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    79 140 hp Mariner, reverse kick up

    Serial # 5443137. When I shift to reverse and give it some throttle the engine kicks up. Also will leak down slowly from a raised position. Takes approx. 5-8 minutes to leak down. I have tried turning the reverse lock knob on Tilt/Trim pump both ways and still does it. Could this be leaking...
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    1979 140 Mariner CDI ignition coil replacement

    I just received a replacement coil, Part #18-5186 which replaces Mercury part#339-7370. The package included a iron cylinder with hole in middle. I assume it is some sort of choke for Spikes or electrical transients, my question is, does it apply to my 6 cylinder or is it for another make of...
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    prop trueness critical?

    I have a 18' Smokercraft w/ 140 hp Mariner(79), just bought a new prop 13 1/4" x 17 deg. to replace a 13" x 19 deg. I was told this would make my boat run better at higher elev. I run anywhere from sea level to 6000 ft. I put the new prop on and checked the run-out, did not use a dial...
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    17 volts to battery.

    I have a 1979 140 hp Mariner that is putting out 17 volts to the battery when running. I have not verified this with a voltmeter, but my depthfinder indicates 17 volts. It's not real consistent, as I increase RPM's it seems to drop off a little to around 14 volts. This seems a little high but I...
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    Power trim pump problems

    Hi, My power trim just quit working on a 79 140 hp Mariner. I just bought this boat about 3 weeks ago and have been going thru it fixing stuff, had just about everything under control, and pulled it outside to run the motor with muffs. Got ready to push it back inside and the motor would not...
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    79 Mariner 140 hp shaft fretting

    I just dropped the lower unit to replace the water pump impeller, I noticed on the end of the drive shaft approx 1/2 to 1" below the spines that there appears to be some wear/fretting. It looks like a shaft that has been turning in the inner race of a bearing. Is there a roller bearing up...
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