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Kohler K341 Taper Coupler


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  #1  
Old 03-31-2011, 02:22:29 PM
KirkWallace KirkWallace is offline
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Default Kohler K341 Taper Coupler

I have a Kohler K341 I'd like to connect to a 10kW generator head. I would like to couple the shafts end to end or if needed the generator already has a three belt sheave on it, so a sheave for the engine could be another option. My problem is that the engine shaft has a 1.5" diameter shaft with a taper and woodruff key. I can machine a coupler, but I may be able to save some work by buying something that is already available. Does anyone know what might mate with this taper and be used for coupling to the generator head? Thanks.
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http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
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  #2  
Old 03-31-2011, 06:21:09 PM
K D Redd K D Redd is offline
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Default Re: Kohler K341 Taper Coupler

I could not find a picture of the engine in the links you posted. Could you post a picture of the K-341's output shaft with the tapered/keyed area. I have NEVER seen this on a K-series Kohler. Sound almost like you are speaking of the flywheel end of the crankshaft.

Kent
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  #3  
Old 03-31-2011, 08:44:05 PM
KirkWallace KirkWallace is offline
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Default Re: Kohler K341 Taper Coupler

Thanks for your reply Kent. I haven't taken any pictures yet. I assumed that my engine would be typical. I guess this is a reminder of what happens when one assumes. I'll get some pictures posted sometime tomorrow.
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Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
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  #4  
Old 04-01-2011, 08:22:06 PM
KirkWallace KirkWallace is offline
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Default Re: Kohler K341 Taper Coupler

I have the pictures here:
http://www.wallacecompany.com/machine_shop/Witte/

,but this is the best shot of the shaft taper:


I'm thinking about using this as part of the coupler:


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Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
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  #5  
Old 04-02-2011, 03:46:51 PM
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Default Re: Kohler K341 Taper Coupler

Just some advice, a K341 may have some trouble pulling a 10kw head at full load. It might do it, but it would he happier with an 8kw head.
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  #6  
Old 04-02-2011, 04:53:34 PM
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Default Re: Kohler K341 Taper Coupler

Standard rule of thumb for gasoline engine to generator sizing is 2 hp per kw. A 10 kw head should have 20 hp to drive it.
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Old 04-02-2011, 04:56:32 PM
K D Redd K D Redd is offline
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Default Re: Kohler K341 Taper Coupler

I've never seen a PTO on any small engine like that. Must have been something Very Special. By chance is the taper anywhere near the same as what the belt pulley with the tapered hub are?

Kent
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Old 04-05-2011, 08:21:16 AM
IHRick IHRick is offline
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Default Re: Kohler K341 Taper Coupler

kirkwallace, you need to find the spec # off the engine plate to see what application your engine was used for. that should tell you at least why that shaft is tapered. then you [U]may[U]be able to determine if you even can couple the shaft.
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Old 04-05-2011, 01:07:49 PM
KirkWallace KirkWallace is offline
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Default Re: Kohler K341 Taper Coupler

Kent, I measured the taper at .75" per foot. I measured the offset at the end of two scales, one on the straight part of the shaft and the other on the taper. It seems the standard is defined by considering the change in diameter over an axial distance, so my taper should be 1.5"/1'. QD bushings seem to be half that or .75"/1'. I'm not familiar with standard tapers that are 1.5"/1', but I can just machine whatever I need, it' s just a matter of how much effort I want to put out. I'm thinking more towards not using this engine because it really is too small for a 10kW gen. head.

IHRick, the engine data plate was removed sometime in the past. The only mark I have found so far is "K341" cast into the area just above the main bearing. It looks like the upper fan shroud is missing too.

I got the engine running. I'm surprised how smooth it runs considering that it's a large single cylinder. It's smoother than my Briggs 5HP. I'll certainly need to put it to work on something around here.
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Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
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Old 04-05-2011, 09:53:15 PM
manioso manioso is offline
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Default Re: Kohler K341 Taper Coupler

Looks like a standard European crankshaft extension. Used on lots of Lombardini, Hatz, and Acme engines. I've had Acme's on older BCS tillers that mount the cone clutch directly on the shaft and hold it in place with the Allen head bolt.
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Old 04-06-2011, 11:37:59 AM
Weezer Weezer is offline
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Default Re: Kohler K341 Taper Coupler

Why not just pop the crank out & turn it to a standard size?
Jim
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Old 04-06-2011, 10:57:05 PM
gpkull gpkull is offline
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Default Re: Kohler K341 Taper Coupler

kirk just a few dumb questions. 1 do you need the full 10k? 2 is the head a 2 or 4 or possibly 6 pole head. direct coupling may not be your best option here but watt do i know?
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Old 04-08-2011, 11:56:17 AM
KirkWallace KirkWallace is offline
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Default Re: Kohler K341 Taper Coupler

manioso: Thanks for your reply. Some generators I have taken apart have a taper on the engine shaft and a matching taper and no bearing on the armature shaft. I'm not sure if one can tell from other features on the engine what it was attached to.

Weezer: Or, another option is to weld up the taper and turn down to the 1.5" base diameter, but I have a real aversion to modifying stock machinery if I don't have to. A simple collar with the proper tapered bore should do it. I'm a little apprehensive about the key slot since I don't have a broach.

gpkull: The power goes off here quit a bit. I have a 2kW generator that can run the refrigerators, some lights and computers, but not the furnace. 4kW should make a big difference, but I'm not sure what kW would ever really be enough. I have 50Amps (240VAC or 12kw) going to my shop, so my 300Amp (70V or 21kW) welder is around 9kW under powered, a 20kW generator would be nice to fix this.

My 10kW head is rated for 1800 RPM so a direct couple would keep the engine at a reasonable RPM. Most generators these days run at 3600 RPM and are really annoying. The down side of 1800 RPM is the reduction in power, which is another reason I should really go to a bigger engine if I want to match the gen. head.

Hopefully the last of the snow has fallen here for this winter, which means the vegetable garden will need to be tended to. I may not have time to work on the generator for a while, but maybe a 20 HP diesel might come my way in the mean time.
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http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
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Old 04-09-2011, 12:25:50 PM
K D Redd K D Redd is offline
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Default Re: Kohler K341 Taper Coupler

But at 1800 RPM a K-241 is only going to produce about 8 HP/4 KW. The K-341 MUST turn 3600 RPM to make 16 HP. If you need about 8 KW from the 10 KW head you will need to belt drive the head with a 2 to 1 reduction to let the engine produce it's rated HP.

Kent
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  #15  
Old 04-11-2011, 11:31:12 PM
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Default Re: Kohler K341 Taper Coupler

Yeah, a K341 is only going to do 8-10HP max. @ 1800 RPM. 4-5kw useable power on a generator.
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Old 04-13-2011, 06:00:25 PM
KirkWallace KirkWallace is offline
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Default Re: Kohler K341 Taper Coupler

But an engine running at 1800 RPM is a lot easier on the ears than at 3600 and as a generator it could be running for a long periods of time. I'd rather go over a bit on engine size and keep the lower RPM. Another option is to use a super charger to bring the power back up. I think I'll be looking out for another engine for the 10kW head. I do have a 4kW 3 phase head that I could fit to the Kohler, so this project may still be in the works. I'll post pictures if I make any progress.
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http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
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  #17  
Old 04-23-2011, 12:49:02 PM
KirkWallace KirkWallace is offline
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Default Re: Kohler K341 Taper Coupler

I haven't had any time to work on my generator, but a question did come to mind. The starter motor gear does not come out all the way when I crank the engine. There is a spiral that is supposed to push the gear out, and I can pull the gear into full engagement by hand, but it won't do it normally. Is this a common Kohler K341 problem? Is there a fix?
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http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/index.html
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Old 04-23-2011, 05:35:54 PM
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Default Re: Kohler K341 Taper Coupler

Clean & lube the spiral shaft and see if that helps. Starter motor brushes might need cleaning too. Also need a good hot battery to throw the gear out smartly when it first starts spinning.
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