Posted by D Slater on November 01, 2012 at 11:50:18 from (18.104.22.168):
In Reply to: 1951 M crank? posted by DC3puller on November 01, 2012 at 09:28:59:
Standard rod journal size for M tractors that have a crank cast number ending with D, DA, DB or DC is 2.4975 to 2.4985. DD or DE suffix cranks have bigger journals. Same connecting rods work with both cranks. Bearings are just different thickness. You have the small journal crank and if round, smooth and no taper it should be fine. Just get bearings for a engine below the serial number break. Off the top of my head I think its engine # 278050 in a M tractor.
.006 max. clearance was allowed on a used crank if not egg shaped or more than .0015 differance in diametter across the journal. If that checks out .0045 would be better to stay at or under. Measurements of all parts is the only way to know whats needed. Should be able to use standard or .002 bearings though. Lots of old M tractors running over the ideal new clearances. If its going out and work all the time and needs to last to the next piston or ring job, ideal may be the best.
This post was edited by D Slater at 16:29:27 11/01/12.
Same-Day Shipping! Most of our stocked parts ship the same day you order (M-F). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a Company you can trust and have generous return policies! Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ More Info ]
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.