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Minneapolis Moline Tractors Discussion Forum
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Trick???

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Jim W

11-05-2003 07:34:39




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Taking apart a 4-star 206L. What's the trick to get the crank out. The main bearing bolster has to move with it and there don't seem to be enough room...stuck in w/michigan jim




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SWMolines

11-05-2003 11:13:21




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 Re: Trick??? in reply to Jim W, 11-05-2003 07:34:39  
Sounds like you are still trying to pull the crank from the crankcase? Step 1: To pull the crank, I pull the distributor/oil pump drive to give the crank addition room to swing around inside the crankcase.

Step 2: With number 2 and 3 throw rotated forwards the side cover, the crank can be slide aft until No. 1 hits the center main support.

Step 3: The crank will then need to be rotated and tilted nose out ward to remove it out the back of the engine. Finding the exact rotational position is sometimes tricky and is easier if you have a person on each end of the crank.

Option: It is sometimes easier to remove the rear main housing after Step 2. Then the crank can be tilted and pulled throught the side cover openning. As Kevin wrote, removing the rear main housing from the crank can be equally frustrating. Sometimes the dowel pins are in far enough to remove the housing without pulling the pins. You will want to remove the bearing insert from the rear main housing before you try and pull it from the crank. Removing the insert will give you a little more clearance when every little bit counts.

Good Luck!

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Kevin Moschenrose

11-05-2003 09:34:14




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 Re: Trick??? in reply to Jim W, 11-05-2003 07:34:39  
Jim, You MUST remove one of the guide pins from the back of the crankshaft. The clearance is so close to fool a person into thinking it will come off. I just went though the same thing on a Jetstar. It is a bad idea of MM when it comes time to work on it.



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jim w

11-05-2003 11:17:27




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 Re: Re: Trick??? in reply to Kevin Moschenrose, 11-05-2003 09:34:14  
Kevin, is the guide pin able to be loosend or do you pound it out? And if so what direction? thankx jim



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Kevin Moschenrose

11-05-2003 23:26:40




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 Re: Re: Re: Trick??? in reply to jim w, 11-05-2003 11:17:27  
I had to remove one of my pins on my jetstar by clamping on a pair of vise grips. I had to heat it a little and then hit vise grips with a hammer and wiggle at the same time. I think JK is onto something as well about grinding a little off the pin. At a 45 degree angle and I don't think that since you will not be removing hardly any metal it wouldn't hurt it or put the crank out of ballance at all.

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JK

11-05-2003 18:38:01




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 Re: Re: Re: Trick??? in reply to jim w, 11-05-2003 11:17:27  
I usually just grind a little (at about 45 degrees)from the outside of the pin instead of taking it out. Saves a lot of hassle and doesn't seem to cause any problems. I suppose if you are concerned about it being out of balance, you could grind both pins. Or you might have to if you grind the wrong one first.
John



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Kelvin

11-05-2003 18:47:00




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 Re: Re: Re: Re: Trick??? in reply to JK, 11-05-2003 18:38:01  
The first 206 MM I worked on had 2 half-moon cutouts in the rear main bearing holder to clear the dowel pins. Ever since, I just take my die grinder and make my own cutouts.

I've never been able to take a 206 crank out the rear of the crankcase. I've always had to pull it to the rear, take the rear main bearing holder off and then take the crank out the side.



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