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Trying to ID Model of Gray Marine Engine

Old Marine Engine » Gray Marine Gas Engines - 4, 6, and 8 cylinder » Trying to ID Model of Gray Marine Engine « Previous Next »

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Jerry Keto
New member
Username: ketog

Post Number: 1
Registered: 07-2019
Posted on Wednesday, July 03, 2019 - 09:03 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The boat is a 1947 Shepherd 17' Utility with a Gray Marine 6 cyl engine. The engine I believe is correct for the year but the gearbox nameplate says the engine is a Model 109, SN G23306 which would date the engine to mid to late 1950's. I believe the gearbox is not original and misleading. The prior owner says the engine is a Phantom 6 (104?) but I can't confirm. The numbers on the head are F600A 468 0 with a HI-6 and an "S" inside a diamond. The numbers on the block are F600A 496 S with L28T. Does this info get me any closer to identifying which model Gray this is?
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Jim Staib
Senior Member
Username: drrot

Post Number: 262
Registered: 09-2008


Posted on Thursday, July 04, 2019 - 09:07 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

There should be a small round tag on the carb. What are the numbers on it?
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Jerry Keto
New member
Username: ketog

Post Number: 3
Registered: 07-2019
Posted on Thursday, July 04, 2019 - 09:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Jim,

The carb ID number is 10870A

Thanks, Jerry
Carb ID
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Jim Staib
Senior Member
Username: drrot

Post Number: 263
Registered: 09-2008


Posted on Thursday, July 04, 2019 - 09:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

10870 Came on a 100hp Gray 1949-1953
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Jerry Keto
Member
Username: ketog

Post Number: 4
Registered: 07-2019
Posted on Tuesday, August 25, 2020 - 11:45 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Jim,
Appreciate your assistance with this ID. Based on that can I assume this a Model 100 and not a Model 109 like the gearbox plate says? Also, given the boat is a 1947 model, I must assume at least the carburetor and the gearbox are not original. Is this a fair assumption?
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Jim Staib
Senior Member
Username: drrot

Post Number: 275
Registered: 09-2008


Posted on Tuesday, August 25, 2020 - 05:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Something has been changed. You have to figure out if it was the carb or reverse gear.

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