FWIW, If the timing plastic ring with magnets in it that sits behind the flywheel is not aligned with the timing sensor as it can be pushed back too far, the engine will run for about an hour and then just give up until it cools off. My first 318 had this problem that the previous owner didnít disclose to me, but I finally figured it out since it was obviously an electrical issue. I noticed that the quality of the spark was nil when the engine heated up, but was great once the ring was aligned.
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Thanks, that's good stuff to know. It seems there was a lot that wasn't disclosed to me either.
FWIW, that's a 1987 model given the SN you show, and that should be a P218 engine. 1987 was a change-over year for engines. Prior to 420xxx SN, it was the B43G so yours is an early P218 motor.
Thanks for the info.
You got a very good deal on a very clean looking tractor. As RussKish pointed out, this isn't a simple ring job, plus whatever other engine control problems you may or may not have.
I honestly don't know why you don't want to consider a repower, but that's your choice.
Another FWIW, is that an acquaintance bought his 318 new in 1985. The B43G died after 2 years. He had a shop upgrade it to a brand new P218G. Since then, it's had yet another brand new Linamar. He still uses it, but has only around 2,500 hours (total machine time) the last time he and I had a tractor talk. Obviously he takes good enough care of stuff to get 34 years out of it, but I guess my point is that Onans aren't bullet proof, and a Honda is a pretty darn good engine.
Thanks for your advice bufordT. When I posted this I was afraid that my plan may not be the best. Honestly, repower is not off the table. I'm really not sure what I am gonna do yet. I ended up working all weekend and a graduation party, so I didn't have time to work on anything. I am gonna just double check the valves one more time just to see if something happened there.
The front seal is not a big deal to replace. If you already have the PTO off then it is just a matter of pulling the old seal and putting in the new one. I use a sheet metal screw with a big head on it to remove these seals. Drill a small hole in the sheet metal part of the seal and then screw the sheet metal screw into it a small amount and then pull on the screw head. I usually use two screws, one on each side of the seal so that I can pull alternately until it comes out. I had a JD 400 with the Honda in it and it was a dream compared to an Onan or old Kohler. If you are thinking of keeping the 318 long term, I would suggest looking at the Honda real carefully before putting a lot of money into that Onan.
Thanks rudy, I thought I saw that you had done this some where before. Your the man!