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How to fix popper FLYWHEEL/CRANK splines

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ellis brasher

07-14-2003 17:49:03




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I fixed a 520 in 1983 that was messed up real bad and I believe it is better than when they came from the factory. Let me know if anyone wants to know how.




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ellis brasher

07-14-2003 19:39:06




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 Re: How to fix popper FLYWHEEL/CRANK splines in reply to ellis brasher, 07-14-2003 17:49:03  
In 1982 I bought a 520 out of a junk yard to rebuild and it had a lot wrong with it including a very loose flywheel (FW). I priced a crank and FW at the JD house at about $850 so that started serious thinking. I had a friend that had a large lathe and he charged about $35 for the required machine work. You may know that the FW side main is 2.249" dia. and that the crank must be able to slide in the pressed in main. Now you must measure as close as possible how much of the crank sticks out of the FW with the so called lock nut off and with the FW set for the minimum thrust clearance which is .005".
The first thing I did was use some mild steel weld rod and weld in and fill in the grooves of the splines on the crank and even put at least one pass on the spline lands. Be sure to protect the main bearing surface. It doesn't matter if you mess up the threads on the end of the crank and in fact it is better to just weld over the threads. I then let the machinest machine where I had welded to the same size as the main bearing and then machine off the end of the crank the amount that was previosly measured.
The next thing is to remove the FW starter gear and have the machinest use the starter gear lands to line up the FW in the lathe and then bore it so that it will just barely slide on the machined end of the crank with the two tightening bolts removed.
Now comes the hard part. Assemble the crank in the main bearings with the thrust washer in place. Set the crank so that No. 1 is on TDC and figure out a way to secure it at this point. Install the slinger/spacer and related parts and then slide the FW on the crank, install, but do not tighten the FW bolts. Next install the FW cover so that you can the turn the FW on the crank so that the timing marks line up for TDC. This is important due to the FW having balance weights built in. Once you get it timed, carefully tighten the FW bolts to barely secure it; and the machined face of the FW should be even with the end of the crank. Now you must hand drill and tap 6 holes for 3/8" N.C. socket head cap screws. Evenly space 3 on each side of the FW parting crack. Drill at the parting line between the FW and crank and keep in mind the crank is harder than the FW so the bit will try to wander to the FW. Start with new bits, use a 5/32" first then 1/4" and then 5/16" which is the final size. And you should have a regular and a bottoming tap. It doesn't matter if the drill bits wander off a little and they do not need perfect spacing.
Drill and tap as deep as possible without going past the inside face of the FW. Before tapping be sure to recheck the thrust clearance and correct before tapping if needed. The last thing you will do is tighten the FW holding bolts. Mine has been running 20 years and I did let it get loose about 8 years ago and I then drilled out 3/8" and tapped for 7/16" cap screws and kept poppin.

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John D

07-15-2003 17:39:42




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 Re: Re: How to fix popper FLYWHEEL/CRANK splines in reply to ellis brasher, 07-14-2003 19:39:06  
Ellis, my brother had a 1950 B and flywheel came loose, an old blacksmith told us how to fix by basically doing the same thing as you did, we loosened the flywheel bolts drilled and tapped in several bolt holes around the crank and flywheel, screwed in the bolts and tightened the flywheel, it worked for as long as my brother had the tractor.



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ellis brasher

07-15-2003 20:32:07




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 Re: Re: Re: How to fix popper FLYWHEEL/CRANK splin in reply to John D, 07-15-2003 17:39:42  
John D>"Ellis, my brother had a 1950 B and flywheel came loose, an old blacksmith told us how to fix by basically doing the same thing as you did, we loosened the flywheel bolts drilled and tapped in several bolt holes around the crank and flywheel, screwed in the bolts and tightened the flywheel, it worked for as long as my brother had the tractor."
I thought about trying the same route, but I could never convince myself that it would wind up centered on the shaft and then might be out of balance. When mine was completed I set up a dial indicator on the starter gear land and it indicated .0005 (1/2 a thousandth) low in two places 180 degrees apart. These two low places were in alignment with the two tightening bolts.
I discovered something while working on this flywheel; with it laying on the floor I put the dial indicator inside the splines and at a right angle to the slot. I could the take my thumbs and forefingers and squeeze in the direction that the bolts are and you could see the indicator needle move. And I weigh 160# with a wet overcoat on.;-)
By the way I saw a 730 Diesel that had been fixed the same way I did except only a single piece of 3/8" cold roll was installed at the parting line. I don't think I would have trusted just one piece, especially on a diesel.
I will mention how I fixed another part on the 520 power steering. I took it apart and found the valve actuator about the size of a pencil had two helixes made on each side of the shaft and on side was broke off. It looked like it might have been made out of the same stuff that a valve stem is which is tough. I kept looking at and decided I got nothing to lose; I'm gonna try to weld it up and grind it. I used some 310 stainless and arc welded in the broke off place and then eyeball ground it to look like the other side and it has ran for 20 years.

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MIke

07-15-2003 05:13:45




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 Re: Re: How to fix popper FLYWHEEL/CRANK splines in reply to ellis brasher, 07-14-2003 19:39:06  
I would recommend to any one with this problem 1st choice get a good used crank and flywheel and install. 2nd choice get a taperlock flywheel and install
on worn crank these work very good and you don't have to tear tractor apart.



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Bus Driver

07-14-2003 18:05:14




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 Re: How to fix popper FLYWHEEL/CRANK splines in reply to ellis brasher, 07-14-2003 17:49:03  
Is this an ad or an offer to share helpful information? If information, pour it on. Always grateful for enlightenment. Thanks.



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