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Lawn-boy motor/crankshaft


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#1 RustyB ONLINE  

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Posted April 19, 2017 - 07:28 PM

I am looking for some opinions on fixing my lawn-boy engine. I have a 29 year old commercial series lawn-boy mower that I bought new. I hit a tree root and bent the end of the crankshaft. mower still starts and runs fine - except for the vibration. My question is would you buy a new crank...$131.00 plus shipping or buy a used crank off of EBAY...around $25.00. I don't really want to spend the $131.00 if I don't have to. I use this as a trim mower and it does a great job except for the vibration. What does anyone think about this? Thanks

 

Rustyb


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#2 Bolens 1000 ONLINE  

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Posted April 19, 2017 - 07:37 PM

Check your local mower shop, they may have a crankshaft straightener


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#3 CRFarnsworth ONLINE  

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Posted April 19, 2017 - 07:47 PM

Check your local mower shop, they may have a crankshaft straightener

What he said     . :iagree:      I have watched that procedure and it amazes me how much they can move the end of a crankshaft.    Rick


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#4 RustyB ONLINE  

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Posted April 19, 2017 - 08:10 PM

I didn't know it was possible to straighten a crankshaft. This is first bent one I have had to deal with. Still trying to figure out why it didn't shear the key off. I question weather anyone locally that can even help me. Thanks

 

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#5 propane1 OFFLINE  

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Posted April 19, 2017 - 08:19 PM

Try taking the blade off, turning it and put it back on. Worked on mine years ago. Hit something, had shake. Put the blade on the other way. No more shake. When I have the blade off, I have to remember to put it back on, the way it came off. That was in 1993, mower still works great.

Noel
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#6 RustyB ONLINE  

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Posted April 19, 2017 - 08:28 PM

Thanks Propae1-I appreciate the suggestion. I replaced the blade thinking it was the blade. The crank is bent enough that the blade rubs the deck/case slightly.

 

Rustyb


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#7 shorty ONLINE  

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Posted April 19, 2017 - 08:43 PM

I have several Lawn boys to fix right now. The one looks to be a parts machine that I will be parting out. If you get east towards Lancaster in about 2 weeks I might have one that would work for you.
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#8 boyscout862 ONLINE  

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Posted April 19, 2017 - 09:33 PM

Those crankshaft straighteners used to be common. I picked up one NIB at a tag sale years ago. It works with the engine assembled. It got lost in the basement. Ask around to find someone who does the straightening. Good Luck, Rick
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#9 EricFromPa OFFLINE  

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Posted April 20, 2017 - 02:20 AM

I straightened a few with a hunk of 2x4 and a couple good whacks with the 3lb hammer.Pull the spark plug out and spin the engine over while it's on it's side and use a yard stick to measure.

 

I bent the crank on my current self propelled push mower beating the blade adapter off so I could pull the belt cover off and replace the drive belt. It straightened rite out with a few good whacks.


Edited by EricFromPa, April 20, 2017 - 02:21 AM.

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