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    MIE and R model designations

    My manual refferences MIE and R model engines. What is the difference between these and the standard MCM engines?
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    exhaust shutter part number

    I have a 1984 MCM260 with 3" through hull exhaust. The shutters look pretty ragged, probably original. The manual shows the assembly and gives a replacement procedure, but doesn't give a part number. A quick iboats parts search reveals several to choose from. How do I know which one I need?
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    fuel filter/water separator replacment

    How often should these be changed? I put between 30 to 50 hours a season on our ski boat, so annually seems a bit unnecessary I would think. I just wonder how many hours of operation one of these is typically good for.
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    Timing Chain?

    1984 5.7L mcm260, while watching the distributor rotor and moving the main crank pulley with a rachet in both directions, it appears that I have 6 degrees of "slack" in the system. Is the probable cause a streatched timing chain? I need some advice.
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    5.7L mercruiser 260 valve lash adjustment

    Has almost 900 hours on it. No obvious problems but I assume the valve lash needs to be adjusted by now. First, is that a reasonable assumption? Secondly, what does adjusting the valve lash actually do for the engine in terms of performance? Thanks.
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    Merc 260 low engine vacuum

    5.7L Mercruiser, only pulling a vacuum of 10 at idle (750rpm), should be closer to 20. The timing is right on 8*btdc as it should be at idle. I have leak tested with propane as well as carb cleaner and can not find any leaks. The compression is very good, around 160 on all cylinders. The manual...
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    what is the best way to re-seal the rub rail?

    I have a 1984 Dixie ski boat and it takes on some water from the rub rail. I can see gaps in the silicon sealant on the bottom side of the rub rail. I suspect this is where it gets in. 1. Can I simply re-seal over the existing silicon that is already there? 2. If not, how to remove existing...
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