+crookedcoophomestead Thanks! Glad you are getting use out of them.

Glad it was able to help out!

Thanks. It's always a hard decision to sink money into something that might not make sense. When equipment gets to the end of its usable life decisions like that have to be made. Several years ago (~2013) I swore up and down I would only ever own 300 and 400 series machines to do work. Clearly that has changed if you have watched any of my recent videos. I still love the 300 and 400 series. In fact I probably have more fun working on them now than I did several years ago. Mostly because there is no stress in working on them...... Any issues with buying a new or newer machine and then fixing the 318 up for fun as a project? Best of both worlds if you have the space. The X590 are good machines and will work hard.

Yeah it's not an easy decision. I like the 318 and its still a great machine. I don't know if the 590 is built quite as heavy duty, but it has some nice features and would most likely get the job done. The hard part is knowing when to say when. I may do some of the work like gas lines and a ring job like your doing in this video to keep it tip top. Thanx for the reply and helpful videos !!

Try calling Boomer at Boomer's Onan. Great resource! boomersonanparts.com/

Most likely. If your valves don’t seal the explosion from combustion is gonna leave out the exhaust or intake.

Thanks!

Sorry, no I’m not a shop and I don’t do any work for the public. I have a hard enough time getting my personal projects done much less needed to finish others! Sorry about that.

Ok, thanks anyway.

I’m pretty limited help with generators. With spark and fuel it should start unless either the air fuel mixture is incorrect or the spark isn’t timed right. If it’s a carbureted Onan engine take the air cleaner off and dibble some gas in the intake (not a ton) and see if it will run. If it does it’s a fuel amount issues. If it doesn’t it’s a spark issue. I think that is where I would start.

Oooooo

You could just take the oil pan off BUT when you honed the cylinders all the metal filings would remain in the engine and I am guessing your new rings would last less than 2 hrs in addition to all the other wear that would occur before the filter could filter all the filings. Back when I first started working with 318's I bought one that someone had apparently done what you are describing (based on the new piston and fresh rings) but almost every component in the engine had to be scraped.

Not really sure to be honest. Onan had many many different styles of oil pans for machines.

Did you find the oil blowing problem ? It might be caused by a plugged crank case vent

Aside from rings there are a couple things that would make an Onan like this "smoke". First thing is using too light weight of oil. Some folks swear by synthetic oil for these engines but I have found day in and day out 30wt dino oil or dino 15W-40 is what mine seems to like the best. Because of the engine design oil can get back the valves pretty easy if its a thin oil. Other issues might be oil level too full and a couple other very uncommon. If your engine is smoking I would check the compression.

You can get them from a few places. Deere has them but they are a little more expensive. Onanparts.com is a good supplier as is Boomer from Boomer's Onan. One man show and you have to call to order but a great guy to talk to about these engines.

mmrbeef what would it cost for a basic rebuild kit?

It really depends on each engine. You can deglaze the cylinders and put it all back together for less than $350. Meanwhile if the cylinders are ovaled out and require machine work, oversized pistons and the like you could spend $1,200+machine work. I tear the engines down first and then decide what it needs. This method takes a little longer but in the end it saves a heap of money.

mmrbeef ok thanks!

McMaster Carr.