Tried to remove flywheel and damaged crankshaft's threads

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  #1  
Old 09-17-06, 10:39 AM
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Tried to remove flywheel and damaged crankshaft's threads

I have a self-propelled mower with sheared flywheel key, so I tried to remove the flywheel to replace the key by tapping on the top of the crankshaft with a hammer after removing the nut. Unfortunately, a few threads are now damaged and I can't put the nut back on the crankshaft. Is there a tool for rethreading or can I just grind down the damaged threads?
 
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  #2  
Old 09-17-06, 11:11 AM
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Don't grind anything until you've tried repairing the threads. Either borrow or buy a tap & die set that has a die for the correct thread size & shaft size.
Or, buy a thread chaser type gadget, (it's adjustable for many sizes) and clean up the threads. If it's damaged too badly they might not be repairable.
 
  #3  
Old 09-17-06, 11:24 AM
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One other tool: a thread file.


http://w6rec.com/duane/bmw/exhaust/file1.JPG

http://www.nolansupply.com/lgimages/36231236.jpg
 
  #4  
Old 09-17-06, 01:23 PM
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kbalona:

I took a trip Home Depot. They don't carry any large tap/die set for mower shaft size. They have smaller ones. Maybe I'll try a lawnmower repair shop tomorrow.

nap:

What's the thread file for? for repairing or removing threads?

Anyways, thank you both for your suggestions.
 
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Old 09-17-06, 01:50 PM
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The thread file is used on damaged threads to clean up the thread itself.

You have to use the correct file (correct threads per inch) and use it to clean up the threads. Real handy when you cannot get a die the correct size.

It is in essence a thread chaser but one that you use as a file rather than spinning it on like a die.
 
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Old 09-17-06, 03:50 PM
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Sorry for my ignorance but I have no idea what a thread chaser is or how to use a thread file. From looking at the pictures you posted, my initial thought was using it to remove threads. I couldn't find instructions on google.com. I found several ads on Ebay for thread files but no instructions. If you have a web link on this, please send.
 
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Old 09-17-06, 04:14 PM
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I'm trying to figure out the shaft diameter and thread size. What I have from the mower (Craftsman) are the model # 917.377543 and serial # 022599M 030578.
 
  #8  
Old 09-17-06, 04:37 PM
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What I posted previously was the mower model number. Here is the engine model number: 143.996510. Engine family is WTPXS.1951BA. Displacement: 195
 
  #9  
Old 09-17-06, 04:38 PM
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Forgot to mention that it's a Tecumseh engine, I think, it looks line a Tecumseh. For sure it's not a B & S.
 
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Old 09-17-06, 04:53 PM
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Originally Posted by kfcm78660
I have no idea what a thread chaser is or how to use a thread file. . If you have a web link on this, please send.

http://www.sandsmachine.com/guide_t.htm
 
  #11  
Old 09-18-06, 03:17 AM
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It is a Tecumseh engine and the thread size is 1/2"-20 (SAE). Depending on the depth of damage, you may be able to taper-file the end of the crank and still maintain sufficient thread coverage to get a full nut in place. Next time use a knockoff tool or at least install the flywheel nut back on to flush with the end of the crankshaft.
 
  #12  
Old 09-18-06, 09:02 AM
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Originally Posted by kfcm78660
I have a self-propelled mower with sheared flywheel key, so I tried to remove the flywheel to replace the key by tapping on the top of the crankshaft with a hammer after removing the nut. Unfortunately, a few threads are now damaged and I can't put the nut back on the crankshaft. Is there a tool for rethreading or can I just grind down the damaged threads?

FYI, In the future if you need to use a hammer on the end of anything that is threaded put the nut on the end and hammer on the nut not the threaded portion
 
  #13  
Old 09-18-06, 09:09 AM
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Yep, I tried to fix a problem, but ignorantly created a bigger problem. I still can't get the flywheel off and am looking to buy a flywheel puller. Will visit Harbor Freights later today for the right tools for the job.

Thanks for your suggestions.
 
  #14  
Old 09-18-06, 06:28 PM
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You can order one from you're local NAPA store. 5 or 6 dollars each. Ask to see the Outdoor power products book. Lots of cool stuf in it for shop tools=) Roger
 
  #15  
Old 09-18-06, 06:38 PM
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I got the flywheel off and the bent threads fixed!!! Got the flywheel off with a $10 general purpose puller and the threads fixed with a $25 40-pc tap and die set from Harbor Freight Tools. It took all but 5 min. I love it when I have the right tools to work with and most of all, the very helpful do-it-yourself community. THANK YOU ALL who responded to my question!
 
  #16  
Old 09-19-06, 09:26 AM
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Thumbs up

Glad it all worked out. Next time use a rubber hammer
 
  #17  
Old 10-15-06, 01:48 PM
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i found a factory puller for briggs on ebay http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=150029429063&category=50371

probably many for tecumseh on there too
 

Last edited by fast68; 10-15-06 at 02:06 PM.
  #18  
Old 10-15-06, 02:04 PM
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you need a special flywheel puller, you should be able to get one at most Briggs & Stratton Dealers, or you can order on line from the Briggs website or sears.com
 
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