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Onan W2C Fairbanks Morse Repair


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  #1  
Old 11-03-2017, 05:03:13 PM
AngrySailor AngrySailor is offline
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Default Onan W2C Fairbanks Morse Repair

So I'm finally home from 4 months on the Great Lakes and I'm rearing into my Great Grandfather's Onan. He stopped running it after it was frozen by an early frost. Back in the 80's my father and grandfather used Devcon on the cracked cylinder head but never got it running. I got it running last year, here's the first start up video: https://youtu.be/OzD8eBWDT-A

It ran a couple hours before the cylinder head started leaking externally, then she started burping coolant on start up signaling an internal leak I hadn't held out much hope for the repair lasting so I wasn't surprised.

I've just pulled the head hoping it was a gasket problem but it seems ok. There is also severe rust damage in the forward cylinder. I'm thinking the cylinder is cracked but can't see anything obvious. I wonder if there is enough meat to sleeve it?

Anyways, here's some pics!
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  #2  
Old 11-03-2017, 05:06:49 PM
AngrySailor AngrySailor is offline
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Default Re: Onan W2C Fairbanks Morse repair.

More pics of carnage. Also a shout out to Dan H, sitting on my kitchen table when I got home was a nicely packaged new head gasket

The pic of the head with the screw driver pointing at it is where the crack is under the epoxy repair.
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Old 11-03-2017, 07:12:43 PM
Kevin K Kevin K is offline
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Default Re: Onan W2C Fairbanks Morse repair.

My Fairbanks Morse W3S is similar to yours. This winter I need to take it apart and fix a sticking valve.

https://www.smokstak.com/forum/showthread.php?t=136885
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Old 11-03-2017, 07:38:05 PM
AngrySailor AngrySailor is offline
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Default Re: Onan W2C Fairbanks Morse repair.

Nice! These machines have a lot of character, and built heavy! I'm going to clean up the head and have a good look at the gasket, I'm hoping the head is cracked into the combustion chamber and not the cylinder. I think I will sleeve it and hopefully reuse the piston.

I MIGHT have valves and guides NOS somewhere but haven't seen them in years so they're buried at my dads shop.
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Old 11-09-2017, 01:39:30 PM
AngrySailor AngrySailor is offline
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Default Re: Onan W2C Fairbanks Morse Repair

Vacation cut short only have a few days left so I'm thrashing in the shop to organize this week. Bought an air compressor at a price I couldn't refuse, building a stand to set it on and use the floor space underneath as a new home for my W2C and Wisconsin/Hobart welder

Going to call LA sleeve and order up a universal sleeve. They're long enough I can sleeve both bored with one sleeve can't wait to pull her apart and see if the piston is salvageable, she ran great and even had decent compression considering how rust pitted the front bore is!
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Old 11-09-2017, 07:38:08 PM
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Default Re: Onan W2C Fairbanks Morse Repair

Ok, now I'm tired... time for a shop beverage
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Old 11-09-2017, 07:44:06 PM
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Default Re: Onan W2C Fairbanks Morse Repair

You certainly have the air compressor from hell!
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Old 11-09-2017, 07:50:34 PM
AngrySailor AngrySailor is offline
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Default Re: Onan W2C Fairbanks Morse Repair

Almost too big I might set up a small head (maybe 1hp) and stepped pressure switches... couldn't pass it up for what I paid for it though.
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Old 11-09-2017, 08:04:31 PM
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Default Re: Onan W2C Fairbanks Morse Repair

Nice tunes btw. That has to be ~1 kW.
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  #10  
Old 11-09-2017, 08:15:17 PM
AngrySailor AngrySailor is offline
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Default Re: Onan W2C Fairbanks Morse Repair

Oh yeah, gotta have shop tunes. She bi-amp 2400w low frequency and 300wpc stereo high frequency. Got some old phase linear stuff in the house
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