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Garden Tractors Discussion Forum

Re: best cub to buy & why

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Tom Arnold

11-07-2013 07:10:27
174.91.92.248



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The kit you are referring to is an aftermarket item and is not comprised of genuine OEM Kohler parts. There is a large difference in price. Some professional engine rebuilders refuse to gamble on aftermarket parts and insist on using only OEM Kohler parts. That fact will greatly affect the cost of rebuilding. Secondly, aftermarket kits sold on e-Bay do not include items such as valve guides, valve springs or main bearings.

Tell me. Are you able to examine a main bearing and determine how much life is left in it? I think not. Are you able to look at a valve spring and determine whether it is weak from age? Again, I think not. Springs must be measured and tested or valve performance will be affected.

Machine shop charges vary widely across the country. I don't know where the OP resides and neither do you. Therefore, what you paid to have work done is not germane to the issue here. The price I quoted was based upon a complete Kohler K being handed to a shop who would then have to dismantle that engine, degrease it completely, inspect all of the parts and then perform work that you do not even touch on. I don't consider what you did to be a proper rebuild. Did you put your engine onto a dynamometer when it was back together to see whether it made 14 HP or not?

Not likely. So you are just guessing as to how good your efforts were. But thanks for your reply because more than anything, you just illustrated the very point I was trying to make. The word "rebuilt" does not necessarily mean what you think it means.

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DaninKansas

11-07-2013 07:47:01
24.248.193.103



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 Re: best cub to buy & why in reply to Tom Arnold, 11-07-2013 07:10:27  
Agreed on the kit. Its actually better in most cases.



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Tom Arnold

11-07-2013 08:16:17
174.91.92.248



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 Re: best cub to buy & why in reply to DaninKansas, 11-07-2013 07:47:01  
Some people have good results with aftermarket parts. Others claim to have had failures. The problem here is that it is not possible to pinpoint the TRUE cause of the failure and perhaps the aftermarket kits get blamed out of convenience.

A couple of issues I did not address in my previous post are the governor gear and the balance gears. Both are known to fail on engines with high hours on them. If the governor gear fails, the engine can rev far beyond the 3600 RPM point and self-destruct as a result. Old balance gears can fracture and fall into the pan and make contact with the connecting rod. This can break off the dipper and that causes a lubrication failure that leads to engine failure. The gear can also end up causing catastrophic failure of internal moving parts which may lead to holes in the block, thus rendering it useless.

If an engine has 2000 hours on it, then every part in that engine has 2000 hours on it and is suspect. Experienced engine rebuilders have often learned the hard way about balance gears and governor gears. Just because someone gets away with not addressing those issues means that they were lucky. However, will that luck hold out until the next rebuild or will one of them come unglued and turn a good engine into scrap metal?

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DaninKansas

11-07-2013 09:49:38
24.248.193.103



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 Re: best cub to buy & why in reply to Tom Arnold, 11-07-2013 08:16:17  
I lost my taste for "Original" Kohler parts when the local repair guy showed me a rod he got from Kohler. The "big end" that goes on the crank journal was so oversized it would not clear the piston skirt. While the box might be made in America the contents where not even up to Chinese standards - looked more like something the North Koreans might manufacture.



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