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318 Onan P218 - Rebuild or Repower?


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109 replies to this topic

#61 olcowhand ONLINE  

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Posted November 13, 2011 - 03:41 PM

It won't be long now! Everything is looking good! You'll probably be fine on the rod torque. On most aluminum rods I hardly ever use a torque wrench.....just go by feel. It's not failed me yet, but then I've had tons of engine rebuilds go past my hands. You get a feel after a while.

#62 JDBrian OFFLINE  

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Posted November 13, 2011 - 05:36 PM

Thats really starting to come together. Thanks for posting your progress.

#63 Lawnguy OFFLINE  

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Posted November 14, 2011 - 06:26 PM

thanks guys! Its been a few months, but do feel like I'm getting close now. tonight the oil pan went on. Onan 102-1387. After rotating the gasket and the pan, there realy is only one way it will go on, but refered back to the before pictures just be sure. Oil drain toward the filter which makes sense. Appoligize for the oil pan not totaly being clean, but am working with a spray can of brake cleaner here....lol I plan on pressure washing everything once I get it buttoned up anyways. I posted one of my before pictures just to show you how bad this motor was when I started!

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#64 olcowhand ONLINE  

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Posted November 14, 2011 - 06:32 PM

Man was that engine skanky when you started! Looking real nice now though!

#65 Lawnguy OFFLINE  

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Posted November 14, 2011 - 06:34 PM

Just thought I'd mention this even though alot of JD people probably know this already (I didn't). The autoparts guy crossed the oil filter over to Fram PH4967. Hey, it was on sale!

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#66 Lawnguy OFFLINE  

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Posted November 15, 2011 - 06:00 PM

Putting the intake and carb back on tonight. New gaskets, New bolts & washers because I misplaced the ones I took off. Gapped the plugs at .025 and installed the oil fill tube.
Cleaned and re-installed the big oval cover as well. Going to try and bench build as much as I can before setting it back in the engine bay!

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#67 Lawnguy OFFLINE  

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Posted November 15, 2011 - 06:05 PM

My first casualty. I think its a manifold breather? I ripped it while cleaning it. Looking at the parts book it looks like its 123-0952 tube, breather?

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#68 Lawnguy OFFLINE  

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Posted November 15, 2011 - 06:08 PM

Quick pic of the engine bay. Had a chance to clean it up the other night. I may throw some paint on it before setting the motor back in.

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#69 olcowhand ONLINE  

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Posted November 15, 2011 - 06:08 PM

I get part #123-1429

New Onan Breather Tubes
  • Alc said thank you

#70 Lawnguy OFFLINE  

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Posted November 15, 2011 - 06:13 PM

I get part #123-1429

New Onan Breather Tubes


Yep thats it! okay $12.00 plus shipping.... not bad... you never know about Onan parts...lol
  • Cvans said thank you

#71 JD DANNELS OFFLINE  

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Posted November 16, 2011 - 12:15 PM

I think you made a good decision in rebuilding. My brother put a 23 hp Briggs Vanguard in his 420 this summer. While he likes it and says it is much smoother than the Onan. He says He thinks it has less torque than the old Onan.
Besides I like the sound of the Onan better. My neighbor has a newer machine than my 318, with a Kawasaki and it does not sound like an Onan at all.

#72 olcowhand ONLINE  

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Posted November 16, 2011 - 12:23 PM

Other than a diesel, nothing sounds sweeter than a proper running Onan!!

#73 Cvans ONLINE  

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Posted November 16, 2011 - 03:14 PM

Other than a diesel,

You just had to throw that in there didn't you.:smile1:
I've enjoyed this string. Looking forward to your running report.

#74 Lawnguy OFFLINE  

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Posted November 16, 2011 - 07:08 PM

When you have pistons the size of a 350 chevy, how could it not sound good? Wonder what a chrome vertical mounted motorcycle muffler would sound like? lol

#75 Lawnguy OFFLINE  

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Posted November 17, 2011 - 07:31 PM

Didn't get very far tonight, so glad everyone is bearing with me here. I was able to get the starter bolted up, installed the carb to govenor linkage, and wired the coil back up. I finaly did clear up some room on my bench because I went ahead and set the motor back in the tractor! So far so good, except I'm searching thru my bolt tray for the four bolts that mount the pto shaft.

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