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Identify engine AMC?

Old Marine Engine » Gray Marine Gas Engines - 4, 6, and 8 cylinder » Identify engine AMC? « Previous Next »

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Gerald Lee
New member
Username: paycojoe

Post Number: 1
Registered: 05-2011
Posted on Saturday, May 14, 2011 - 12:20 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have a pair of Graymarine engines in my 32" Trojan
1962 fireball V8 178hp flywheel forward # S6688-1
are these engines AMC? where can i get parts timing gear sets etc....
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Jim Staib
Senior Member
Username: drrot

Post Number: 84
Registered: 09-2008


Posted on Saturday, May 14, 2011 - 07:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Most likely they are Rambler/AMC 287CID. Internal parts are often the same as automotive. Search in HEMMINGS the old car book.
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Gerald Lee
New member
Username: paycojoe

Post Number: 2
Registered: 05-2011
Posted on Saturday, May 14, 2011 - 01:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks Jim I thought so but i kept seeing "fireball" as a GM engine in Wikipedia anyway thank you for the help

Payco
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Brad Hunter
Member
Username: silverghost

Post Number: 18
Registered: 05-2009
Posted on Saturday, May 14, 2011 - 06:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The Graymarine Fireball V-8C 178 was only a 250 Cubic inch American Motors Corp. based engine.
Fireballs were also built in 287,& 327 cubic inch models.
But the 178 HP models were only 250 cubic inches.
This I know for sure as fact.

It was a very good engine.
They were built & sold from 1957- 1968 only.
Later Graymarine engines were not based on the AMC base auto engine.
Dad & I owned one for over 30 years.
I have many old NEW & older Graymarine Fireball parts just sitting on our old spares shelf in our basement.
Call me with you needs.
I can supply much information also.

NAPA Auto stores sell the timing chains & gear sets.
They are known for streaching and throwing off your engine timing & performance.
The large cam gear with nylon plastic teeth is a weak link also.

Brad Hunter
(Near Philadelphia)
1 215 947 4676
silverghost1926@msn.com
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Jim Staib
Senior Member
Username: drrot

Post Number: 85
Registered: 09-2008


Posted on Monday, May 16, 2011 - 11:42 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Gray manual
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Brad Hunter
Member
Username: silverghost

Post Number: 20
Registered: 05-2009
Posted on Monday, May 16, 2011 - 12:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

There should be a brass engine ID tag that will give you the engine data.
Graymarine used some odd carburator combiations such single & dual Carter 1 barrel YH side-drafts, carter 2 barrels, and carter AFB/AVS 4 barrels.

What does the ID tag say on your Fireball & what is it's carb set-up ?
This will help pin-down what you really have there.
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Gerald Lee
New member
Username: paycojoe

Post Number: 3
Registered: 05-2011
Posted on Tuesday, May 17, 2011 - 01:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thank you Brad
The engines have "YH" side draft carbs the tag on the intake manifold has the # S6688-1 it is a 31" 1962 Trojan im still not really sure what model it is.
I was getting ready to pull the star, engine to change the main seals and pan gaskets to stop an oil leak, ten the timing change jumped a tooth ih the port engine, so i need to nail this all down and find the right parts
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Brad Hunter
Member
Username: silverghost

Post Number: 21
Registered: 05-2009
Posted on Thursday, May 19, 2011 - 12:11 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Your engine is a 1956-1968 AMC V-8 engine.
Timing Morse Chain & gearsets can be bought at NAPA auto parts and also Chrysler/Jeep Dealers.
The original camshaft gears were aluminum or pot-metal with nylon plastic teeth .
They often break & the chains get very loose .

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