Farmall Cub Engine Frozen

Farmall Cub Forum -- Questions and answers to all of your Cub related issues.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.

Farmall Cub Engine Frozen

Postby ecbrewster » Wed Oct 24, 2012 11:02 am

My 1947 Farmall Cub stalled while idling, seeming to have run out of gas. This was not the case, it had plenty of gas but would not restart. A check of the ignition system showed a very weak spark, so I proceeded to rebuild the magneto.

While attempting to manually re-time the engine by hand cranking, I noticed a slight resistance at one point in it's rotation until several revolutions later, the engine was locked solid and would not turn in either direction.

I have checked the following for the freeze up:
Starter motor, fan, generator, magneto, pto and all are free. This tractor has always been maintained, oil changed, and garaged so that the engine is not seized from rust. What else could it be?
ecbrewster
 
Posts: 9
Joined: Wed Oct 24, 2012 10:44 am
Zip Code: 02631

Re: Farmall Cub Engine Frozen

Postby tst » Wed Oct 24, 2012 11:25 am

Does it have electric start, if so I would pull the starter loose and make sure that it has not jammed the engine, also you could pull the plugs and see if it spins
Tim
tst
501 Club
501 Club
 
Posts: 1586
Joined: Tue Jan 12, 2010 2:08 pm
Zip Code: 12514
Circle of Safety Award
Circle of Safety: Y

Re: Farmall Cub Engine Frozen

Postby ecbrewster » Wed Oct 24, 2012 11:33 am

I have done both of the above. Thanks for the quick reply.
ecbrewster
 
Posts: 9
Joined: Wed Oct 24, 2012 10:44 am
Zip Code: 02631

Re: Farmall Cub Engine Frozen

Postby Chris D » Wed Oct 24, 2012 12:25 pm

Can you put it in 3rd gear and rock it?
Chris D
Cub Star!!
Cub Star!!
 
Posts: 397
Joined: Tue Nov 30, 2010 7:54 pm
Zip Code: 23027
Circle of Safety Award
Circle of Safety: Y

Re: Farmall Cub Engine Frozen

Postby Landreo » Wed Oct 24, 2012 12:27 pm

Clutch pushed in, does the engine turn?
Landreo
5+ Years
5+ Years
 
Posts: 956
Joined: Tue Oct 19, 2004 7:10 am
Location: SC, Ridgeway
Zip Code: 29130
Tractors Owned: fcub
1 cyl fcub
154
Earthmaster
JD 40MT
JD 420 crawler-loader
D-2 Cat dozer
AC Model C
Cub Cadets
Red-E
Circle of Safety Award
Circle of Safety: Y

Re: Farmall Cub Engine Frozen

Postby mrdibs » Wed Oct 24, 2012 1:06 pm

I just went through this. In my case a chunk of metal was between the piston and the head. When that cylinder reached TDC, it locked up the engine. Couldn't budge it until I loosened the head. Was a relatively small peice of debris that did it. Folks here said it can happen with a hunk of carbon breaking loose, busted ring, whatever. I too had tried everything else first, including rocking it in third.
mrdibs
Cub Star
Cub Star
 
Posts: 99
Joined: Tue Feb 21, 2012 11:02 pm
Zip Code: 19520
Tractors Owned: 1948 Farmall Cub
2007 Cub Cadet

Re: Farmall Cub Engine Frozen

Postby ecbrewster » Fri Oct 26, 2012 12:19 pm

I have also tried pushing in the clutch,but that didn't change anything. I didn't want to try rocking in gear yet, because I was afraid of doing further damage. I have studuied the Cub service manual in great detail, and reached the conclusion that the drive train is heavy duty and there shouldn't be a gearing problem in the front end, oil pump, or magneto drive.

The best suggestion to date, could be a piece of carbon or foreign material on top of one of the pistons. I'll probably pull the head at my next opportunity, unless I get any other ideas.

Thanks Everyone
ecbrewster
 
Posts: 9
Joined: Wed Oct 24, 2012 10:44 am
Zip Code: 02631

Re: Farmall Cub Engine Frozen

Postby Barnyard » Fri Oct 26, 2012 12:43 pm

If you do remove the head you always run the risk of breaking head bolts. Here are a few tips that have proved to be useful.
1. Apply a little penetrating oil such as PB Blaster ahead of time.
2. Use an impact wrench on low pressure and rattle each bolt for a bit
3. Turn the air pressure up a little at a time and alternate from bolt to bolt.
It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something.
- Franklin D. Roosevelt -

Barnyard Bash CubFest May 30th - May 31st, 2014
Click here for info http://www.barnyardbash.com
http://www.Savethecub.com
User avatar
Barnyard
Team Cub
Team Cub
 
Posts: 17876
Joined: Tue Aug 07, 2007 3:39 pm
Location: OH, New Haven (Hamilton County)
Zip Code: 45030
Tractors Owned: At This Time
40 Farmall Cubs (Round Hood)
2 Farmall Cub (Square Hood)
2 IH Cubs (Square Hood)
5 Lo-Boys (Round Hood)
2 Lo-Boys (Square Hood)
2 Farmall 404's
1 Farmall H
1 Ferguson 20
1 Cub Cadet 125
1 Kubota B-7100
Circle of Safety Award
Circle of Safety: Y

Re: Farmall Cub Engine Frozen

Postby Eugene » Fri Oct 26, 2012 1:02 pm

ecbrewster wrote:I have also tried pushing in the clutch,but that didn't change anything. I didn't want to try rocking in gear yet, because I was afraid of doing further damage.
Remove spark plugs, install solvent into cylinders. 3rd gear, rock the tractor backward. Won't hurt a thing since the engine locked up while hand cranking. Once engine frees up gently try the hand crank again. Will probably lock up again.
What else could it be?
Unknown. Can you roll the tractor when transmission is in neutral?
I have an excuse. CRS.
Eugene
Team Cub Mentor
Team Cub Mentor
 
Posts: 12528
Joined: Fri Jul 02, 2004 9:52 pm
Location: Mo. Linn
Zip Code: 65051
Circle of Safety Award
Circle of Safety: Y

Re: Farmall Cub Engine Frozen

Postby ecbrewster » Sat Oct 27, 2012 11:15 am

I can roll the tractor in neutral.
Thanks
The loose carbon seems to be the best shot. I once started a 70 Monte Carlo that has sat for several years and had it running when my brother goosed the engine and immediately it developed a loud knock. He thought that he had thrown a rod. We talked to a mechanic who listened and gave it another shot on the accelerator and the carbon blew out and the engine purred like a kitten.

Thanks again

PS Thanksfor the head bolt removal procedure!
ecbrewster
 
Posts: 9
Joined: Wed Oct 24, 2012 10:44 am
Zip Code: 02631

Re: Farmall Cub Engine Frozen

Postby challenger » Sun Oct 28, 2012 7:49 pm

If it is something in the cylinder, the engine should rotate backward through a reverse piston stroke until the object again contacts the head. Try to rotate the engine backward, trying, in this order of preference, the fan, while pushing against the fan belt, a screwdriver on the ring gear or carefully rotating a rear wheel slightly backward in third gear while you observe the fan to see if it moves.
User avatar
challenger
501 Club
501 Club
 
Posts: 965
Joined: Sun Apr 18, 2010 6:22 am
Location: Hagerstown MD
Zip Code: 21742
Tractors Owned: 1955 F Cub
1952 F Cub
1948 F Cub
2155 JD
216 JD
Circle of Safety Award
Circle of Safety: Y


Return to Farmall Cub

Who is online

Users browsing this forum: Bezirk, Jim Becker, ricky racer, tnestell, tst and 6 guests