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Original Liturature for sale

Old Marine Engine » Gray Marine Gas Engines - 4, 6, and 8 cylinder » Original Liturature for sale « Previous Next »

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Jordan Heath
Member
Username: fireballing

Post Number: 5
Registered: 09-2013
Posted on Thursday, September 01, 2016 - 08:10 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have been collecting original literature for the last 10 years or so and have amassed some duplicates. Contact me with specific needs, I may have what you are looking for.
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peter siegel
Member
Username: vtpete

Post Number: 9
Registered: 07-2016
Posted on Monday, September 12, 2016 - 12:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I am looking for an engine man. for a 1964 or close 70rd gray.
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Montgomery Gisborne
New member
Username: junk_lover

Post Number: 3
Registered: 11-2016
Posted on Thursday, November 17, 2016 - 10:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi,

I am looking for any literature pertaining to my 1929 Gray Marine Motor Company model 6-40 with a 200 CID motor.

Thanks!

Monte
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Robert
Senior Member
Username: robert

Post Number: 806
Registered: 07-2003
Posted on Sunday, November 20, 2016 - 02:38 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Try www.internalfire.com They have a large manual library you can access for a nominal fee.

You saw this? http://www.earlytimeschapter.org/etc-marine-engines.pdf

"ETC-Era Pontiac Marine Engines
Arn Landvoigt brought this subject to me several years ago after having come across a Pontiac split-head 6 cylinder converted by Gray Marine for use in a 1931 Chris Craft. Gray Marine built engines for years, but began converting automobile engines in 1927. So far, Arn has identified 4 split-head six conversions from Gray; the 6-27 from 1927, the 6-40 from 1927-28, the 6-41 from 1928 and the 6-63 dating from 1931-32."

https://en.wikipedia.org/wiki/Pontiac_straight-6_engine#239

"Split Head" Six
186

"In the 1920s Oakland Motor Car engineers designed an all new engine for their "companion" make, the Pontiac that was introduced in 1926. It was a side-valve design with a one piece cast iron block with three main bearings. An unusual feature was that it had two separate cylinder heads that each covered three cylinders. The ignition distributor was mounted on top of the block in the gap between the heads.

This engine displaced 186.7 cu in (3.1 L) (3.25x3.75) and was rated at 40 hp (30 kW; 41 PS) @ 2400 rpm when it was introduced. The compression ratio was 4.8-1.[1]
200

In 1929, the "split head" Pontiac six was increased in displacement to 200 cu in (3.3 L). The horsepower rating increased to 60 hp (45 kW; 61 PS) @ 3000 rpm. Compression was increased slightly to 4.9-1.[1] The "split-head" six was discontinued by Pontiac at the end of the 1932 model year. Pontiac offered only eight-cylinder engines during 1933 and 1934."

Three main bearings doesn't sound so great in a marine engine where the loading is heavy and continuous. Probably Gray Marine got a good deal from Pontiac on engines they were dropping from production cars.
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Montgomery Gisborne
Member
Username: junk_lover

Post Number: 4
Registered: 11-2016
Posted on Sunday, November 20, 2016 - 09:38 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Robert,

Thanks for your valued input. The "Internal Fire" petered out, but the other lead was dynamite. Almost every clue leads to the Pontiac connection, including the three-bearing deal.

The Gray Marine Motor has been completely disassembled and is going into the hot tank on Monday. A few other interesting points about this motor is that the camshaft run without bearings and the main journals are babbitted removable shells. The connecting rods are babbitted. There are no valve seat inserts so I am considering machining the block and having hardened inserts added.

By every account, this is a motor with almost no prior use. All internals looked very good and the cylinder bores will need a light hone at most, no ridges or anything. I can see no evidence of overbore, I will measure after hot tanking to determine for certain. Everything spun freely prior to dismantling.

The shaft that runs vertically through the block was used for the distributor in the automotive application, but my Gray has a distributor which runs off the (multiplex chain-driven) generator. The vertical shaft associated with the auto generator, which runs off the camshaft and emerges directly between the two cylinder heads, has been repurposed as a device which I find to be a bit of a mystery... possibly some kind of a cooling-related system. Perhaps people more familiar with these motors can help me figure that out.

Thanks for everything,

Monte
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Jordan Heath
Member
Username: fireballing

Post Number: 7
Registered: 09-2013
Posted on Monday, November 21, 2016 - 03:30 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Monte,

I have the original full line catalog for 1929 that shows your engine and specs etc. It is not for sale but I can copy pertinent info for a nominal fee.

The shaft coming out of the head is for a tach drive. If you have the drive head then you are ahead of the game :-) There was also a dual ignition offered that ran a second distributor in this location.

Feel free to e-mail me directly.

Jordan
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Montgomery Gisborne
Member
Username: junk_lover

Post Number: 5
Registered: 11-2016
Posted on Monday, November 21, 2016 - 11:08 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Jordan,

Thanks for the feedback. I would love to purchase the copy as offered, but I cannot find your email.

I have seen other marine engines with dual ignition, such as Scripps, but the dual ignition was usually handled by simply making a distributor cap with twice as many outputs and wires. I find the idea of a second distributor as very odd. I think I will take you up on your second suggestion and use the vertical shaft to run a tachometer, which would be rather handy.

Please advise re above,

With thanks,

Monte Gisborne
emotive@hotmail.ca

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