Anyone know of any kind of forum where they talk about marine engines? I have a friend who has a boat with a Volvo 4 cyl, gas, pushrod engine that died and won't start. He has all the overhaul manuals but I'm wondering if there's anything that can be checked without really tearing into it?

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k