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Old 06-25-2017, 07:49 PM   #1
Join Date: Jun 2017
Posts: 1
Default 7.4 454 Mercruiser Engine Problems

Hello, I am new to Maxum owners club. I just recently purchased a 1995 2300 SR with a 7.4 454 (Bored to a 468). I ran the boat once for 1.5 hrs, it ran really well! Then the boat sat in Salt Water for 2 weeks, where I moore it (didn't run the boat for 2 weeks just the blige pump). Yesterday I go to take the boat out and the engine would not turn over right away as usual. I got the boat going and warming it up then noticed the vents were letting off a lot of steam into the carb. Then I noticed a green fluid coming out of the PCV valves. Then I checked the oil and the same green sludge was in the oil (mixed with oil). The boat will not run, just idle.

Do I have a blown head gasket? This is my first boat here in Seattle. Does anyone know a good mechanic that I can take it to and have it repaired, in the Seattle area? I have owned this boat for 4 weeks now, super bummed out.

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Old 06-25-2017, 09:32 PM   #2
mmwjr's Avatar
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,768

Welcome aboard

Not a good start to boating nor the season

I am assuming you have closed cooling, heat exchanger and the green stuff is antifreeze. Could be head gasket or leaky intake. A compression or leak down test will tell you about the heads. Try removing the spark plugs to see if coolant is in the cylinders.

I'm on the other coast so I cannot recommend a mechanic.

Did you have gen engine workndown or the previous owner?, if you the mechanic should cover this.

1997 2400 SCR
5.7 Vortec / Bravo 2
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Old 06-26-2017, 09:33 PM   #3
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Join Date: Aug 2012
Location: North Bend, WA
Posts: 80

I would recommend Jim @ Yarrow Bay Marina in Kirkland.
PM me if you need Yarrow Bay's contact info.
"Firefly" - 2003 Maxum 3100 SCR Twin 5.0L/BIIIs
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