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  1. #1

    Default Please help me!!

    Overheating at idle. 1988 Mercruiser 5.7l magnum, I know I'm the trillonth person to ask this.... Replaced manifolds, risers, impeller, water pump, thermostat, hoses to risers, cap, rotor, plugs, wires, coil flushed multiple times no blockage good water flow from exhaust ports... Don't know what else to check or look at please help before I blow it up....

  2. #2
    Join Date
    Dec 2006
    Greenfield Me. USA

    Default Re: Please help me!!

    Ayuh,...... Does the t-stat housing have check-balls in 2 of the ports,..??

    Are the check-balls barely touchin' the housin', 'n free to move about,..??

    Merc has used a warm manifolds coolin' system, 'n a cold manifolds system,.....

    Mixin', 'n matchin' the two can cause these kinda problems,.....
    Any Grease is Better,... Than No grease at All....

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