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Antique Marine Engines and Outboard Motors Discussion on old marine engines, naptha, gas, oil or steam and vintage outboard motors.

Antique Marine Engines and Outboard Motors

Large single cyl Gray marine engine


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  #1  
Old 09-15-2007, 03:21:44 PM
Tom Gosciminski Tom Gosciminski is offline
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Default Large single cyl Gray marine engine

I am looking for any info on how to find a year built and the HP for a large single cyl Gray Marine engine. The flywheel measures 17 3/4" dia and has a 4 1/8" face, It also has a HUGE Schebler carb. I just picked this engine up and it may be for sale or trade so I want to have an idea of the HP and year. thanks for any help ( thanks Harry ) Tom
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Old 09-16-2007, 02:19:44 AM
Robert Haus Robert Haus is offline
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Default Re: Large single cyl Gray marine engine

Some of them have a serial # on the flywheel...the first digit is the hp and the letter that followed it was the model (at least this was true of the U type) ...I think the third or 4th digit may be the end of the yr (not certain, though)

I just recently fixed up and sold a 6 horse U type...it was a twin. (see my "catch of the day post" to find a video of it)

For the most part, the two strokes are all pre-1920, give or take...the type and location of oilers and type of water pump will also help narrow it down a bit. (the earlier ones had a rotary pump driven off the same shaft as the timer, this only pumped water in fwd, not in reverse....they later used a piston pump that worked either direction and it was driven from an eccentric at the output shaft.) Gray started making these around 1904/5 or so.

I am no expert on Grays, but post a few good photos and I'll take a crack at it....as will others around here.

rh
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Old 09-17-2007, 03:16:25 PM
Dick Briggs Dick Briggs is offline
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Default Re: Large single cyl Gray marine engine

Tom, According to what I see in an old xerox I have about Gray Marine, you have a 10 hp, model S engine - based on flywheel thickness and diameter, and the 5" stroke. There should be the mechanical oiler on the back, mounted on that flat above the shaft. The only other difference I see is the control unit for the throttle and the timer are a bit different. In my pictures, it is a horizontally set up system, while on yours it is vertical. Likely means nothing however.
Dick
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Old 09-17-2007, 06:03:46 PM
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Default Re: Large single cyl Gray marine engine

Does it look anything like this?

http://www.old-engine.com/graymotr.htm
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Old 09-17-2007, 08:31:57 PM
Tom Gosciminski Tom Gosciminski is offline
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Default Re: Large single cyl Gray marine engine

Hi Harry, it looks a lot like your engine but mine is larger. I would post photos of it but I have no idea how. Tom
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Old 09-18-2007, 07:49:20 AM
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Ernie D Ernie D is offline
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Default Re: Large single cyl Gray marine engine

Tom,
If you want I will post the pics you sent me.
Let me know
Ernie
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Old 09-19-2007, 08:18:35 AM
Richard Durgee Richard Durgee is offline
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Default Re: Large single cyl Gray marine engine

*
Harry, after several years of looking into the early history of the Gray Motor Co. it seems that Gray sold their first marine engine in 1906, it was designed and mfgrd by Stanley DuBrie an early engine designer that sold to several companies that put their own name tags on them, in Grays case he cast the Gray Motor Co. name into the flywheel.

1907 was the first year that Gray sold their own designed and mfgrd marine engine, it was a headless two cycle the cylinder and upper crackcase of a single casting, with a split case to access the crankshaft. This 1907 model
was made in two different styles, One just like your engine in the link above with the timer and rotary waterpump on the same shaft,the other was with same timer but a piston waterpump on oppopsite end of eng that Gray later named "Sandsucker" The ad below is a rare July 1907 ad for this engine.

1908 Gray came with different designed engs Like the 6 hp in the advertisemet in your link above this was a model "R" and had a separate cylinder bolted to the upper crankcase, 1908 also brought the "S" model that was the same as the "R" only it had a belt driven mechanical oiler on the aft end.

Their may be a serial number in the front outer flywheel rim of your 1907 engine ? If you find it let me know i'll record it with my list of Gray motors !

July 1907 AD
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Old 09-19-2007, 08:59:46 AM
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Default Re: Large single cyl Gray marine engine

There was a number on the block below the exhaust port if I remember correctly, something like 104. I'll take another look today and maybe a photo.

I'm glad to see that you have done research to record the history of these engines. I haven't found too much available over the years.

While I'm here, I'll give Tom a free plug. Here's the link to his engine. And I thought mine was heavy!

http://www.enginads.com/classifieds/...uct/5175/cat/8
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Old 09-19-2007, 09:53:49 AM
Tom Gosciminski Tom Gosciminski is offline
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Default Re: Large single cyl Gray marine engine

Harry, thanks for posting the link to my engine, I sure would like to know more about it, the serial number is # S 12082 Tom
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Old 09-19-2007, 12:13:06 PM
Richard Durgee Richard Durgee is offline
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Default Re: Large single cyl Gray marine engine

*
The serial number denotes a 1912 Model "S" the model that originally
came with a belt driven mechanical oiler mounted on the output flange,the model R used drip oiler !
many of these mechanical and drip oilers were removed with the finding that mixing the gasoline and oil in two cycle engs was a much superior method of lubrication.
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Old 09-19-2007, 01:18:29 PM
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Default Re: Large single cyl Gray marine engine

Here's the number 107 that sits below the exhaust port. Digging further and rechecking the flywheel rim, I found the number 5286.
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Old 09-19-2007, 03:31:02 PM
Tom Gosciminski Tom Gosciminski is offline
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Default Re: Large single cyl Gray marine engine

Hi Richard, how can I tell the hp of this engine ? it has 17 3/4" flywheel with a 4 1/8" wide face, and about 5" stroke. Thanks for all the info. Tom
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Old 09-19-2007, 08:15:04 PM
Richard Durgee Richard Durgee is offline
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Default Re: Large single cyl Gray marine engine

*

Harry thanks for the serial number !

The few serial numbers that i have seen on the 1906 Gray engs made by DuBrie were 4 digit all ending in 6 which I believe indicate 1906 ?

Your 1907 eng is the only one that I have been able to get a serial number from and its 107 I believe may indicate 1907 don't yet know what the flywheel numbers indicate ?

1908 thru 1920's Gray two cycle engs had a serial numbering system that with a look at or photo and the full serial number i can now tell the model and year of mfgr !

Tom my earliest spec sheet at hand on Gray engs is 1913 and they were different than your 1912- by 1913 the Hp ratings changed and the flywheel end of the crankshafts were tapered and threaded unlike earlier ones with straight shaft and gib keys. maybe someone has a 1912 or older Gray catalog with specs ??

This is photo of my 1911 10 Hp model "S" Gray taken about 10 yrs ago at an auction when I bought it. The flat cast pad on the output flange was for mounting the mechanical oiler that had been removed.
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Old 09-20-2007, 05:34:27 PM
Robert Haus Robert Haus is offline
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Default Re: Large single cyl Gray marine engine

Richard,

Can you tell me the year of a twin cylinder U type Gray? ...the serial number is: 6U300554 ...this is a flywheel number and I believe the first two digits denote this as a 6 horsepower U type. ...I am not certain, but I think the 4th digit may the the year, either 1910 or 1920????

thanks,
Robert

http://www.youtube.com/watch?v=EiNg_cSDYt0
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Old 09-20-2007, 08:20:01 PM
Richard Durgee Richard Durgee is offline
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Default Re: Large single cyl Gray marine engine

*

Fourth digit back from the right is "0 " Model U wasn't
mfgrd in 1910 so yours should be a 1920 -- with round threaded
inspection covers and waterpump bolted to rear cylinder !

1921 Model U Gray Motor
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