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    1998 Merc 150 rebuilt. My tac suddenly doubles it's reading- wired properly-any

    My 1998 Merc 150 was recently rebuilt. Engine running good and have recently finished break in. Lately the tach reads approximately double of actual RPM. Then sometimes it gets back to "near" normal, but I don't beleive it's correct. Any Ideas?<br /><br />Thanks for your time.
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    Mercury V6 150 Operating Temperature

    What is the normal operating temperature for a Mercury V6 150? What temperature begins to become dangerous for operation?<br /><br />Thanks
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    WOT Timing vs Cranking Timing

    Good day again!! I set my "cranking timing" with a fully charged battery (plugs out/grounded)to service manual specs. <br /><br />1998 Mercury 150 v6 - cranking timing 21 degrees BTDC. WOT timing 17 degrees BTDC. <br /><br />The engine runs great, idles very smooth and quite, good throttle...
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    Just converterd to oil premix - help me disconnect the oil injector horn.

    Good day all! I just rebuilt my 1998 Mercury v6 150 and disabled the oil injection and have gone to oil premix in the tank. Can anyone advise me how to disable the alarm. I've disconnected the sensor to the oil injector "cap" and the oil motion sensor for the oil pump shaft by disconnecting the...
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    grounding plug wires????

    When checking compression on a cylinder or when performing timing (timing light) on cylinder 1, Do you need to ground the other plug wires? Why?
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    Mercury 150 Ring Gap .040 (STD) on honed cylinder within tolerance - is this OK.

    My Mercury 150 siezed a piston. After honing the cylinder (very light scaring) I was left within the specs of allowable tolerances. (STD. = 3.125 +.006 toelrance). The cylinder reads 3.129 with a high quality cylinder dial. <br /><br />The ring gap for this engine is between .018 and .025 max...
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    Stupid Merc plastic drive gear

    Does Merc (or a third party) make a replacement drive gear for the oil injector system that's not plastic? (1998 Merc 150 standard) <br /><br />This engineering design compares to GM's design on the window regulator. (Stupid) There, got that off my chest. <br /><br />I'm about to put back...
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    Can I use an auto timing light on my Merc 150

    I will be timing my Mariner 150 next week. Can my induction timing light for my auto work?
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