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Cylinder compression
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- 5+ Years
- Posts: 40
- Joined: Sun Sep 24, 2017 7:33 am
- Zip Code: 10517
- Tractors Owned: IH Cub 1972
Mahindra 2615HST
Ariens GT16
Sold- Oliver Super 55 - Location: Mohegan Lake,NY
- Contact:
Cylinder compression
I have been looking for compression data for without any luck. Can anyone tell me what compression to expect running a dry compression test on both the flat and domed piston models. I'm going to look at a 60s and 70s model year cub today.
Thanks!
Greg
Thanks!
Greg
"I have nothing to do today and by noon I want to be half done"
1972 Cub
Ariens GT16
Mahindra 2615
1972 Cub
Ariens GT16
Mahindra 2615
- AL Farmall Boy
- 10+ Years
- Posts: 2555
- Joined: Tue Aug 10, 2010 6:38 pm
- Zip Code: 35630
- Circle of Safety: Y
Re: Cylinder compression
From my experience I would say 90 to 150 psi it will run. They need to be close across the board . If not the really low one will be the problem.....probably a stuck valve if anything.
Regards,
Chase
205-368-5339
ihfarmallrtr@gmail.com
Follow my page "Alabama Tractor Pickers" on YouTube & Facebook!
Chase
205-368-5339
ihfarmallrtr@gmail.com
Follow my page "Alabama Tractor Pickers" on YouTube & Facebook!
-
- 5+ Years
- Posts: 40
- Joined: Sun Sep 24, 2017 7:33 am
- Zip Code: 10517
- Tractors Owned: IH Cub 1972
Mahindra 2615HST
Ariens GT16
Sold- Oliver Super 55 - Location: Mohegan Lake,NY
- Contact:
Re: Cylinder compression
First tractor was 70 in front cyl and 80 other 3.
"I have nothing to do today and by noon I want to be half done"
1972 Cub
Ariens GT16
Mahindra 2615
1972 Cub
Ariens GT16
Mahindra 2615
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- 10+ Years
- Posts: 4974
- Joined: Fri Oct 29, 2010 11:34 pm
- Zip Code: 36558
- Tractors Owned: Cubs: (3)'49's, (1 is for parts), (1)'57 IH Cub LoBoy w/FH, (2)154 Number Series Loboys, (1 is for parts), '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, '47 & '49 Avery V, '53 MM BG (offset), '51 JD M (regular), '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76? Yanmar 2TR15 1500 & Bush Hog SQ42S-2 mower, '78? FORD Dexta, '86 FORD LGT14D & 48" Mower, (2)Cub Cadets & Mowers (MTD), (4) Sears Surburban's, other MTD mowers, Jeeps & other misc. "treasures"
- Circle of Safety: Y
- Location: AL (Southwest)
Re: Cylinder compression
If it's been sitting for a while and not been run, the rings may be stuck. Seafoam in the cylinders and let set/soak for a couple days might help. Can't hurt anything. Before you try to start it, prime the oil pump and add Seafoam to the fuel tank also. Expect to have starting problems with the compression that low.
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
- txcublover
- 5+ Years
- Posts: 40
- Joined: Sun Oct 22, 2017 4:02 pm
- Zip Code: 00000
- Tractors Owned: 1951 Cub (141620)
- Circle of Safety: Y
- Twitter ID: farmallplay
- Contact:
Re: Cylinder compression
In the service manual available from this website it said compression should be 125PSI. I don't know about domed vs. flat, however.
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- Team Cub Mentor
- Posts: 20336
- Joined: Fri Jul 02, 2004 9:52 pm
- Zip Code: 65051
- Circle of Safety: Y
- Location: Mo. Linn
Re: Cylinder compression
I'm assuming you haven't purchased the tractor, yet.
Assuming you used the starter to crank over the engine, the dry PSI numbers are low. Although, the tractor would run with those numbers but be weak. I would like to see numbers over 100 and even.
Engine is probably due for an overhaul.
Assuming you used the starter to crank over the engine, the dry PSI numbers are low. Although, the tractor would run with those numbers but be weak. I would like to see numbers over 100 and even.
Engine is probably due for an overhaul.
I have an excuse. CRS.
- Glen
- 10+ Years
- Posts: 6095
- 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: Cylinder compression
Hi,
Below is the page from the Cub service manual showing the compression.
http://www.farmallcub.info/manuals/gss- ... 000-01.jpg
http://www.farmallcub.info/manuals/gss- ... 001-04.jpg
Below is the page from the Cub service manual showing the compression.
http://www.farmallcub.info/manuals/gss- ... 000-01.jpg
http://www.farmallcub.info/manuals/gss- ... 001-04.jpg
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- 10+ Years
- Posts: 7388
- Joined: Sat Jul 22, 2006 5:02 pm
- Zip Code: 00000
- Location: in northern usa
Re: Cylinder compression
Seafoam in the crankcase and gas tank will lube the valve guides freeing sticky valves, free stuck rings and reseat them. If only “IF” the tractor has been sitting. It’s not a engine rebuild or refresh in a can. But you will notice the rpm idle speed going higher.
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.
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- 5+ Years
- Posts: 40
- Joined: Sun Sep 24, 2017 7:33 am
- Zip Code: 10517
- Tractors Owned: IH Cub 1972
Mahindra 2615HST
Ariens GT16
Sold- Oliver Super 55 - Location: Mohegan Lake,NY
- Contact:
Re: Cylinder compression
Well it's been a long day. I looked at 3 Cubs today and the 3rd looks like a keeper. Good tires, runs nice, shifts well thru all gears, etc. Has the implements I want and the compression is 110 on all 4 cylinders. Now to get it home.
"I have nothing to do today and by noon I want to be half done"
1972 Cub
Ariens GT16
Mahindra 2615
1972 Cub
Ariens GT16
Mahindra 2615
- txcublover
- 5+ Years
- Posts: 40
- Joined: Sun Oct 22, 2017 4:02 pm
- Zip Code: 00000
- Tractors Owned: 1951 Cub (141620)
- Circle of Safety: Y
- Twitter ID: farmallplay
- Contact:
- Willy
- 5+ Years
- Posts: 519
- Joined: Sun Oct 22, 2017 4:54 pm
- Zip Code: 38330
- Tractors Owned: 1951 Cub Lil Red
- Location: Dyer, TN
Re: Cylinder compression
Sounds like a deal to me!
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- 5+ Years
- Posts: 40
- Joined: Sun Sep 24, 2017 7:33 am
- Zip Code: 10517
- Tractors Owned: IH Cub 1972
Mahindra 2615HST
Ariens GT16
Sold- Oliver Super 55 - Location: Mohegan Lake,NY
- Contact:
Re: Cylinder compression
With what little I know about Cubs and need to learn I hope so! Let the learning begin. May have to change my username!
"I have nothing to do today and by noon I want to be half done"
1972 Cub
Ariens GT16
Mahindra 2615
1972 Cub
Ariens GT16
Mahindra 2615
- Glen
- 10+ Years
- Posts: 6095
- 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: Cylinder compression
Hi,
You didn't say what year Cub you bought. It can be told from the serial number.
Below is a 1965 Cub owner's manual. You can learn lots about the Cub reading it. The experts on here recommend reading it, if you never have. It has lots of info about operation, maintenance, and lubrication. It has info for both 6 and 12 volt electrical systems, use the info for whichever system the Cub has.
It might not show some parts for a 6 volt Cub converted to 12 volts by someone. But many of those still have the 6 volt starter, from what pics I've seen on here.
http://farmallcub.com/rudi_cub/www.clea ... index.html
You didn't say what year Cub you bought. It can be told from the serial number.
Below is a 1965 Cub owner's manual. You can learn lots about the Cub reading it. The experts on here recommend reading it, if you never have. It has lots of info about operation, maintenance, and lubrication. It has info for both 6 and 12 volt electrical systems, use the info for whichever system the Cub has.
It might not show some parts for a 6 volt Cub converted to 12 volts by someone. But many of those still have the 6 volt starter, from what pics I've seen on here.
http://farmallcub.com/rudi_cub/www.clea ... index.html
- ricky racer
- 10+ Years
- Posts: 6303
- Joined: Wed Sep 12, 2007 8:40 pm
- Zip Code: 49120
- Circle of Safety: Y
- Location: Niles / Buchanan, Michigan
Re: Cylinder compression
We want pictures!!
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
-
- 5+ Years
- Posts: 40
- Joined: Sun Sep 24, 2017 7:33 am
- Zip Code: 10517
- Tractors Owned: IH Cub 1972
Mahindra 2615HST
Ariens GT16
Sold- Oliver Super 55 - Location: Mohegan Lake,NY
- Contact:
Re: Cylinder compression
Reading the manual is definitely on my list. I will get a printed copy for handy reference. The cub is a 73 based on the 242xxx serial number.
Pictures to follow.
Pictures to follow.
"I have nothing to do today and by noon I want to be half done"
1972 Cub
Ariens GT16
Mahindra 2615
1972 Cub
Ariens GT16
Mahindra 2615
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