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We've got a 12.5kw Kohler generator on our 1974 GMC bus conversion. It is the original genset that was installed by Custom Coach in 1974, and it has only about 900 hrs on the meter. It's powered by a Perkins diesel. Both the Kohler generator and Perkins engine are working fine at the moment, and I'm determined to do what I can to keep it that way. The same shop that works on the bus engine has gone through the Perkins and done with was necessary to get it ready. There were a few minor issues which came from not being used enough over the years, but it seems to be doing fine right now. They've replaced a few gaskets that were leaking oil, replaced a weeping water pump, and right now are replacing the four mounting pads which have become too hard to be of use. Otherwise the Perkins seems to do exactly what it should. I've recently been in touch with someone who used to work at Custom Coach when these coaches were converted, and he advised me that one of the routine maintenance items they recommended was to change the main bearing at the rear of the Kohler generator head at regular intervals of about 250 hours. That's a pretty frequent replacement cycle, but it seemed like he had a reason for the recommendation. Since I have no idea how long ago the bearing that's in place was installed, I'll assume that it's the original. That makes it time to replace it. So now the question. Does anyone have experience changing the bearing that can give me an idea of how big a project this is going to be? It's my understanding that many Wanderlodge coaches used the same genset, as did some earlier Prevost conversions, so I'm hoping that I'm not the first one in FMCA that's attempted this task. Any advice would be appreciated. A copy of the service manual for the Kohler 12.5kw generator head would also be great - the only ones I've found online either don't have the necessary information or have such degraded quality that they're unusable. Thanks!