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Tractor Pulling Discussion Forum

swapping cranks

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jdtruble

01-30-2004 10:29:58




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Has anyone switched cranks from a 1948 B into a 1940 B if yes what cahanges need to be made? (I want to use the bearing rods instead of the babbitt rods.)




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WTW

01-30-2004 17:37:31




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 Re: swapping cranks in reply to jdtruble, 01-30-2004 10:29:58  
Yes, I have done this. Not to tell you what to do but if you want to do it the easy way use a crank from a 1941-1946 vintage "B" as it will fit in without modification and has the same stroke as the 1948 vintage crank and you still can use the later insert bearing type rods on this crank. The 48 crank can be used but you will also have to use the clutch pulley, dust shield and driver from the 48 vintage tractor. The next problem with the 48 option is the clutch pulley has a different gear tooth count and outside diameter so you will have to take the gear from the original pulley to use on the 48 vintage pulley. The next problem the early gear from your original pulley will not fit the later 48 pulley so now you will have to machine the inside diameter of the original gear to match the outside diameter of the 48 pulley hub, then machine a key-way in it. Also the dust shield has to be modified to fit the old style reduction cover. It can be done but why make a big job out of something simple as using the 41-46 crank and all the parts from your 1940 "B" crank will fit the 41-46 crank including: Flywheel, Clutch pulley and Main bearings. Here is the best part, you have the optio to machine the 2 3/4" rod journal on this crank down to either 2 1/2" or 2 1/4" depending on desired stroke and end up with either a 5 3/4" or a 6" stroke. No clearance grinding required. Pretty simple and no extra effort to install. Let me know if you want some help or more ideas. Good Luck, Dave W.

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jdtruble

01-30-2004 18:38:27




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 Re: Re: swapping cranks in reply to WTW, 01-30-2004 17:37:31  
looks like I will look for a crank from a 41-46 B, where can I get inserted rods if I were to get the crank offset ground to a 2 1/2 or 2 1/4 dia, Thanks for the help.



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