OS Drum valve .60 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 03-19-2011, 09:59 AM   #1
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OS Drum valve .60

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Last fall I picked up an old OS drum valve .60 engine. It must be from 1960 something. It originally had a butterfly exhaust restrictor, which is missing. Everything was gummed up solid with dried castor oil. I disassembled what I could and threw it in my anti freeze cooker. Three days and nothing. Heated it with the torch, nothing. I threw it back in the anti freeze for another couple of days. After heating it the sleeve and piston came out in one assembly. I got the drum valve out of the rear of the case but the carb still would not move. Put the carb and cylinder back in the cooker for another day. I could get some movement on both assemblies. I took all the screws out of the carb and worked it apart and cleaned everything. I could move the piston in the cylinder but it still would not come apart. I threw caution to the wind and fashioned a hard wood drift to fit the top of the piston, it is a baffled piston. I coaxed the piston out of the cylinder. I removed the rings and cleaned everything. For the bearings I just kept oiling them with after run oil and turning the crank. After a couple of days they turned out to be very smooth. I scuffed the cylinder and the rings with some fine wet or dry sand paper. Upon assembly there was quite a bit of a compression leak past the rings, the engine would have to be broke in again. It looks like new inside and out. I ran it the other day, it ran like a top, idled good and turned a 12X6 wood prop at 10,000 RPM. That was normal back then. I did not open up until the end of a ten minute run, then only for a few seconds. After the run half of the compression leak had gone. I find it quit satisfying when I accomplish something like this and I just had to share it.

"If my being here has made your day a little more pleasant then I have done my job" Red Skelton 1913 - 1997 (famous Comedian)
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Old 03-19-2011, 11:58 AM   #2
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Re: OS Drum valve .60

I love it. Great save. Nothing like breathing new life into a discarded old rc relic. Now all you need is a vintage kit to drop it into and you'll have a real treasure.
Dean Myers
MAAC 81138
CMPRA Calgary (www.cmpra.com)
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Old 03-19-2011, 12:14 PM   #3
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Re: OS Drum valve .60

I love reconditioning old, (and some not so long in the tooth) engines as I frequently see abuse from improper treatment, especially storage.

Would love to see a pic or two of yours as I perhaps am admitting ignorance by saying I have never heard of a drum valve motor before.

My only recommendation would be to avoid sandpaper and try scotchbrite as it is less agressive. With plated or surface hardened cylinders you can actually go beyond that and into the much less durable base metal.
I know there's money in aviation........I put it there!
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Old 03-19-2011, 02:40 PM   #4
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Re: OS Drum valve .60

I had the OS Max .80 rear rotor. It had a two plug head and it was a Stump puller.
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