John Deere L120 motor blew up

wh312-8June 11, 2011

I recently traded a guy my Wheelhorse 312-8 for a 2007 John Deere L120. It had a 20hp Briggs and Stratton OHV Intek motor on it(model#406777). It had around 800 hours but was still running strong and wasn't smoking. two weeks later while im mowing, it starts making a grinding/rattling noise from the motor,then it made a popping noise and a dime-sized chunk came flying out of the block right behind the starter. Everywhere i have looked for a new or used motor it is $500-$700. Do you think i could rebuild my motor, or would i be better parting out the tractor? thanks

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mownie(7)

***"Do you think i could rebuild my motor?"***
NO!
***"would i be better parting out the tractor?"***
I don't have enough experience in how big the market demand is for used light line Deere's to advise one way or the other on that aspect of your situation.
Dime sized chunks flying out of the block usually demand around $1,000 (or more) to correct.

    Bookmark   June 11, 2011 at 9:42AM
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baymee(LehighValleyPA)

The Wheelhorse 312-8 could have lasted several lifetimes. You didn't know what you had!

    Bookmark   June 12, 2011 at 5:21PM
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wh312-8

I really liked the 312-8 but my mower deck was rotted and i could not find one that was in better shape, and i needed to mow grass! I wish i had not gotten rid of it

    Bookmark   June 14, 2011 at 4:27PM
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rcmoser

You can find used engines either on craigslist, LT junk yards, Flea markets, or ebay. I see them every now and then. Don't have to be that exact model if you have skills? If not better get the exact same one for easy installation.

Expect to pay at least $300 to $500 for good one and probably as mowie said grand or more for new one. Now the next question is it worth it to you to spend that much on LT got 800 hours? Me if I had freeby engine laying around would be the only reason I would fix it. but that's me.

    Bookmark   June 14, 2011 at 9:26PM
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tomplum

"Dime sized chunks flying out of the block usually demand around $1,000 (or more) to correct." I like that Mownie! It almost seems as though there should be a sliding scale as to coin size. Well, a quarter size hole will run ya... :)

    Bookmark   June 16, 2011 at 10:45PM
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mownie(7)

I know a grapefruit sized hole in a Detroit Diesel Series 60 block will cost you around $12,000. :^)

    Bookmark   June 17, 2011 at 12:52AM
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wh312-8

Everything else on the tractor is in really good shape. I'm not sure how it has 800 hours on it. The mower deck still has paint on the bottom of it. It looks almost brand new.

    Bookmark   June 19, 2011 at 7:57PM
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justalurker

You do see posts from people who left their key on and amassed a lot of hours...

    Bookmark   June 19, 2011 at 8:04PM
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wh312-8

I have a chance to get the same motor but 21HP the extra HP won't make too much of a difference right?

    Bookmark   June 22, 2011 at 11:34AM
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atschirner

Here's a new short block on flea-bay: http://compare.ebay.com/like/180617719119?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar&_lwgsi=y

    Bookmark   June 22, 2011 at 4:21PM
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