Stuck valve?

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Dusty B
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Joined: Wed May 23, 2007 7:35 am
Zip Code: 61736
Tractors Owned: '45 SC Case
Circle of Safety: Y
Location: IL, Downs

Stuck valve?

Postby Dusty B » Sun Feb 05, 2023 7:10 pm

Getting around to evaluating the new Cub changed oil transmission fluid air breather gas tank compression Check 60, 110, 125, 0! . First gas is stuck valve! Any recommendations for checking that out or loosening it up without removing head? Pull valve cover and verfy non-movement? Also going to have to remove dried flaky crud from gas tank! With everything being dry is vacuuming a safe process? No sediment bowl only an in-line filter! That will be corrected!
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
God looks out for those of us who don't know how to look out for ourselves!

staninlowerAL
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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: Stuck valve?

Postby staninlowerAL » Sun Feb 05, 2023 8:14 pm

I had a similar situation on a non running cub that had sat in a barn for 30+ years. Penetrating oil of your choice into the cylinders and soaking the valves from the top and lower end after removing the valve cover, gently tap the stuck valve(s) from the top and bottom, needlenose vice grips to wiggle the valve stems and you should be able to eventually free it up. Oh yeah, a large dose of luck and patience, it probably won't happen right away. JMHO, Stan
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)

User avatar
Dusty B
10+ Years
10+ Years
Posts: 1882
Joined: Wed May 23, 2007 7:35 am
Zip Code: 61736
Tractors Owned: '45 SC Case
Circle of Safety: Y
Location: IL, Downs

Re: Stuck valve?

Postby Dusty B » Wed Feb 15, 2023 12:06 pm

Valve cover off, flat bar, bingo! valve popped down - 60# pressure dry! going to reinstall carb, run to warm up,ajust all valves and hopefully with seafoam in gas and oil sticky valve problem will disappear!
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
God looks out for those of us who don't know how to look out for ourselves!

staninlowerAL
10+ Years
10+ Years
Posts: 5042
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: Stuck valve?

Postby staninlowerAL » Wed Feb 15, 2023 8:18 pm

Be prepared for it to stick again until you can get some lubricant on the stem. Also MMO is a good additive for sticky valves, might make the engine smoke a little but that's to be expected.
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)

NJ Farmer
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Tractors Owned: 1953 F-Cub
1957 F-Cub
1956 Lo-Boy
1971 Cub Cadet 149
1976 Cub Cadet 1200
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Re: Stuck valve?

Postby NJ Farmer » Thu Feb 16, 2023 12:34 am

Use Marvel Mystery Oil in the fuel (at the correct mixture on label). Works perfectly since 1930’s for stuck rings or valves the AAC used it in WW2 on big radial engines! I swear by the stuff today in the fuel…..not in the oil that’s a different discussion altogether!

NJ Farmer

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Dusty B
10+ Years
10+ Years
Posts: 1882
Joined: Wed May 23, 2007 7:35 am
Zip Code: 61736
Tractors Owned: '45 SC Case
Circle of Safety: Y
Location: IL, Downs

Re: Stuck valve?

Postby Dusty B » Sun Feb 19, 2023 9:33 pm

Thinking a can of sea foam in pony tank and oil run it until everything is hot! compression did come up to 60# dry so do have hopes for it!
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
God looks out for those of us who don't know how to look out for ourselves!

Magnum
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Re: Stuck valve?

Postby Magnum » Tue Feb 21, 2023 5:16 pm

I have freed up my share of stuck valves , patients is key . I used lots of penetrating oil some home made some store bought In fact I have a barn find cub that was locked up , and had some sticky valves . With some time and patience it is now running and running real nice with no smoke. I think luck and an owner from 35 years ago took real good care of that one. In fact it's nearly finished a restoration which I will post pics of it soon .

MontanaMan
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Joined: Mon Feb 20, 2023 12:41 am
Zip Code: 59828

Re: Stuck valve?

Postby MontanaMan » Tue Feb 21, 2023 7:14 pm

Magnum wrote:I have freed up my share of stuck valves , patients is key . I used lots of penetrating oil some home made some store bought In fact I have a barn find cub that was locked up , and had some sticky valves . With some time and patience it is now running and running real nice with no smoke. I think luck and an owner from 35 years ago took real good care of that one. In fact it's nearly finished a restoration which I will post pics of it soon .

Cant wait to see it! I will be getting into my 1948 Cub soon......


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