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Unknown Overhead Valve SIngle

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Mark S
Senior Member
Username: marks

Post Number: 107
Registered: 03-2002
Posted on Saturday, September 05, 2009 - 07:03 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hello All,

Any information on this engine would be much appreciated. Somebody said Gray but weren't sure.

The engine is in Australia, fastener threads are fine.

Cheers,

Mark S

Pic1

Pic2

Pic2
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Eric Schulz
Senior Member
Username: eric_schulz

Post Number: 57
Registered: 01-2007


Posted on Saturday, September 05, 2009 - 09:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Look here:
http://www.oldmarineengine.com/discus/messages/3454/100977.html

Eric
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Mark S
Senior Member
Username: marks

Post Number: 108
Registered: 03-2002
Posted on Sunday, September 06, 2009 - 01:10 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks Eric,

As always quick and helpful. I hadn't seen that post before.

Regards

Mark
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Ernie
Senior Member
Username: ernie

Post Number: 1030
Registered: 01-2002


Posted on Sunday, September 06, 2009 - 05:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Search for US Motors, US Motors Falcon, Gray, Bridgeport and Ace OK. Maybe even more. Lots of pics and info on OME of this style of engine. Note some of the pics aren't backwards. These engines were made by different mfrs as mirror image. Maybe a good way to steal a design and get around patent laws???
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Richard A. Day Jr.
Senior Member
Username: richardday

Post Number: 798
Registered: 11-2003


Posted on Monday, September 07, 2009 - 08:42 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Why do I think this engine was converted to a stationary hence the absence of the water pump and the Shade Tree Mechanic appearance of the magneto mounting.
The flyball governor end of the camshaft would have driven a Cuno timer in the marine version.
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Mark S
Senior Member
Username: marks

Post Number: 109
Registered: 03-2002
Posted on Monday, September 07, 2009 - 06:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks Ernie and Richard,

I figured that there should be a timer where the governor is. Interestingly there is a casting fault with the cylinder. The waterjacket core was either not placed correctly or moved during casting.

So the outside of the waterjacket on the rear of the cylinder is very, very thin and porous. I wonder if this is why it ended up as a stationary engine as it would only have lasted a short time in a salt water environment.

Mark S.
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Richard A. Day Jr.
Senior Member
Username: richardday

Post Number: 799
Registered: 11-2003


Posted on Monday, September 07, 2009 - 07:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

One point I forgot to mention there appears to be a plate blanking off the crankcase breather valve. I wonder how it would breath. The oil dip stick it seems to me would probably vent a lot of oil. As well as the valve push rod guides. Is their a breather valve in the oil filler pipe?
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Mark S
Senior Member
Username: marks

Post Number: 110
Registered: 03-2002
Posted on Tuesday, September 08, 2009 - 07:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Yes Richard there is a breather in the oil filler pipe, The cap has @ 1/8" hole.

Now to find a Cuno timer to replace the governor.

Cheers,

Mark S.
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Richard A. Day Jr.
Senior Member
Username: richardday

Post Number: 802
Registered: 11-2003


Posted on Tuesday, September 08, 2009 - 07:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

But is there a check valve in the oil fill pipe?? When the piston goes down it compresses the air in the crankcase forcing air out the "breather" through the check valve. When the piston goes up it creates a vaccuum in the crankcase as the check valve closes. The vacuum thus created tends to keep the oil in the crankcase instead of spewing out every possible location filler cap, valve push rods, cam shaft, crankshaft etc. In some engines this process builds up and dies away in others once the vacuum is established there is little activity resulting in little or no oil leakage.
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Mark S
Senior Member
Username: marks

Post Number: 111
Registered: 03-2002
Posted on Tuesday, September 08, 2009 - 11:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Rihard there is a check valve, under the cap. Very simple it's a circular piece of leather, held at a single point.

BTW the engine runs very well, have put a Schebler on it and an impulse mag. Idles very well and nearly always starts first swing of the flywheel.

Mark

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