Author Topic: Kubota EA300  (Read 1105 times)

Tanman

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Kubota EA300
« on: October 23, 2019, 02:40:15 PM »
There are three of these Kubota EA300s I have found for sale in my area for around $300-$500. Seems like a good deal, does anyone have any experience with them?
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old seagull man

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Re: Kubota EA300
« Reply #1 on: October 23, 2019, 05:38:54 PM »

Tanman

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Re: Kubota EA300
« Reply #2 on: October 23, 2019, 06:25:31 PM »
Thank you.
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hwew

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Re: Kubota EA300
« Reply #3 on: October 24, 2019, 05:05:23 AM »
Just updated the links for the service and parts manuals.

http://www.microcogen.info/index.php?topic=542.0

The original links would not open.
They should open up now.

Henry
« Last Edit: October 25, 2019, 08:26:59 PM by hwew »

hwew

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Re: Kubota EA300
« Reply #4 on: October 25, 2019, 09:13:12 PM »
The EA300 and EA330 engines are some of my favorites. Had one of each and they loved running between 2600 -2800 rpm. My opinion is both engines had more fuel knock below 2600 than I liked.

The EL300 is another one. They look almost the same.
The maximum rated rpm is 2000. I do know they are timed 22deg. BTDC. Probably to help with less fuel knock at lower RPMís.
There might be some internal differences. Never saw the inside of one.
The EL300 would be the one to find if someone is planning to build a small slow running genset.

The EA300 might be able to run at lower speeds like the EL300 by Setting back the timing 3-1/2 degrees. And setting the governor speed to 2000.
« Last Edit: October 25, 2019, 10:43:45 PM by hwew »

Tanman

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Re: Kubota EA300
« Reply #5 on: February 03, 2020, 02:29:43 AM »
I picked up a EA300 for $300, tore into it today and found that one of the valves wiggles a fair amount and the valve seat has worn a little. I have the manuals and part numbers. It seems like parts are a little tough to find, is my best shot my local Kubota dealer hunting some valves and valve guides for me?
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hwew

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Re: Kubota EA300
« Reply #6 on: February 03, 2020, 12:12:03 PM »
That might be your best bet. Kubota should be able to get them. While you have it apart it would be a good time to check the cylinder bore and if itís within spec hone the cylinder and re-ring the engine.

Just in case the bore is out of spec. There is an oversized piston and rings available.

Which guide is worn?

Do you have any idea of the hours on the engine?

Henry
« Last Edit: February 03, 2020, 12:29:52 PM by hwew »

hwew

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Re: Kubota EA300
« Reply #7 on: February 04, 2020, 01:49:44 PM »
Tanman, Just received a call from a friend in Jacksonville Florida that runs a shop that makes compact diesel generators for sailboats. They use Kubota engines only.

He knows the EA300 and EA330 very well. The company made Hundreds of units with those engines.
We talked about your situation and he explained to me that itís normally the exhaust valve guide that will get some wear over time. The intake valve guide normally donít give any problems but since the engine does not have valve guide seals there is a possibility of having oil sucked around the intake guide if itís very worn. This situation can be made worse with oil getting past the piston rings and if the air cleaner is restricted. He said there has been a few known cases of runaway engines but very rare.

He mentioned to replace valve guides, check valve stems and seats for wear, check cylinder and re-ring it and make sure the breather is functioning properly.

He mentioned that a good machine shop should clean up the seats. However the heads are known for rusting through on salt water applications so if it was a salt water engine check out the head thoroughly. If the head is bad a new one is available but itís around $500.00.

When I was visiting him years ago I saw a whole bunch of EA300 heads on a table that were just rebuilt. I ask him about those and his response was the market pretty much dried up. At times they good ones on eBay for rebuilding.

Henry

« Last Edit: February 04, 2020, 01:52:35 PM by hwew »