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Gray Marine 4-75 overheating

Old Marine Engine » Gray Marine Gas Engines - 4, 6, and 8 cylinder » Gray Marine 4-75 overheating « Previous Next »

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Tom Blythe
New member
Username: flx38century

Post Number: 1
Registered: 07-2019
Posted on Tuesday, August 27, 2019 - 02:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Recently purchased a 38 Century with a Gray marine 4-75 that overheats quickly. Also noted water in the oil when I changed it. What should I consider? Head gasket? Leaking from oil cooler?
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Jim Staib
Senior Member
Username: drrot

Post Number: 264
Registered: 09-2008


Posted on Tuesday, August 27, 2019 - 04:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

First check the water flow out the exhaust pipe. See how much flow and how hot it is. When you fire it up how long does it take to get water out the pipe?
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Tom Blythe
New member
Username: flx38century

Post Number: 2
Registered: 07-2019
Posted on Wednesday, August 28, 2019 - 08:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thx Jim, after 1/2 turn on the grease cup to prime the pump, some water does come out within 30 seconds. I havenít owned it long enough to know how much should be coming out. The previous owner had a reinforced clear line on the water line before going into the exhaust to be sure water did flow. On my second trip out that line melted within 10 minutes.
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Jim Staib
Senior Member
Username: drrot

Post Number: 265
Registered: 09-2008


Posted on Thursday, August 29, 2019 - 07:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Sounds like there was a water flow issue and the last owner knew it. Time to fix it right.

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