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Changing crankshaft

M

MAYNARD10

New User
I own a 1955 ferguson and I would like to put a 1951 crank in it. I have not found any differences in the motors. Can I go ahead?
 
Yeah, but. Coming from another engine, you will most likely need to have the set 'line bored' in a machine shop. Or the main bearings may/will bind up. This may or may not be cheap.
 
The 51 model would have a 129 CI engine, the 55 would have a 134 CI engine. Same stroke, different bore.

Look the end thrust bearing over, the 134 thrust is on the center main, not sure on the 129. Be sure the flywheel will bolt up, the pilot bearing hole and the seal surface is the same. That's the only difference I can think of that may be there, but don't trust me on that!

Did you find a casting number? Should be the same if it will interchange. Double check everything, especially the journal sizes.
 
Thks..It is a start. I tried to save the old crank but it had already been turned ounce. It was in bad shape..We tried new bearing but it still loses oil presure when it is fully warmed up. I just want it for a cottage tractor
(quoted from post at 07:06:57 06/29/16) Yeah, but. Coming from another engine, you will most likely need to have the set 'line bored' in a machine shop. Or the main bearings may/will bind up. This may or may not be cheap.
Click to expand...
 
I can still find some straight 50 oil but 10W50 did not work. How does it run... Two cranks and it runs. Zero smoke.
 
Thks will do. Did you ever hear of putting shims behind bearings to make up some clearance. I have 6 or 7 thou clearance. Way to much. It was an idea that I guess people have done when they can't get bearrings for older tractors.
 
(quoted from post at 20:13:26 06/29/16) Who is saying it is a 129 crank? It could be a 120 crank. It may still work but I am just saying......
Click to expand...

Richard is right, the Z120 was still being built in 1951. I have two 1951 TO-20's and that crank will not work with Z134 pistons. Compression height is different between the two. You need to get the casting numbers off of the crank and verify that it is a Z129 crank which will work. As far as low oil pressure how low? I've ran one with less than 10lbs when hot for years now, and I work it hard but it doesn't rattle. I'll eventually put a new motor on it, but it runs good even though it is tired so I'll leave it be be for now. But that's just me.
 
My TO 20 has shimms I added 45 years ago. Works for mew but hardly anyone does it any more.
For me it is time consuming but it works.
Crank can't be junk and not to far out of round. I pretty much only shimm new bearings to get desired clearance. Good Luck!
 
Thinking this over, line boring costs, thrust differences, Richard and Jason's thoughts on this crank possibly having differences that could bite back- if the engine is off the bellhousing, before you spend money on a dodgy crank- or just bring that along- to a machine shop who KNOWS what they are doing.
Within minutes while sitting in your truck bed, they should know what is the best route. Cranks that look shot to guys like us look do-able to an ol pro. I have had 2 cranks ground to the minimum, one needed special order bearings, but in the end they weren't any more expensive than cobbling up a 'might work' project. And the 202's Z134came out best of all. It was the worst I ever seen. The ol guy shrugged, and said 'come back tomorrow, it'll be fine.....bring 200 bucks'... a line bore could be 400...
 
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