farmall re-build

[Farmall Flunkie]

What should the clearance be on the rod bearings. How do you know which size to order? .001 or .002 or something like that. I need help. I am going to order a complete rebuild kit and they asked me which size bearings. Thanks for the help.

 

[Janicholson]

Micrometer measurement is by far the accepted and best way to do the task. It takes a skilled and practiced hand to do it right. each journal must be measured in about 6 or 8 places in several directions across, and around to assure the accurate reading. Rod clearance is normally .0015" to .0025" Less is better (toward .0015") If you are a newbe at the measuring thing, get pro help. Bearings are called undersized to fit smaller shafts, the shells are thicker. JimN

 

[KEB1]

Actually, I'd take the crank out & have it measured before ordering new bearings. If the engine is worn, there's a pretty good chance that the crank will need to be reground, in which case you'd need to order undersize bearings to match the reground crank anyway. Another alternative is to order .010 undersize bearings and just plan on having the crank ground to .010 undersize to match.

Have the machine shop check the main bearing journals, which may also need to be re-ground.

Unless the rebuild kit includes new sleeves & pistons, you'll also need to pull the engine down far enough to check & see if the cylinders have been bored at some time in the past in order to get the right size rings.

Keith

 

[Kelly C]

What Farmall you rebuilding?

Dont order the kit until you know what you need.
I ordered mine early with standard bearings and ended up ordering undersized after I got it all apart.

If you are doing a inframe. Pull the pan and measure the rod jurnals and the main jurnals.
I know on a 560,706 gas you can replace the main bearings with out pulling the crank. Just put a brass nail in the oil hole in the crank and turn the crank and the top bearing spins right out.

You need a caliper to do the mesuring. Harbor freight has them for like $20. Hard to mesure the mains with the crank in though.
Also check the tapper on the jurnals. If one side is wore more than the other or out of round. You will need to pull the crank and get it reground.

On mine the #3 rod jurnal was plum wore out. Had to get it built up and reground. I ordered the proper bearings from the guy who ground the crank.

I would recomend that you buy the inframe kit with out the bearings and buy the right bearings as you need them. its possable you might need. 3 standard bearings and one 10 under.

Just take you time and you will do fine.

If you interested in my engine rebuild learing experience. You can check out my web site. Its in the section for a 706.

My Farmall web site.