MerCruiser 4.3L V6 Engine Will Not Crank Over

Question

My MerCruiser MCM 4.3L GM V6 will not crank over in order to start the engine. So basically the crankshaft does not turn the internal combustion engine at all.

Before I pay a mechanic to diagnose the starting problem, what should I check when a MerCruiser 4.3 liter engine won’t turn over and begin to run?

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Benjamin Yue 4 months 2021-02-09T20:14:18+00:00 0 Answer 46 views 0

Answer ( 1 )

  1. Engine Will Not Crank Over

    These are the basic things you should check if your inboard motor will not crank over and begin operating.

    • Be certain the control shifter lever is not in the neutral position.
    • Be certain the battery charge is not low or damaged. Test it.
    • Be certain the battery terminal cables are not damaged.
    • Be certain the battery terminal cables and all electrical wiring connections are tight and free of corrosion.
    • Check if the starter motor fuse is blown (this only applies to older models with a red wire going to a fuse on the starter terminal).
    • Check for a tripped circuit breaker.
    • Determine if the ignition switch is faulty.
    • Check the slave solenoid.
    • Determine if the neutral starter safety switch is faulty.
    • Bad starter solenoid.
    • Bad starter motor.

    Most auto part stores will test the battery for free or you can do it yourself. Bench test the starter if need be.

    Applicable Models

    The information on this page is applicable to several models and years, including 1983 1984 1985 1985 1987 1988 1989 1990 1991 1992 1993.

    MODEL SERIAL NUMBER
    MCM 185R 229 CID 3.8L 6289593 – 6919655
    MCM 185MR 262 CID 4.3L 6919656 – OA483580
    MCM 185 Alpha 1 OA483581 – OB455459
    MCM 175 Alpha I OB455460 – OB773242
    MCM 4.3 Liter Alpha I OB773243 – OF000000
    Sea Ray 4.3L-2 Alpha I (See Note) OB785483 – B921276
    MCM 205MR 6919687 – OA483776
    MCM 205 Alpha I OA4483777 – OB775129
    MCM 4.3 Liter LX Alpha 1 OB775130 – OF000000
    Sea Ray 4.3L-4 Alpha I OB785981 – B922330

    NOTE: Sea Ray to MerCruiser cross references are;

    • 4.3L-2 same as MCM 4.3 Liter
    • 4.3L-4 same as MCM 4.3 Liter LX

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