Super A crankshaft help

Woodby · May 28, 2013

I am rebuilding the engine on a 1950 super A and need help. I need to measure the main bearings to order the proper replacements and I need to know how to remove the crankshaft. Tractor is split and flywheel and clutch are off.

steve alderman · May 28, 2013

probaly going to need to take motor off you need to take the rear oil seal out and will need to take the front cover off in order for that crank to drop down

teddy52food · May 28, 2013

Those engines are so simple, just unbolt whatever is in the way. You may need a puller on the front pulley. Mark the mains so you get them back exactally as they were. Don't mix up the rod caps either.

CharlieNJ · May 28, 2013

You should have an engine stand. Then you can turn the engine upside down, although you could do it on a bench. Remove the front pulley. Remove the oil pan. Remove the oil pump. Remove the timing cover, Remove the rear main seal carrier. Check the top of the cylinder liners for a ridge, cut it out if necessary. Remove the piston connecting rods one at a time, notice the numbers that are on the cam side. Keep the piston rods and caps in the same position and bolt them together hand tight. Remove the main bearing caps, taking care to keep them in order and same position. Now, the crankshaft should now lift out. Measure the crankshaft journals at two locations each, 90 degrees apart. If they are in spec, get some Plasti-gauge and measure the bearing clearance between the crank and the old bearings. Any questions?
Regards,
Charlie

El Toro · May 29, 2013

Once you have the crankshaft removed take the crankshaft to your local auto machine shop and have them measure it for wear. It may just need polishing and they won't machine it unless it needs it. Also buy your bearings from them. I would install a new sleeve kit while you have it torn down. Hal

P and R Pete · May 29, 2013

I rebuilt my SA engine, and took a bunch of pictures, if any of them will be helpful.

Have a machine shop check your crank. Mine had a crack unseen by the naked eye, and I had to find a good used one.

Rootsy · May 29, 2013

(quoted from post at 17:52:45 05/28/13)
I am rebuilding the engine on a 1950 super A and need help. I need to measure the main bearings to order the proper replacements and I need to know how to remove the crankshaft. Tractor is split and flywheel and clutch are off.

Have one apart right now with a broken crankshaft. Since it is split and the flywheel is off you are about 1/4 of the way there. The front pulley is the real PITA to contend with. They can be a bear to remove. Once it is off, remove the front cover and the rest is easy, just unbolt the rods and push the pistons down in the bore. Remove the cross struts on either end that support the pan. Rear main assy unbolts, it is two halves, remove main caps and the crank lifts out. Will have to remove the oil pump also (2 bolts on outside of block and it pulls out).

Woodby · May 30, 2013

Thanks everybody I'm working on it as time allows. I have an engine stand and am getting ready to dive in.

Woodby · May 30, 2013

I have the engine off and on the stand. Can't get the front pulley off.

Janicholson · May 31, 2013

Look in the archives. That pulley is a nasty interference fit. It takes a good bearing splitter behind the pulley, and a very good puller or more likely a hydraulic powered puller. A U shaped 5/8 thick plate with 3/4" drawbars and a hydraulic jack is often needed. I have seen some take 25,000 pounds of force to pull. See archives (twice) Jim

Rootsy · May 31, 2013

(quoted from post at 20:50:11 05/30/13) I have the engine off and on the stand. Can't get the front pulley off.

I use a large bearing splitter, 2 pieces of threaded rod, a heavy cross bar and a 4 or 8 ton hydraulic jack... Don't use a finger type puller, you will break the pulley.

Tom Fleming · Jun 1, 2013

Heavy bearing splitter and a 12 ton, 2 jaw puller works for me. A little heat doesn't hurt either, but don't go crazy with the torch. First 2 I ever had done, I took to the CaseIH dealer. Basically, big bearing splitter, big puller, and a 1" impact wrench. Spun 'em right off. Dealer charged me $50 per crank to take them off, so I invested in the tools.. I don't do lots of C113 or C123 engines, but the few I do get, it was worth the investment.

Plus, I use the splitter and heavy puller for other things now as well. Get the right tool for the job, and it will come off.

Super A crankshaft help

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Woodby

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