Before I pull the head.

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Rodney51Cub
10+ Years
10+ Years
Posts: 449
Joined: Fri Feb 11, 2011 6:06 pm
Zip Code: 62995
Tractors Owned: 1951 Farmall Cub
1950 John Deere A
1950 Case VAI
1944 Farmall H
1943 Farmall H
1940 Farmall H
Circle of Safety: Y
Location: Southern Illinois

Before I pull the head.

Postby Rodney51Cub » Fri Oct 29, 2021 4:26 pm

I bought this cub in 1996. When I bought it it had a lower engine knock. I had the crank turned and installed new rod and main bearings. I put a new set of rings in it also. Now 25 years later it smokes constantly but not heavy. It also has blow by out the dip stick but not heavy. It uses oil but not a lot. It did not happen all of a sudden, just more noticeable over the years. I thought it would be good winter project. It was our primary mower for about eight years mowing 3.5 acres. Now I only use it for pond banks and road side. It has been driven in a couple of parades and I do drive it to the neighbors once in a while about 2 miles one way. I am 98.6% sure I am going to go with new pistons and rings. It could use some tinkering in other areas.

DSCN1856-1.jpg


Compression readings
Cyl Dry / Wet
1 105 / 120
2 100 / 118
3 105 / 118
4 110 / 118

Spark plugs

DSCN2249.JPG


I know this will get a wide range of answers but...............

From compression readings and spark plug color what would you do ?

Thanks, Rodney

Eugene
Team Cub Mentor
Team Cub Mentor
Posts: 19665
Joined: Fri Jul 02, 2004 9:52 pm
Zip Code: 65051
Circle of Safety: Y
Location: Mo. Linn

Re: Before I pull the head.

Postby Eugene » Fri Oct 29, 2021 6:02 pm

Photo of spark plugs, a bit hard to see. Really didn't look bad. Dry cmpression is pretty good. Wet, very good.

Sea Form and continue to operate the tractor. I wouldn't overhaul the engine, just not yet. Maybe in another 10 or 15 years.

Operate the tractor more.

Just my opinion.
I have an excuse. CRS.

tst
10+ Years
10+ Years
Posts: 4693
Joined: Tue Jan 12, 2010 2:08 pm
Zip Code: 12514
Circle of Safety: Y

Re: Before I pull the head.

Postby tst » Fri Oct 29, 2021 10:39 pm

agree with Eugene, make sure of valve clearance, timing and point gap, then leave it alone,

inairam
5+ Years
5+ Years
Posts: 2360
Joined: Wed Jul 08, 2015 10:24 am
Zip Code: 19342
Tractors Owned: 1948 6v - Dozer
1949 with kub klipper belly mower. mag 6v - Mom
1950 with plow, 54 blade, mott mag 6v - Roxanne
1953 54 blade, c22, wood 42 6v
1957 6v - barn Queen
1965 lo-boy with c-3 mower 12 v - Loboy
1974 Horse II 12 v c-2
1975 with woods 42-6 12 v - Horse
1979 long strip 12 v stuck engine
130 with international 1000 loader 6 v
1969 140 with bush hog tow behind mower 12 v
Terramite T-6 4WD Backhoe Perkins diesel
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
Circle of Safety: Y
Location: Glen Mills PA

Re: Before I pull the head.

Postby inairam » Sat Oct 30, 2021 8:17 am

I think to do a good compression test you need to do a valve adjustment first and then do a compression test. Repost numbers after you adjust the valves and run some seafoam.

I agree with Eugene and Tim - it does not need the time or money spent on the engine at the moment
When you only have 9 horsepower you need to know the names of all of the ponies!

Rodney51Cub
10+ Years
10+ Years
Posts: 449
Joined: Fri Feb 11, 2011 6:06 pm
Zip Code: 62995
Tractors Owned: 1951 Farmall Cub
1950 John Deere A
1950 Case VAI
1944 Farmall H
1943 Farmall H
1940 Farmall H
Circle of Safety: Y
Location: Southern Illinois

Re: Before I pull the head.

Postby Rodney51Cub » Sat Oct 30, 2021 8:41 am

Valve adjustment was done in spring of this year and seafoam gets added to fuel occasionally. I will leave engine the way it is except new spark plugs. I have to do some carb, electrical, clutch and trans work so maybe I will have enough money left in the tractor budget to buy another one.

Thanks, Rodney

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Dale Finch
10+ Years
10+ Years
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Joined: Tue Apr 27, 2010 11:34 am
Zip Code: 27517
Tractors Owned: '51 Cub #140966 "Bruno" with Woods 59 mower
'55 Cub #187541 "Betty" with Fast Hitch
'55 Cub #190482 "Ben" with Woods 42 mower
'55 Cub #191739 "Bertha" with Woods 42 mower
'56 Cub #194370 "Boris" with Mott Flail mower
Circle of Safety: Y
Location: NC, Chapel Hill

Re: Before I pull the head.

Postby Dale Finch » Sat Oct 30, 2021 9:13 am

Rodney51Cub wrote:.....so maybe I will have enough money left in the tractor budget to buy another one.

Thanks, Rodney

That's ALWAYS a good goal!! :lol:
Dale Finch
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tst
10+ Years
10+ Years
Posts: 4693
Joined: Tue Jan 12, 2010 2:08 pm
Zip Code: 12514
Circle of Safety: Y

Re: Before I pull the head.

Postby tst » Sat Oct 30, 2021 9:33 am

I nice fresh tight motor is around 140-150 lbs of compression so those are not bad #s for an old one

Rodney51Cub
10+ Years
10+ Years
Posts: 449
Joined: Fri Feb 11, 2011 6:06 pm
Zip Code: 62995
Tractors Owned: 1951 Farmall Cub
1950 John Deere A
1950 Case VAI
1944 Farmall H
1943 Farmall H
1940 Farmall H
Circle of Safety: Y
Location: Southern Illinois

Re: Before I pull the head.

Postby Rodney51Cub » Mon Dec 06, 2021 2:56 pm

After deciding to leave the engine alone, other problems showed up. :evil:
I changed the oil in the finals and found metal particles in the left final. All new bearing, seals and shims, that is done. :D
Repaired choke linkage on carb. :D
Replaced toggle ignition to the oem style push pull switch. :D
Flushed radiator. :D
While out on a test drive it started missing and then died. Got it restarted and back to the barn and it died again. :evil:
Pushed it in the barn and called it a day. :(
Replaced the points because they were not hitting square and worn. That did not fix it. :censored:
It has new plugs so I tried a different rotor, condenser and cap. That did not fix it. :censored:
Tried a new coil. It fired right up and runs like it should. :{_}:
Now I can start the engine work on my 43 H. 8)
The coil was 24 years old so I think I got my moneys worth. Hope this one lasts 20 years. :tractor:


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