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Arrgh, cracked the end of my crankshaft...

kohler

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#1 gears OFFLINE  

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Posted July 16, 2020 - 11:16 AM

So I'm rebuilding my JD 216's Kohler 16hp K341 and when I went to pull the flywheel using my trusty old, pry and smack method I cracked the end of the crankshaft off! Right at the base of the threads, gone! AND, the flywheel was still tightly pressed onto the crank.

 

I called a guy in MO who sells rebuild kits and he said he can drill and tap the end of the crank for a 3/8 grade 8 stud and that will hold the flywheel on fine. I've got a lathe, why not drill and tap myself?

 

Anyone else run into strange things rebuilding engines? This is my first Kohler, that cam's a little tricky too.

 

Any advise or cautions?


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#2 WNYTractorTinkerer ONLINE  

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Posted July 16, 2020 - 11:51 AM

Sounds like a new crankshaft is in order..  I'd hate to have the flywheel decide to pop off when a repaired C/S let loose..  JMO


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#3 classic ONLINE  

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Posted July 16, 2020 - 12:04 PM

I've read where people have had this happen before. The later Kohler flywheels are retained with a bolt, so just drill and tap like you mentioned. The price of a new crankshaft will scare you and there's no need to replace it.

#4 MiCarl ONLINE  

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Posted July 16, 2020 - 12:11 PM

Yamaha had a heat treating problem on some of their pinions on shaft drive bikes.  The thing would break at the base of the threads and the gears would howl because the shaft would drift and mess up the gear lash.

 

A friend turned me a guide to aid in hand drilling them.  Drill, tap, grade 8 bolt.  Never needed to open the gear cases.



#5 WNYTractorTinkerer ONLINE  

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Posted July 16, 2020 - 01:49 PM

I've read where people have had this happen before. The later Kohler flywheels are retained with a bolt, so just drill and tap like you mentioned. The price of a new crankshaft will scare you and there's no need to replace it.

There are used ones available..   One I saw was $75



#6 DougT OFFLINE  

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Posted July 16, 2020 - 01:59 PM

I drilled the crank in a K181 and didn't have any problems. Never took it out of the engine.



#7 secondtry OFFLINE  

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Posted July 16, 2020 - 02:06 PM


I called a guy in MO who sells rebuild kits and he said he can drill and tap the end of the crank for a 3/8 grade 8 stud and that will hold the flywheel on fine. I've got a lathe, why not drill and tap myself?

 

Did exactly that on a Tecumseh 7 horse Worked fine. Hand drilled through the broken off piece into the crank. Clearance drilled the broken off piece and tapped the crank. The bolt was likely a grade five I never even looked.

Don

 


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#8 gears OFFLINE  

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Posted July 16, 2020 - 02:49 PM

Thanks guys, it's on the lathe in the garage right now - I've got it torn down for a rebuild anyhow so the crank is out and centered.


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#9 KennyP ONLINE  

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Posted July 16, 2020 - 04:59 PM

Sounds like it's time to quit using the "my trusty old, pry and smack method" !


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#10 426tractorguy OFFLINE  

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Posted July 16, 2020 - 05:50 PM

i used that method but only after the flywheel soaked in multiple sprays of bolt blaster and next time im getting a puller


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#11 secondtry OFFLINE  

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Posted July 16, 2020 - 09:21 PM

Sounds like it's time to quit using the "my trusty old, pry and smack method" !

I used the pry and beat method starting before I was in my teens. when I purchased my first John Deere, a 70, More money invested than in any other mower i ever had. That is the one I used a puller on very carefully. It is also the only one I ever broke.

Don


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#12 classic ONLINE  

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Posted July 16, 2020 - 10:16 PM

@WNYTractorTinkerer. I had no idea that you could buy a used crankshaft. Learn something new every day. I have lots of used crankshafts that can't be used without a trip to the machine shop. Hard to find machine shops to turn them around here anymore. The closest place to me is an hour away and 130.00 to turn it .010. Then there's the cost of him buying the used crank for 75.00 and a new rod. Just went through this with a buddies knocking K341. Some idiot installed the rod cap backwards on the rod and wiped the crankshaft and rod out.
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#13 BHamby OFFLINE  

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Posted July 16, 2020 - 10:24 PM

Kustom I think they are in ohio will turn it. They mine last year. Wasnt very expensive. Shipping wasnt bad either.
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#14 4getgto ONLINE  

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Posted July 17, 2020 - 06:45 AM

Can honestly say I never seen or heard of a crank breaking off at the flywheel end.
And I smacked on a good many of them...🤔

#15 WNYTractorTinkerer ONLINE  

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Posted July 17, 2020 - 12:48 PM

@WNYTractorTinkerer. I had no idea that you could buy a used crankshaft. Learn something new every day. I have lots of used crankshafts that can't be used without a trip to the machine shop. Hard to find machine shops to turn them around here anymore. The closest place to me is an hour away and 130.00 to turn it .010. Then there's the cost of him buying the used crank for 75.00 and a new rod. Just went through this with a buddies knocking K341. Some idiot installed the rod cap backwards on the rod and wiped the crankshaft and rod out.

WOW-  a comedy of bad luck..  Sounds like something that would happen to me!







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