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Replacing a main bearing ?


 
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olivwers
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PostPosted: Mon Oct 01, 2012 8:35 pm    Post subject: Replacing a main bearing ? Reply to specific post Reply with quote

When doing an inframe overhaul (due to a broken sleeve leaking coolant), I was wondering if its possible to replace the main bearings without removing the crankshaft? Obviously the bottom half is easy, but is it do-able/possible to fit the top half of the bearing up there? I know both halves must match and I know its "best" to pull the crank but rods and main journals look and feel great (and rods measured up good and std size) and this tractor (Super 55) won't see more than 30 hours a year and I am on a budget.
 
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OLarry from MD
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PostPosted: Tue Oct 02, 2012 3:54 am    Post subject: Re: Replacing a main bearing ? Reply to specific post Reply with quote

Yes just loosen the mains and remove one cap at a time, then slip the old bearing out and the new in. Do not try to push the notch around the crank go the other way with the notch comeing out first.
 
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sdc eastern ia
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PostPosted: Tue Oct 02, 2012 5:39 am    Post subject: Re: Replacing a main bearing ? Reply to specific post Reply with quote

Have done it for years. Loosen up the main cap or sometimes you must loosen up two but remove one at a time. Rotate the bearing out notch side first, then reverse the procedure to slide in the new one. The thrust bearing can be a bear sometimes. Re-torque and a job well done.
 
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e
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PostPosted: Tue Oct 02, 2012 8:59 am    Post subject: Re: Replacing a main bearing ? Reply to specific post Reply with quote

A very typical procedure. In one of my service manuals, they specify making a "tool" by taking a cotter pin and smooshing the eye so the pin looks like a "t". Then, you can insert it into the oil hole in the crank, turn the crank, and it will roll the bearing out.
 
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J. Schwiebert
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PostPosted: Tue Oct 02, 2012 12:12 pm    Post subject: Re: Replacing a main bearing ? Reply to specific post Reply with quote

You are slipping!. Those engine don't have a drilled crank. We used a thin putty knife.
 
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e
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PostPosted: Wed Oct 03, 2012 6:48 am    Post subject: Re: Replacing a main bearing ? Reply to specific post Reply with quote

HA! When I was typing out my reply, I was wondering if someone was going to make note that the triple digits did not have drilled cranks for pressure fed rods. My intent for mentioning what I did was to demonstrate how common it is to roll in new bearings without pulling the crank.
 
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