Hi All,
I just ran a compression check on the Cub that I bought last week.
As I supected, the engine was not rebuilt durning an earlier restoration.
I noticed that it has a good bit of blow by out of the dip stick tube.
The compression numbers I got were, 60,60,58,55.
I'm just curious as to what is a normal reading for a Cub.
Thanks,
Ron
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Engine Compression
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- 10+ Years
- Posts: 80
- Joined: Sat Feb 08, 2003 11:23 am
- Location: Columbus, Georgia
Engine Compression
1951 Farmall Cub
- John *.?-!.* cub owner
- Cub Pro
- Posts: 23701
- Joined: Sun Feb 02, 2003 2:09 pm
- Zip Code: 63664
- Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
- Location: Mo, Potosi
A recently overhauled engine will normally run about 115 to 125. 85 is useable, but will burn a little oil and be low on power. 65 is hurting. If the cub has been setting for an extended period, try putting some Sea Foam (available at many auto parts stores) through it to help free up the rings. Another test is to squirt a littl oil in the cylinders and take readings again. If pressure goes up, the rings are probably sticking or worn. With as low a readings as you have given, more than likely the block will need bored and new pistons installed, rather than just installing rings.
If you are not part of the solution,
you are part of the problem!!!
you are part of the problem!!!
- artc
- Cub Pro
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- Joined: Sun Mar 30, 2003 10:25 am
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- eBay ID: cmtelephone
- Tractors Owned: Restored: 1950 Cub, 1950 Cub Demo, 1948 super AI, 1935 Silver King, 1946 Oliver 60 RC, John Deere M, 1950 C demo.
In working clothes:
1950 cub, 1948 cub, 1941 A, 1948 H, 1963 B414, 1958 240U, 1947 Oliver 60 industrial, Oliver 70 industrial. IH 450, 1963, another 1948 cub, 1946 I6 with Trogan front blade. - Location: CT, Middletown
- Contact:
John *.?-!.* cub owner
had to respond to this one Perfect avatar
Ron: sounds just about the compression readings i got on my '49 cub. in my case, i got lucky. the previous mechanic in the engine installed standard rings on .030 pistons, zero wear after the .030 bore job so i just replaced rings, verified that there were new, correct bearings, did the valves and seats, etc. there was soo much blow-by, the oil was collecting in the dipstick cap and dripping out.
So, have fun! Motor job ! Grease time !
Might be more enjoyable than seat time
had to respond to this one Perfect avatar
Ron: sounds just about the compression readings i got on my '49 cub. in my case, i got lucky. the previous mechanic in the engine installed standard rings on .030 pistons, zero wear after the .030 bore job so i just replaced rings, verified that there were new, correct bearings, did the valves and seats, etc. there was soo much blow-by, the oil was collecting in the dipstick cap and dripping out.
So, have fun! Motor job ! Grease time !
Might be more enjoyable than seat time
'If they're tappin', they're not burnin'
http://www.ZagrayFarmMuseum.org
http://www.ZagrayFarmMuseum.org
- EZ
- 10+ Years
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- Joined: Tue Feb 11, 2003 6:33 pm
- Zip Code: P0M1Z0
- Tractors Owned: 49 Cub
67 International Cub Loboy
57 Farmall 130 - Location: Northern Ontario
Yeah, great av, John.
Ron, I agree with artc, you may have what was only a poor mech. job. You most certainly will have to "go in" now. I did mine last year and it was not that bad of a job. The worst part I found was getting motivated. Get a good service manual, measure you clearances, measure your bores etc..
I started by dropping the pan, (that's fun!), pull the head, and removed one piston, #2, it was the worst. I found the cylinder wall scored, from then on I learned alot of stuff about these great little engines.
Oh yeah, while in there I lapped the valves and this also improved things greatly.
Ron, I agree with artc, you may have what was only a poor mech. job. You most certainly will have to "go in" now. I did mine last year and it was not that bad of a job. The worst part I found was getting motivated. Get a good service manual, measure you clearances, measure your bores etc..
I started by dropping the pan, (that's fun!), pull the head, and removed one piston, #2, it was the worst. I found the cylinder wall scored, from then on I learned alot of stuff about these great little engines.
Oh yeah, while in there I lapped the valves and this also improved things greatly.
Just Do It !
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- 10+ Years
- Posts: 80
- Joined: Sat Feb 08, 2003 11:23 am
- Location: Columbus, Georgia
Cub Comperssion
Thanks for the replies!
I kind of like engine work so this will be interesting.
I'm hoping that I don't have to bore it. It would be much less work to just hone it and install new rings and bearings. But, considering the age it will probably have to be bored.
All my mx experience has been with automobiles. What is involved in bracing up the tractor when you remove the block?
Any tips would be appreciated!!
Ron
I kind of like engine work so this will be interesting.
I'm hoping that I don't have to bore it. It would be much less work to just hone it and install new rings and bearings. But, considering the age it will probably have to be bored.
All my mx experience has been with automobiles. What is involved in bracing up the tractor when you remove the block?
Any tips would be appreciated!!
Ron
1951 Farmall Cub
- Rudi
- Cub Pro
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1968 Cub Lo-Boy
Dad's Putt-Putt
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Ron:
The service manual describes it quite well. I am hoping that George, BD, Ralph or some of the other pro's on the board will write an article on it with pics so I can post it. That would be a very useful article - step by step with photo's would surely help those of us who have never done this before.
Any takers
The service manual describes it quite well. I am hoping that George, BD, Ralph or some of the other pro's on the board will write an article on it with pics so I can post it. That would be a very useful article - step by step with photo's would surely help those of us who have never done this before.
Any takers
Confusion breeds Discussion which breeds Knowledge which breeds Confidence which breeds Friendship
- artc
- Cub Pro
- Posts: 1871
- Joined: Sun Mar 30, 2003 10:25 am
- Zip Code: 06457
- eBay ID: cmtelephone
- Tractors Owned: Restored: 1950 Cub, 1950 Cub Demo, 1948 super AI, 1935 Silver King, 1946 Oliver 60 RC, John Deere M, 1950 C demo.
In working clothes:
1950 cub, 1948 cub, 1941 A, 1948 H, 1963 B414, 1958 240U, 1947 Oliver 60 industrial, Oliver 70 industrial. IH 450, 1963, another 1948 cub, 1946 I6 with Trogan front blade. - Location: CT, Middletown
- Contact:
Rudi i'll send you a pic of the splitting stand i made quick one night when i needed it. post it to this thread, if you would.
i intend to weld another piece on the uprights to catch both holes and add more forward/backward stability. i intend it for use on my 'A' also, with higher holes. the holes for the cub are set 1 inch higher than the cub normally sits on the ground, so you can easily remove the front end.
i'm sure there's a few out there.
i intend to weld another piece on the uprights to catch both holes and add more forward/backward stability. i intend it for use on my 'A' also, with higher holes. the holes for the cub are set 1 inch higher than the cub normally sits on the ground, so you can easily remove the front end.
i'm sure there's a few out there.
'If they're tappin', they're not burnin'
http://www.ZagrayFarmMuseum.org
http://www.ZagrayFarmMuseum.org
- EZ
- 10+ Years
- Posts: 1185
- Joined: Tue Feb 11, 2003 6:33 pm
- Zip Code: P0M1Z0
- Tractors Owned: 49 Cub
67 International Cub Loboy
57 Farmall 130 - Location: Northern Ontario
artc,
That picture of yours has inspired me. I will be doing alot of work on my '67 Loboy soon. I want to tear it down, strip and repaint. I also will be swapping out the timing cover as the one on it has been "bubble-gummed". The ears that hold the fan assembly had broken, lots of big gobs of brazing, and the fan is sitting very crooked. I think this one will take awhile. I also did a '44 A 2 years ago. I miss that one, I sold it to fund my new passion for the Cub and Loboy.
Ron, as you know, doing mech and body work etc....patience is the key. You can see the end product in your mind, it just takes awhile getting there. Especially when you have a family and lots of commitments. 12 more years 'til retirement for me.
That picture of yours has inspired me. I will be doing alot of work on my '67 Loboy soon. I want to tear it down, strip and repaint. I also will be swapping out the timing cover as the one on it has been "bubble-gummed". The ears that hold the fan assembly had broken, lots of big gobs of brazing, and the fan is sitting very crooked. I think this one will take awhile. I also did a '44 A 2 years ago. I miss that one, I sold it to fund my new passion for the Cub and Loboy.
Ron, as you know, doing mech and body work etc....patience is the key. You can see the end product in your mind, it just takes awhile getting there. Especially when you have a family and lots of commitments. 12 more years 'til retirement for me.
Just Do It !
- parts man
- 10+ Years
- Posts: 619
- Joined: Wed Jul 30, 2003 9:41 pm
- Location: Sussex N.B. Can.
- Contact:
Art, I like the splitting stand,simple and effective, good show!!
This will probably make you all laugh, but we just use large 10x12 blocks, with some bottle jacks. We don't have an engine stand yet either! That is one investment I do plan to make as rolling 40-50 engines around the floor each year to dismantle them gets OLD real quick!!
This will probably make you all laugh, but we just use large 10x12 blocks, with some bottle jacks. We don't have an engine stand yet either! That is one investment I do plan to make as rolling 40-50 engines around the floor each year to dismantle them gets OLD real quick!!
V.P. of T.S.A. (taking stuff apart)
- EZ
- 10+ Years
- Posts: 1185
- Joined: Tue Feb 11, 2003 6:33 pm
- Zip Code: P0M1Z0
- Tractors Owned: 49 Cub
67 International Cub Loboy
57 Farmall 130 - Location: Northern Ontario
- parts man
- 10+ Years
- Posts: 619
- Joined: Wed Jul 30, 2003 9:41 pm
- Location: Sussex N.B. Can.
- Contact:
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