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Old 09-22-2009, 12:21 PM   #1
gburnett
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Default Gravely Engine Swap

I have a 430 Gravely with a 12HP Kohler that runs good and a 816 Gravely with a bad engine.Can I put the 12HP Kohler out of the 430 in the 816?
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Old 09-22-2009, 12:24 PM   #2
Bushbuck
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Default Re: Gravely Engine Swap

when you remove the two engines if the shaft and the mounting plate is the same than yes you can.
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Old 10-02-2009, 01:30 PM   #3
gravelymay
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Default Re: Gravely Engine Swap

Hi
Short answer is NO
The 400 engines will fit the 2 wheel tractors with turned down Crank.
The 800 8000 and all the 8 speed trans are a like
Their Cranks are 1 1/8 X 3 1/2 to 4.00
Thanks Bruce g
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Old 10-02-2009, 07:03 PM   #4
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Default Re: Gravely Engine Swap

[QUOTE=gravelymay;834941]Hi
Short answer is NO
/QUOTE]

The 400 series engines will work on a walkbehind but not on an 800 or8000 series. Those engines are worth something as they are getting harder to find and there is no replacement. There are lots of engines that will fit an 800. Ed
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Old 10-02-2009, 07:41 PM   #5
gburnett
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Default Re: Gravely Engine Swap

Thanks for the information.So the run of the mill engines will fit the 800 series? I have an 816 that needs an engine and I had the good engine in the 430 I thought I might use.
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Old 10-02-2009, 11:52 PM   #6
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Default Re: Gravely Engine Swap

Gravelymay is the resident guru on replacement engines for the 800 tractors and others. He's had great success mounting Honda engines to these machines - he's well-versed in the needed adapter/bushing parts.
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Old 10-03-2009, 12:34 AM   #7
gm1276
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Default Re: Gravely Engine Swap

So you can't just put any K series on a walk-behind? I thought they all had the same shafts?
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Old 10-03-2009, 12:48 AM   #8
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Default Re: Gravely Engine Swap

The shafts are roughly the same size, but the crankshaft gears are different between the 400 series riders/walk-behinds and the 800 series. The first being a two piece stepped gear and the latter being more a "spider" shaped gear. On the walk-behinds, I believe the adapter plates are the same for most of the common K-series engines. That might include up thru and including the 16HP models, but I'd have to check on that.
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Old 10-03-2009, 06:39 AM   #9
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Default Re: Gravely Engine Swap

Quote:
Originally Posted by gm1276 View Post
So you can't just put any K series on a walk-behind? I thought they all had the same shafts?
Kohler made many diferent cranks, blocks, and oil pans for the old K's to fit diferent spec's.
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Old 10-03-2009, 06:34 PM   #10
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Default Re: Gravely Engine Swap

My crank for my 430 is stepped down for a polite bearing..
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Old 10-03-2009, 11:42 PM   #11
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Default Re: Gravely Engine Swap

The Tulsa Small Engine Warehouse is a pretty good source for replacement engine information - all the specs for the different K-series engines (and a whole bunch of others) are listed there.
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Old 10-04-2009, 02:59 AM   #12
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Default Re: Gravely Engine Swap

Quote:
Originally Posted by Kbeitz View Post
My crank for my 430 is stepped down for a polite bearing..
mine is too. Ed
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Old 11-03-2009, 12:36 AM   #13
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Default Re: Gravely Engine Swap

Quote:
Originally Posted by gm1276 View Post
So you can't just put any K series on a walk-behind? I thought they all had the same shafts?
They are completely different
The walk behind Kohler and the 400 or 4 Speed is a step down shaft 7/8 to 3/4 on 3/4 of the end.
The 8 speed transmissiom takes a 1 1/8 X 3 3/4 to 4. in long
The Rider has a larger counter bore also.
Thanks Bruce g
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Old 11-03-2009, 07:11 AM   #14
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Default Re: Gravely Engine Swap

I did find a place that sell new engines with step down shaft for the 400's on the net...
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Old 11-03-2009, 07:13 AM   #15
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Default Re: Gravely Engine Swap

Quote:
Originally Posted by gburnett View Post
Thanks for the information.So the run of the mill engines will fit the 800 series? I have an 816 that needs an engine and I had the good engine in the 430 I thought I might use.
Current largest HP engine that will fit the 800/8000/-G transmissions is the B&S Big Block Vanguard 35 HP Then you can go down from there to anything larger than a 10 HP with the right crankshaft size. It isn't hard to make an adapter plate for the 8-speed tranny. You also need to make sure that the adapter will seal the cranksaft to engine area or adapter to crankcase areas.
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