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Onan Emerald Plus 4000


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  #1  
Old 05-25-2015, 07:49:47 PM
Vanman Vanman is online now
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Default Onan Emerald Plus 4000

Hello Guys,

This generator set came with my bus that I will be outfitting for RV service. I won't be using it in the bus, but would like to learn more about it. It's missing it's fan shroud, and I fear that that may have been where it's identification was located??

I've had it running one time after borrowing a fuel pump, and it did generate. I've since learned (from you guys) that I very likely put it's AVR in peril. I won't run it again without disconnecting it until the collector rings are cleaned.

Here are some photos:
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Old 05-25-2015, 07:52:00 PM
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Default Re: Onan Emerald Plus 4000

Maybe only one photo at a time?
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Old 05-25-2015, 07:55:49 PM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan Emerald Plus 4000

Don't think you hurt anything. Most of the damage was done with dirty rings under load. I will check my surplus parts warehouse (junk pile) for a shield.
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Old 05-25-2015, 08:00:58 PM
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Default Re: Onan Emerald Plus 4000

As it happens it was under load. The set was still mounted in the bus at the time and the A/C unit came on when it started.

For some reason I just can't get that third photo uploaded. It's just a view of the top.

Keith
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Old 05-25-2015, 09:51:11 PM
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Default Re: Onan Emerald Plus 4000

Quote:
Originally Posted by vanman View Post
Hello Guys,

This generator set came with my bus that I will be outfitting for RV service. I won't be using it in the bus, but would like to learn more about it. It's missing it's fan shroud, and I fear that that may have been where it's identification was located??
It has electronic ignition so it could be from the late 90's to early 2000's. I have a 2001 and everything looks the same except mine is LP Vapor. If you find a serial number somewhere and post it, I'll look at mine and compare.
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Old 05-25-2015, 10:05:58 PM
len k len k is offline
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Default Re: Onan Emerald Plus 4000

You gen looks nice, the aluminum is not all oxidized white. You must be in a dry place. Here water condenses on them after cold nights.

Being 4kw its a BGE model, NHE is 6.5kw.

Since it doesn't have a big transformer voltage regulator by the starter it's spec D or newer.

I looked at the parts manual, found following:

Specs E, F (and likely D also) have breaker points box for spark coil, so if electronic ignition it's spec G or newer. If that white wire tube goes into top of genset it likely is electronic.

Look at the control board part number: According to parts manual following specs came from factory with these part numbers. This method for all following could be wrong if someone replaced control board or other parts, but it's a reasonable guess

300–3950 Spec E–G
300–3763–01 Spec H–M
300–4901–01 Begin Spec N

--------------------

Also part number on R6, the battery charging 25 watt Resistor, by the starter is

304–0794 Spec F–J
304–0797 Begin Spec K

Also coming off that resistor starting spec k is a diode bridge rectifier, part number 305–0718
.

Last edited by len k; 05-25-2015 at 11:05:17 PM.
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Old 05-25-2015, 11:13:49 PM
Vanman Vanman is online now
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Default Re: Onan Emerald Plus 4000

Thanks Len,

The set is stored quite a ways from here, but I will check those part numbers the next time I am there, and report back to this thread with the findings.

Keith
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Old 05-26-2015, 12:33:39 AM
len k len k is offline
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Default Re: Onan Emerald Plus 4000

Good to know what spec your gen is , but as a practical matter part numbers for many items are the same for all specs, so for those items spec number doesn't matter. Check the parts list to see if it call out different part numbers for different specs
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Old 04-19-2017, 02:29:18 PM
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Default Re: Onan Emerald Plus 4000

Quote:
Originally Posted by Vanman View Post
Hello Guys,

This generator set came with my bus that I will be outfitting for RV service. I won't be using it in the bus, but would like to learn more about it. It's missing it's fan shroud, and I fear that that may have been where it's identification was located??

I've had it running one time after borrowing a fuel pump, and it did generate. I've since learned (from you guys) that I very likely put it's AVR in peril. I won't run it again without disconnecting it until the collector rings are cleaned.

Here are some photos:
I have a fan shroud for you if none else does.
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