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Compression problem
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- 10+ Years
- Posts: 149
- Joined: Thu Aug 18, 2011 7:37 pm
- Zip Code: 28685
- Tractors Owned: 1956 Cub
1946 Ford 2N
1958 Ford 861
1961 Ford 861
1965 MF 202 Industrial - Circle of Safety: Y
- Location: N/W North Carolina
Compression problem
I am new to the Cub site and have just gotten a 1956 Cub. It had not been running for about 2 years. I got it to start and it had a miss. The more I tried to fine tune it the worse it has gotten. I pulled the plugs and checked the compression 1 and 4 had about 90 lb. 2 and 3 10 to 0. Does this sound like a head gasket to you? I ordered the set and will be taking it apart next week if all goes well. It has no water in the cylinder or oil pan that I can see. Thanks for your help in advance. This is a great site for the NEW Cub owner
Last edited by ShineRunner on Sat Nov 05, 2011 8:58 am, edited 1 time in total.
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- Tractors Owned: two 47 two 48 53 and a 72 another 53
- Location: Roodhouse il
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- 10+ Years
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1949 Cub
1953 Cub
Kubota Zero turn - Circle of Safety: Y
- Location: Coopersburg, PA
Re: Compression problem
Test the compression again, do a wet test this time if it is still low, take off the valve cover and see if the valves are moving.
Go from there..........
Bruce T.
Go from there..........
Bruce T.
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- 10+ Years
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- Location: Ga, Cleveland
Re: Compression problem
Agree with the others stuck valves.
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[ Post made via Mobile Device ]
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- 10+ Years
- Posts: 149
- Joined: Thu Aug 18, 2011 7:37 pm
- Zip Code: 28685
- Tractors Owned: 1956 Cub
1946 Ford 2N
1958 Ford 861
1961 Ford 861
1965 MF 202 Industrial - Circle of Safety: Y
- Location: N/W North Carolina
Re: Compression problem
I will do the wet test and check the valves through the side plate before taking the head off. What is the best way to free up stuck valves? Having a great time working on this little red tractor. The engine sounds solid except for the miss. Thanks
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- Team Cub Mentor
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Re: Compression problem
Use the search function at the top of the page. There are several recent discussions on freeing up stuck valves.ShineRunner wrote:What is the best way to free up stuck valves?
You may not need to remove the head. It all depends on how stuck the valve(s) are.
I have an excuse. CRS.
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- Cub Pro
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- Tractors Owned: 1947 Cub "Granny"
1948 Cub "Ellie-Mae"
1968 Cub Lo-Boy
Dad's Putt-Putt
IH 129 CC
McCormick 100 Manure Spreader
McCormick 100-H Manure Spreader
Post Hole Digger
M-H #1 Potato Digger - Circle of Safety: Y
- Twitter ID: Rudi Saueracker, SSM
- Location: NB Dieppe, Canada
Re: Compression problem
Stuck valves
Why do I know this Dealing with the exact same problem with my 47 - Granny - here is the thread - Stuck Valves. Pull the plugs on 2 and 3, pour in 1 tablespoon of oil, rotate engine by hand a couple times. Take the side valve cover off. Spray the valves/valve springs and tappets with your favourite penetrating oil. I like Nut Buster and Loctite's Solvo-Rust. Rotate the engine by hand with/without hand crank again but while watching the valves functioning. You should see whether it is exhaust or intake valves that are sticking. Take a standard screwdriver and very.. very gently tap the offending valves once or twice. I used a dead blow mallet to reduce the shock to the valves. Spray the valves in the spark plug holes with your favourite penetrating oil. Rotate the engine by hand a couple times hopefully twice each cycle. Continue to do this until the valves drop and drop they will. They are just stuck up because of carbon/oxidation.
After the valves have dropped, add another tablespoon of oil to each spark plug hole and hand crank the engine again. When you feel the valves are moving freely, add some SeaFoam to both the gas tank and the crankcase according to the directions on the label. This will help clean the valves/valve stems and guides. It may still take a bit to get the engine to fire up, but this is the first step.
Why do I know this Dealing with the exact same problem with my 47 - Granny - here is the thread - Stuck Valves. Pull the plugs on 2 and 3, pour in 1 tablespoon of oil, rotate engine by hand a couple times. Take the side valve cover off. Spray the valves/valve springs and tappets with your favourite penetrating oil. I like Nut Buster and Loctite's Solvo-Rust. Rotate the engine by hand with/without hand crank again but while watching the valves functioning. You should see whether it is exhaust or intake valves that are sticking. Take a standard screwdriver and very.. very gently tap the offending valves once or twice. I used a dead blow mallet to reduce the shock to the valves. Spray the valves in the spark plug holes with your favourite penetrating oil. Rotate the engine by hand a couple times hopefully twice each cycle. Continue to do this until the valves drop and drop they will. They are just stuck up because of carbon/oxidation.
After the valves have dropped, add another tablespoon of oil to each spark plug hole and hand crank the engine again. When you feel the valves are moving freely, add some SeaFoam to both the gas tank and the crankcase according to the directions on the label. This will help clean the valves/valve stems and guides. It may still take a bit to get the engine to fire up, but this is the first step.
Confusion breeds Discussion which breeds Knowledge which breeds Confidence which breeds Friendship
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- 10+ Years
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- Circle of Safety: Y
- Location: OH, Sidney
Re: Compression problem
Eugene wrote:Use the search function at the top of the page. There are several recent discussions on freeing up stuck valves.ShineRunner wrote:What is the best way to free up stuck valves?
You may not need to remove the head. It all depends on how stuck the valve(s) are.
I agree, but if you are like me and have a new head gasket available, I would be just curious enough to want to see what things look like under that head on your new Cub. It makes getting to the valves much easier and you can clean all that carbon out of there. But that's just me.
Congrats on the new '56.
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- 10+ Years
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- Joined: Mon Jun 29, 2009 8:20 am
- Zip Code: 71836
- Tractors Owned: 49 cub buttercup
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- Location: foreman ar.
Re: Compression problem
i hope you are not planning on hauling shine with that cub, not very fast. welcome to the site. tomcat
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- Cub Pro
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5 lo-boys
1 154
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1 Oliver OC3 crawler
1 AC D10
1 IH 100 manure spreader
1 IH model B corn grinder
3 power units
cub demonstrator - Circle of Safety: Y
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Re: Compression problem
tomcat wrote:i hope you are not planning on hauling shine with that cub, not very fast. welcome to the site. tomcat
Not a problem, The revenooers would NEVER suspect a slow vehicle! Ed
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- 10+ Years
- Posts: 149
- Joined: Thu Aug 18, 2011 7:37 pm
- Zip Code: 28685
- Tractors Owned: 1956 Cub
1946 Ford 2N
1958 Ford 861
1961 Ford 861
1965 MF 202 Industrial - Circle of Safety: Y
- Location: N/W North Carolina
Re: Compression problem
I live only a few miles N of Junior Johnson in Wilkes County NC. I am in the Real Estate business now and Charlie Felts Jr. is one of the guys that I deal with now in the real estate business. His dad was one of the main revenuers (with the same name) when the product was in demand.
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- Cub Pro
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Re: Compression problem
I have been to Jr.s old shop. I think Flossie still lives there
Boss
Boss
IN GOD WE TRUST
All others pay cash
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Power corrupts; absolute power corrupts absolutely byJohn Emerich Edward Dalberg
All others pay cash
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Power corrupts; absolute power corrupts absolutely byJohn Emerich Edward Dalberg
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- Cub Pro
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- Location: VA. Randolph
Re: Compression problem
Have also been by his small new house
Boss
Boss
IN GOD WE TRUST
All others pay cash
Boss Hog
Power corrupts; absolute power corrupts absolutely byJohn Emerich Edward Dalberg
All others pay cash
Boss Hog
Power corrupts; absolute power corrupts absolutely byJohn Emerich Edward Dalberg
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- Cub Pro
- Posts: 10290
- Joined: Mon Oct 24, 2005 8:35 pm
- Zip Code: 23962
- eBay ID: dmb2613
- Circle of Safety: Y
- Location: VA. Randolph
Re: Compression problem
Must take a small army to tend to the grounds there
IN GOD WE TRUST
All others pay cash
Boss Hog
Power corrupts; absolute power corrupts absolutely byJohn Emerich Edward Dalberg
All others pay cash
Boss Hog
Power corrupts; absolute power corrupts absolutely byJohn Emerich Edward Dalberg
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- 10+ Years
- Posts: 5004
- 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: Compression problem
I agree with Rudi's instructions. I freed the valves (2) using this method on a 1952 Cub engine that had sat more than 30 years without being rotated. It took about 2 weeks of random tries, plenty of patience and penetrating lubricant. I like PB Blaster and ATF. (Using a wooden hardwood dowel instead of a screwdriver might keep from niching the metal.) Stan
EDIT NOTE: I was able to lubricate and tap the top of the valves through the spark plug hole after removing the hood.
EDIT NOTE: I was able to lubricate and tap the top of the valves through the spark plug hole after removing the hood.
Last edited by staninlowerAL on Sun Nov 06, 2011 8:55 am, edited 1 time in total.
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
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