kubota engine rebuild

Larry B · March 15, 2015, 07:29:18 PM

Too large contol panel to put in bay with gen

eagle19952 · March 15, 2015, 07:39:16 PM

Plug in an lectric (analog) clock... with a minute hand, get a good watch or stop watch.

when the clock and watch get to 1 minute at the same time under load....the rpm/gov will be set properly.
2 minutes 5 minutes or 60 minutes then you know.

luvrbus · March 15, 2015, 07:59:14 PM

Do you need the plugs in, the panel should be easy to rebuild smaller without all the plugs you can mount the controller and regulator any where

OneLapper · March 15, 2015, 08:25:23 PM

All sounds good so far. Yes, a fresh engine will have what you described as crankcase pressure until the rings seat. Power will increase as the engine breaks in so the RPM drop won't be as much, but there will still be a fair amount.

I have my gen set for 62hz no load but it'll drop considerably under a heavy load.

Just a note: My 8kw will not start a 13k AC unit on one leg (rated at 33amp per leg). I rewired for 66amps 120 and it'll start and run both AC units just fine.

TedCalvert · March 16, 2015, 05:22:44 AM

Regarding engine speed and Hertz:

Are you sure that engine is rated to run 3600 rpm? Most diesel gensets use a 4-pole alternator, which requires 1800 rpm to produce 60 Hz. I probably missed a post or two here and don't know the whole story, but I would'nt want you to damage your engine.

TedCalvert · March 16, 2015, 05:30:20 AM

Donald:

Neat idea on speed-setting using analog clock.

bobofthenorth · March 16, 2015, 07:48:46 AM

X2 on the speed setting kudos.

TedCalvert · March 28, 2015, 06:37:09 PM

to LarryB, the original poster:

How did this project wind up? Everything work out good?

TomC · March 28, 2015, 08:25:00 PM

If this is a synchronus direct drive alternator, then you use a hertz meter to determine engine speed. No load should be about 63hz. Full load no less than 59hz.
If this is a inverter, variable speed genset, then whatever the engine needs to run. Good Luck, TomC

RJ · March 28, 2015, 09:11:44 PM

Quote from: OneLapper on March 15, 2015, 08:25:23 PM
I have my gen set for 62hz no load but it'll drop considerably under a heavy load. Just a note: My 8kw will not start a 13k AC unit on one leg (rated at 33amp per leg). I rewired for 66amps 120 and it'll start and run both AC units just fine.

Mark -

Too bad my time in CT was so limited, you probably could have helped me figure out my cantankerous genset!

OneLapper · March 29, 2015, 09:57:06 AM

Quote from: RJ on March 28, 2015, 09:11:44 PM
Mark -

Too bad my time in CT was so limited, you probably could have helped me figure out my cantankerous genset!

Hey RJ,

Yeah, too bad you didn't have a day or two to park at my place and spend some time sorting out the genset. I still think you'll need to rewire it to a single 120vac leg. I have had no luck running my 8kw unit setup on two 33 amp legs. It just doesn't handle unequal loads and will trip out when it tries to start either one of the AC units. When I rewired the head to a single 66 amp leg everything started to work as needed..... well, almost everything. I ended up burning out the head but I'm not sure if it was because it was wet when I started it, or that I dropped a small washer into it. Either way, sparks flew.

I'll send you a PM about the manuals, lenses and glass soon.