Code: 00000
- Tractors Owned: .
1970 International 140
1972 International 140
1949 John Deere A
1993 Ford 4630 W/Loader
1965 John Deere 110
1961 Cub Cadet Original - Circle of Safety: Y
Re: Cylinder tolerance
Should be within .0016" to .0024" so no, it's not within tolerance. Yon only lack .003" from being .010" over which is the next bore size.
Every home is a school, what are you teaching?
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tst
- 10+ Years
- Posts: 5212
- Joined: Tue Jan 12, 2010 2:08 pm
- Zip Code: 12514
- Circle of Safety: Y
Re: Cylinder tolerance
it needs to be bored
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ricky racer
- 10+ Years
- Posts: 6337
- Joined: Wed Sep 12, 2007 8:40 pm
- Zip Code: 49120
- Circle of Safety: Y
- Location: Niles / Buchanan, Michigan
Re: Cylinder tolerance
tst wrote:it needs to be bored
1929 Farmall Regular
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub
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Brodalick
- 5+ Years
- Posts: 130
- Joined: Mon Feb 12, 2018 4:59 pm
- Zip Code: 28540
- Tractors Owned: 1948 Cub
- Location: Jacksonville NC
Re: Cylinder tolerance
My micrometer was an el cheapo from HF. Used a friend's good one and my numbers are actually between 2.636 and 2.638. Here's the issue now. The piston look to be stock/standard ones. Is it possible to put over sized rings on standard size pistons? If so that's what someone did.
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ricky racer
- 10+ Years
- Posts: 6337
- Joined: Wed Sep 12, 2007 8:40 pm
- Zip Code: 49120
- Circle of Safety: Y
- Location: Niles / Buchanan, Michigan
Re: Cylinder tolerance
Yep, she's worn out and needing a rebore. The good thing is once rebuilt will be as good a new. The bad thing is it will cost you a bit to freshen it up. Still, for the investment, if the rest of your tractor is in good shape, you'll get a tractor that to replace it with something similar would cost you thousands more.
1929 Farmall Regular
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub
1935 John Deere B
1937 John Deere A
1941 John Deere H
1952 John Deere B
1953 Farmall Cub
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Brodalick
- 5+ Years
- Posts: 130
- Joined: Mon Feb 12, 2018 4:59 pm
- Zip Code: 28540
- Tractors Owned: 1948 Cub
- Location: Jacksonville NC
Re: Cylinder tolerance
I agree. She's seen better days. Not sure how it was even running. Had almost no compression what so ever.
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ntrenn
- 10+ Years
- Posts: 804
- 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: Cylinder tolerance
You need to set the end gap on the rings. I will bet money that the stsndard rings with no end filing will hit just about perfect. I had 0.120 ring end gap on the 65 and about the same bore that you have. New rings with no filing hit right at 0.020 end gap...just a couple thou over spec.
When searching for rings...there are $100 chrome moly sets and $40 standard sets. Its been 5 years on the standard set for me....so far so good...
When searching for rings...there are $100 chrome moly sets and $40 standard sets. Its been 5 years on the standard set for me....so far so good...
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Gary Dotson
- Team Cub Mentor
- Posts: 5640
- Joined: Thu Aug 03, 2006 6:20 am
- Zip Code: 43358
- Tractors Owned: 48 Cub Diesel (Cubota)
53 Cockshutt 20 restored (Shooter)
52 Cockshutt 20 unrestored
47 Leader "B" (Herckie)
49 Leader "D" (Princess)
49 Leader "D" very rough
48 Leader "D" unrestored
Kubota B6200E
Kubota B6200HST
Kubota B8200HST-D - Circle of Safety: Y
- Location: OH West Mansfield
Re: Cylinder tolerance
Where in the cylinder was this measurement taken? They should be measured near the top, at the middle of the ring travel and at the bottom of the ring travel. Measure front to back and side to side. Your measurement that you posted is already + .010, but I'm guessing that is near the top. It will probably measure closer to standard at the bottom of the bore. It is not possible to set ring gaps to work properly in this situation. If the end gap is set proper at the top (+.010 rings) there will be no gap at the bottom of the bore and that's not good. You need to do a full set of measurements on all four cylinders, then properly assess what you have.
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ntrenn
- 10+ Years
- Posts: 804
- 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: Cylinder tolerance
My bad....i read .002-.003 over. Best to bore and while at it...consider the aluminum piston upgrade....
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