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Cylinder head from a 10 hp k241 Kohler fit the 14 hp k321?


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  #1  
Old 07-29-2010, 08:31 AM
flatfenders-n-flatheads flatfenders-n-flatheads is offline
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Default Cylinder head from a 10 hp k241 Kohler fit the 14 hp k321?

Hi, I have a rebuilt 14 hp k321 Kohler engine that I do not have the original cylinder head for. I do have a 10 hp cylinder head from a k241. The bolt patterns are the same on the heads, so provided the valves and piston clears the head when installed, is there a problem using the 10 hp head on the 14hp? Thanks in advance!

Daniel
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Old 07-29-2010, 02:38 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Cylinder head from a 10 hp k241 Kohler fit the 14 hp k321?

First, buy a head gasket for the 12 HP engine. Place it on the 10 HP head, and note if any metal from the head overlaps the gasket, into the combustion chamber. If it intrudes in the area of the valves, the head may hit the valve heads on the edges, when they open. If there is no overlap, procede to next section.

Get some plastiguage material. Place it on top of the valves. Install the head with a new head gasket, and GENTLY turn the crankshaft thru 4 revolutions. NOTE: I SAID GENTLY IF at any time you feel the engine resist turning, STOP! Remove head and look for contact areas. If it turns thru the 4 revolutions, remove head and check plastiguage for clearance. If you have more than .020 clearance, there should be no issues. Less than .020 may mean contact interferance if carbon forms within the combustion chamber, or possible contact when the engine gets hot (expansion). If all is well clearance wise, then the only thing to worry about would be alignment of the cooling fins with the starter shroud.

The only other way to check, is to contact a Kohler dealer, and check the part #s. The difference between the 10 and 14 may only be bore and stroke. They might use the same head.

Andrew
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Old 07-29-2010, 07:25 PM
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Mark Birdeau Mark Birdeau is offline
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Default Re: Cylinder head from a 10 hp k241 Kohler fit the 14 hp k321?

According to my JD parts book the heads are different but the head gaskets are the same.

JD part numbers; K321 engine, head M46788; K241 engine, head M44145;
gasket number M46787 for both

Mark:
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Old 07-30-2010, 12:08 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Cylinder head from a 10 hp k241 Kohler fit the 14 hp k321?

Thanks for the info Mark. There may be clearance issues between the heads, so if you follow my first post, GENTLY turn the crank, so if there is valve issues, it won't bend the valves. You may need to find a 14 HP head.
Andrew
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Old 07-30-2010, 03:09 PM
flatfenders-n-flatheads flatfenders-n-flatheads is offline
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Default Re: Cylinder head from a 10 hp k241 Kohler fit the 14 hp k321?

Sound advice fellas, thanks! I borrowed some playdough from my son to do some clearance tests, but didn't get to it yet. I'll try the plasti-gauge as well. It looks like I'll watch for another head even if the 10ho head does clear, maybe there are important differences that I don't know about, being different part numbers and all.

Daniel
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Old 07-30-2010, 06:45 PM
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Mark Birdeau Mark Birdeau is offline
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Default Re: Cylinder head from a 10 hp k241 Kohler fit the 14 hp k321?

I was thinking about the difference between them. I believe the placement of the spark plug is one thing and there may be others. I'll try to check tomorrow and see if I can tell without having to pull all the heat shields off.
(not easy to do on the ten HP)

Mark:
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Old 07-31-2010, 07:00 PM
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Mark Birdeau Mark Birdeau is offline
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Default Re: Cylinder head from a 10 hp k241 Kohler fit the 14 hp k321?

Checked the two heads. The spark plug placement is definitely different. Too big a job to remove the shroud but what is visible through the bolt access holes they appear the same on the out side except for the plug. I would guess with the difference in the plug placement that they wouldn't interchange with out some problems. Clearance most likely would be a problem and even if it wasn't the spark occurring in the wrong place would cause some problems.

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