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Allis Chalmers Discussion Forum

More problems on the crank on a '39 b

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Chris (OR)

10-05-2003 13:58:20

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Well I did some more poking at the crank on my '39 b (thanks for the earlier suggestions on end play...). I got the end play but now it doesn't want to spin freely once torqued. Plasti-gauge shows I have .001-.0015 but it looks like the bearing is taller than the cap... It sticks up a hair. There were no shims between the block and caps before but this is a new crank (last one was not salvagable). Do all block have some sort of shims in there? If I am getting .001-.0015 then do I need shims?

I also notice that the connecting rods are not symetrical. The only photo that I took shows only #3. It has the longer side back. If I set them all up that way then #2 and #4 rods do not fall in exactly the center of the piston. If I turn #2 & #4 rod around(so they are centered in the piston), then I am spining those two bearings backwards. From the markings(it was already marked with I ripped it apart), it looks like you end up running it with two rods not centered in the piston....

Chris Horn
Scappoose Oregon

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10-07-2003 21:00:54

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 Re: More problems on the crank on a '39 b in reply to Chris (OR), 10-05-2003 13:58:20  
Chris, as others have noted you need the Repair Manual. You should stop where you are on the rebuild, get the proper manual or manuals, study them in detail and then re-start your repair job. If not you are going to end up with a bad job that will come apart on you in a short while of using the tractor, and then all the expense and work again. Good luck.

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10-06-2003 22:40:24

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 Re: More problems on the crank on a '39 b in reply to Chris (OR), 10-05-2003 13:58:20  
use lubriplate grease on bearings dont use motor oil to lube new bearings . oil will sease the crank when bearings are torqued down . hope this solves your prob . ol ac mech from way back . good luck

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Dick L

10-05-2003 18:58:03

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 Re: More problems on the crank on a '39 b in reply to Chris (OR), 10-05-2003 13:58:20  
If you have torqued down with out shims you may need to file at a bevel on both ends of each insert. Pinching the bearings to tight can push bearing material at the end out toward the crank. This can cause the bearing to drag on the crank even after proper shimming to the .015 to .002 that the book calls for. You do need to read the manual about shimming and filing the bearing inserts for the proper crush. (Proper Crush) Not enough allows crud to get between the inserts, to much crimps the ends of the inserts. Proper shimming takes time and care to detail.

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Bob D. (La)

10-05-2003 18:48:39

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 Re: More problems on the crank on a '39 b in reply to Chris (OR), 10-05-2003 13:58:20  
Chris,I just finished up putting a C together and since they share same basic motor, I'm sure B will be the same. The manual states:"The connecting rod is offset and must be installed with the long side of offset turned away from the nearest main bearing". This works just like it was designed. HTH

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10-05-2003 17:58:04

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 Re: More problems on the crank on a '39 b in reply to Chris (OR), 10-05-2003 13:58:20  
.001 is too tight. you need .002 to .003 inch on the rods and crank. The bearings originally had .006 (3 times .002) shims on each side of each bearing cap, rod and crank. as the bearing wears you take out a shim. PLastigauge is o.k. for a test . but the real test is will it roll. Do 1 bearing on the crank at a time. torque and roll the crank to chekc for easy rolling. if not, add 1-2 thous shim. The bearing does stick up .007 above the cap. it is a crunch fit with the .006 shims installed. if you take out .004, then you need to file .004 off the end of one bearing to keep the crunch the same. you are also correct about the rods. two are backward, i dont have the book right now, but 2 and 4 sounds correct. the offset makes the rods line up on the crank. if you turn them 180 degrees, the rod will be in a bind on the crank. i agree, you should have a book, everything is explained in it, but you can wing it if you are carefull and follow the above.

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10-05-2003 17:48:34

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 Re: More problems on the crank on a '39 b in reply to Chris (OR), 10-05-2003 13:58:20  
You need to have a manual, would tell which way rods go in and about shimming bearings. But for bearings go to the archives. It is a somewhat long and involved job. Don't do it when you are in a hurry. To start put all upper shells in with the block upside down and lay the crand in. Now fit one bearing at a time, checking the rotation each time. Again, check archives, or if you can't find it get back to me and I will spell it out.

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