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Onan Generators

Onan 2.5LK-1R/12L


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  #1  
Old 02-10-2018, 01:44:42 PM
Handyhiker1 Handyhiker1 is offline
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Default Onan 2.5LK-1R/12L

I just got home with my new toy. It is a little rough around the edges and missing a few parts but does run.
2.5LK - 1R/12L, C8110560059 are the numbers.
A question I have that kind of surprises me is that this has a round head generator. My 2.5LK that is 1977 vintage is a square head and this is a 1981 and has a round head.
1- Is it because the older one is 120/240 and this one 120 only?
2- Or is it because this is a pressure cooled and the older one is Vacuflo?
I did get a decent car battery with it but passed on the "fuel tank" that was with it. It was a drum with a valve welded into it and the weld leaked. A few pics.
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  #2  
Old 02-10-2018, 01:52:58 PM
Handyhiker1 Handyhiker1 is offline
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Default Re: Onan 2.5LK-1R/12L

A few ugly pictures. You can see some cut wires in the control box as well as the point cover is missing, just the gasket was there. Can't believe it ran as bad as they look. The feet are missing along with the air cleaner. Fuel line has been rigged. I am sure I will find more stuff wrong but for the price I couldn't pass or up.
Then there is this small metal tag just under the meter. Not sure if it was some kind of unit number.
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Old 02-11-2018, 07:57:16 AM
Kevin K Kevin K is offline
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Default Re: Onan 2.5LK-1R/12L

Both of my 2.5LK's are round head 120 volt only models.

Spec J made in April 1975 and was pulled from a Winnebago.

Spec N Utility Truck model made in March 1987. According to the seller this unit was pulled from a bus (???) and sat around his shop for years. The Spec N LK is the only one of the LK series to use pressure lubrication instead of the more common splash lubrication.

I always assumed the Spec N used a round head because it is a utility truck model and the exciter needed to provide 30 amps of battery charging current. But then again, who knows? I managed to find the production order and wiring diagram for your set.
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Old 02-11-2018, 08:21:24 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: Onan 2.5LK-1R/12L

Thanks Kevin,
So now this leads me to another question. On the generator it has instructions that say derate output for natural gas operation. This build sheet has a addition that says, CL -Comb. carb. It also shows the unit came with spark plug shield clamp and a spark plug shield.
Is this a factory tri fuel unit??
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Old 02-11-2018, 09:12:42 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: Onan 2.5LK-1R/12L

IF this is a tri fuel, the only spot I can see to plumb the gaseous fuel into the carb is this pipe plug. Does this sound right?
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Old 02-11-2018, 09:31:06 AM
David C David C is offline
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Default Re: Onan 2.5LK-1R/12L

The tri-fuel LK I have has the gaseous fuel connection at that location. If it is drilled like the picture, you just need a valve and some hardware.

David C.
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Old 02-11-2018, 09:34:43 AM
JohnnyC JohnnyC is online now
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Default Re: Onan 2.5LK-1R/12L

Handyhiker1, congrats on your new (old) LK. Great pictures. Your LK is almost identical to mine but much newer.

Your question about a tri-fuel carburetor - Your carb is different than mine, but I seen a YouTube video of an LK plumbed for tri-fuel and the vapor line was plumbed EXACTLY where you point out the plug on the top of your carburetor. My carb is a carter model N and does not have a plug and overall is slightly different.

You may have answered a question I had about my plunger assembly in the points box. Obviously my points are different, but I have a rubber boot that slips over the end of the plunger rod. The boot replacement no longer exists on planet earth and possibly the plunger rod designed changed too. In my thread there was an assumption that the rubber boot may actually suck oil into the points box so it may have been eliminated, at least for the LK's larger 2 cylinder CCK brother. I can clearly see that your points box plunger assembly does not have a rubber boot, but it appears oil is getting through the plunger guide and into the box (see attached picture with my notes attached below). Can you confirm?

I had one more comment/question, but I forgot while typing above. I just woke up (I think), and the coffee is still brewing, so JohnnyC is half asleep at the PC keyboard.

JohnnyC
New Jersey
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Old 02-11-2018, 09:43:03 AM
JohnnyC JohnnyC is online now
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Default Re: Onan 2.5LK-1R/12L

Quote:
Originally Posted by David C View Post
The tri-fuel LK I have has the gaseous fuel connection at that location. If it is drilled like the picture, you just need a valve and some hardware.

David C.
Nice! Does the tri-fuel LKs have a high compression head for running vapor? As you know, the genset is derated on vapor and a high compression head would make the genset more efficient on vapor.

JohnnyC
New Jersey
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Old 02-11-2018, 09:52:59 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: Onan 2.5LK-1R/12L

Yes JohnnyC, you are correct in your observations.

Quote:
Originally Posted by JohnnyC View Post
Nice! Does the tri-fuel LKs have a high compression head for running vapor? As you know, the genset is derated on vapor and a high compression head would make the genset more efficient on vapor.

JohnnyC
New Jersey
I will see if I still have my compression tester and get a reading here in a bit. We can compair to my other LK that is a gasoline only standard model.
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Old 02-11-2018, 10:07:09 AM
JohnnyC JohnnyC is online now
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Default Re: Onan 2.5LK-1R/12L

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Originally Posted by Handyhiker1 View Post
Yes JohnnyC, you are correct in your observations.

I will see if I still have my compression tester and get a reading here in a bit. We can compair to my other LK that is a gasoline only standard model.
Thanks! As for the oil in the points box, we have to look on the bright side of this issue..... We can say our LKs have a "self lubrication points" feature

JohnnyC
New Jersey
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