Onan 2.5LK Parts Sources

[Imlost]

I have a 2.5LK-1R/6000J that is going to need rebuilding soon. I have some part #'s from the manual but it seems they are all "obsolete" and have been superseded.
For a .005"o.s. piston the old p/n I have is 112-71-05 which appears to have been superseded by 112-0136-05, then 112-0179-05.
Can anyone tell me what current p/n's I need to obtain a .005"o.s. piston, rings 113A87-05/113-0087-05, gasket set 168-0065, generator end bearing 510A47/510-0047 (if they're even still available)?
Thanks.

[Max Thompson]

Onan uses a standard 7 number format for part numbers now, ###-####. Old part numbers used 3 numbers ahead of the - and sometimes a letter and 3 numbers after the dash and sometimes just 3 numbers. Letters have been replaced with zeros, or zeros added ahead of the last number set so all the numbers fit the new format.

Yes, most parts for the LK are obsolete. I have the piston in .10 over not .05 but no rings. The bearing can likely be matched up by a bearing manufacture (auto parts supply should be able to do it for you). I do have the 510-0047 bearing.

Bottom line, it would be very easy to spend more on repairs than an LK is worth. They are great little sets, I have one on one of my service trucks. But, I would not expect to pay over $150 for a "good" LK, if I remember right I gave about $50 for the one I have.

[Esteban32696]

I looked up a couple of those part numbers you listed, & found the parts with new numbers , here. I think they may have all you need.

https://onanparts.com/

[Kevin K]

Originally Posted by Max Thompson

Bottom line, it would be very easy to spend more on repairs than an LK is worth. They are great little sets, I have one on one of my service trucks. But, I would not expect to pay over $150 for a "good" LK, if I remember right I gave about $50 for the one I have.

Please consider following Max's advice here. The cost of the parts alone would be more than the LK is worth. Not to mention any machine shop fees for work you can't do yourself.

My first LK cost me $150 after I saw it run and produce power. My second LK was $75. Both are in great shape after a little TLC. Keep an eye on Craigslist for a low hour LK.

[JohnnyC]

I am currently working on an LK. Many parts that I am ordering also fit CCK models.

JohnnyC
New Jersey

[Gary Potts]

I have .005 piston and rings and the end bearing

[gnucklehead]

Generator end bearing - Onan used a modified Nachi 6205NSE in the generator end of many different models. A good quality 6205 for electrical service can be notched for that little "anti-spin" clip.. Do not try to remove the clip alone, it will break

https://www.smokstak.com/forum/showthread.php?t=128602

[Motorhead]

I believe that the LK shared a lot of parts with the CCK line.

[Imlost]

I've looked for a "replacement", but haven't been able to find one within 400mi of me. There are a number of reasons I want to rebuild vs. purchasing another one.
If I buy a "used" LK I won't know how long it'll last before needing rebuilding (which is exactly what happened with this unit).
If I rebuild I'll know that as long as I maintain it it'll last a long time.
This unit isn't used for backup or emergency power. It's used as a primary power source for a pressure washing rig, for anywhere from 20 to 40hrs a week.
My boss doesn't mind spending the money necessary to rebuild it.
I just really enjoy restoring and tinkering with "old" engines/mechanical stuff.

So I've just got to round up the necessary parts/gaskets for a complete rebuild. If I can find a temporary running replacement LK to fill in while the rebuild is in progress, that would be ideal. But so far I haven't had any luck in finding one.

[Esteban32696]

It is probably worth it to you to rebuild, then. YES, it will cost a good bit, but will save in years to come. I cannot tell that my 1968 , 2.5 LK has ever been apart !