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jpmopar

Help ID a McCormick Deering Power Unit

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Hey Guys,

I have a McCormick Deering power unit that belonged to my late father and grandfather. They purchased it in the mid-50's and it powered their sawmill for ten years or so. It was disassembled in the late 60's to fix a valve problem. Parts were hard to obtain at the time so the unit was never ran again. A replacement valve was machined for it back in the early 80's, but was never installed. It's been under cover for the past 35 years and the head and oil pan are in a shed. My question is : What exact model is this unit? I'm thinking a P-300, but I can't find a model tag anywhere on it. The block is dated 12. 27. 35. Also, any ideas of the value of this machine? It's all there and in pretty good shape, although the bottom of the fuel tank is rusting out. It belongs to my brother and me now. We both agree that we will probably never restore it, so we would like to sell it.

Any info you can provide on it would be a big help.

Here are some photos.

Thanks,

Jim

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Engine looks the same as my 1938 W-14 McCormick Deering tractor.

Cooter

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Looke more like a 10-20 or W-30 engine with the oli filter at mid-length and the throttle shaft running to the front of the engine. Certainly not a 12 or 14 engine and the filter is at the back end of the side of the block and the governor unit and the spark plugs are on the other side of the engine.

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Looke more like a 10-20 or W-30 engine with the oli filter at mid-length and the throttle shaft running to the front of the engine. Certainly not a 12 or 14 engine and the filter is at the back end of the side of the block and the governor unit and the spark plugs are on the other side of the engine.

The W-12 engine was sold as the P-12 power-unit

The 10-20 engine was sold as the No.200 power-unit

The W-30 engine was sold as the P-30 power-unit

The 15-30 (22-36) engine was sold as the No.300 power-unit

Google those power-unit models numbers, there are photos of them on Wisconsin Historical Images website. :)

Size wise it looks like a 10-20 engine

My guess only.

M.H.

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Looke more like a 10-20 or W-30 engine with the oli filter at mid-length and the throttle shaft running to the front of the engine. Certainly not a 12 or 14 engine and the filter is at the back end of the side of the block and the governor unit and the spark plugs are on the other side of the engine.

The W-12 engine was sold as the P-12 power-unit

The 10-20 engine was sold as the No.200 power-unit

The W-30 engine was sold as the P-30 power-unit

The 15-30 (22-36) engine was sold as the No.300 power-unit

Google those power-unit models numbers, there are photos of them on Wisconsin Historical Images website. :)

Size wise it looks like a 10-20 engine

My guess only.

M.H.

Thanks for the info guys. Looking at photos of the power units mentioned above, mine appears to be the 15-30 ,No. 300. The 10-20 (No.200) seems a bit smaller than mine according to some measurements I ran across online. Any ideas on the value of the unit? I'm not looking for an exact appraisal, just a rough estimate. Including the stand, this thing probably weighs a ton. I've had a couple of antique farm machinery guys telling me I could get more out of it in scrap than if I sold it right out! (Don't worry, I'm not going to scrap it).

Thanks

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There are people who collect power units of various brands.

They are more the "old engine" crowd rather the "old tractor" crowd it seems. :)

Best of luck, try various old engine clubs etc,

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There are people who collect power units of various brands.

They are more the "old engine" crowd rather the "old tractor" crowd it seems. :)

Best of luck, try various old engine clubs etc,

P.S. My notes on No.300 (a.k.a. P-300) power unit is that there were two versions.

The early one was built from 1929-32

The later was built 1935-41

The later one, probably yours, is the same as the 22-36 ("New 15-30") tractor engine with a 4.75" bore x 6" stroke.

Some engine parts are still commercially available.

Send me a PM if you need a list of possible parts suppliers.

Regards from Michael Halsall B)

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NEW HOME... Jim and I got together and now his power unit resides in Ohio. Amazingly, it's in good shape for being under a tree and a tarp for over thirty years. Sleeves and pistons look usable and are unstuck, so hopefully I'll get by with only needing gaskets and rings. It looks like I'm also gonna need seven new valves and an exhaust seat. Hopefully I won't have to more than double my original investment. Got it cleaned up the other day and put some wheels under it (makes it easier to handle in the shop). I don't have any plans for it, it's my first power unit, but I have a 22-36 tractor (same engine). So now I have a set I guess.

P.S. Anyone know where I can find a gas and water tank for it?

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I am going to guess a model 200 , looks like a 10-20 engine ( Please do not till me it's close to Ohio)

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Look`in at that old Unit makes me think ,What was there , What was Her last Job , Why did they leave me Behind ........ ? .

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Found a water tank, still looking for a fuel tank?

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Hey Guys,

I have a McCormick Deering power unit that belonged to my late father and grandfather. They purchased it in the mid-50's and it powered their sawmill for ten years or so. It was disassembled in the late 60's to fix a valve problem. Parts were hard to obtain at the time so the unit was never ran again. A replacement valve was machined for it back in the early 80's, but was never installed. It's been under cover for the past 35 years and the head and oil pan are in a shed. My question is : What exact model is this unit? I'm thinking a P-300, but I can't find a model tag anywhere on it. The block is dated 12. 27. 35. Also, any ideas of the value of this machine? It's all there and in pretty good shape, although the bottom of the fuel tank is rusting out. It belongs to my brother and me now. We both agree that we will probably never restore it, so we would like to sell it.

Any info you can provide on it would be a big help.

Here are some photos.

Thanks,

Jim

Guys,

I'm a bit late as you've already figured this one out, but it's the 22-36 equivalent. It has a water-pump and V-belt, but also two tanks and no engine blanking plate between the magneto arm and bulkhead, denoting that it is a P-300

I had the chance of buying one very cheaply before (happened to be another '35) but couldn't arrange transport or shipping from where it stood to any of my friend's contacts over your side of the pond, being how far the distance was.

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That would happen to be a P-200; very dilapidated at that!

Looking at the air-cleaner, aspects of a Vortox/Pomona 318, in-conjunction with the combination manifold, persuades that it is 1929.

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I still have the P -300 power unit in the corner of the shop , found both fuel and water tanks , had the head and mag redone . Just got involved with other projects ( airplane ) hope to get back to it this winter and get it running ! Surprised to see this topic back up, lucky I caught it.

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