Home › Forum › Ask A Member › Mercury Mark 55 Help
- This topic has 7 replies, 4 voices, and was last updated 8 years, 9 months ago by dave-bernard.
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July 14, 2015 at 12:11 am #2008
I am just needing someone that I could ask questions to as I start going through this motor. There is plenty of information available for OMC engines, but not as much for the Mercurys. I was going to sell this motor, but the more I look at it the more I want to get it running. Currently I have no spark and I do not know how to work on this type of magneto. Aslo will the wiring harness on the front of the motor keep the mag from giving spark?
July 14, 2015 at 1:36 am #20100There is a insulated bolt on the distributer that shuts it off. If you have no spark remove the distributer & clean & reset the points. It hangs upside down & the bearing may be leaking oil on the points.
July 14, 2015 at 2:39 am #20110I hope you do get it running. There’s nothing like the old Merc fours. They run great.
I find it is easier to work on the magneto if the motor is set on its head. Then you
can see a lot better. It should have a Fairbanks-Morse magneto, point setting .010 +.000, -.002, ie a tight .010. Plugs should be Champion J6J set @ .025, or better Jap B6S, IMHO.Jeff knows all about these motors.
Good luck, JW in Dixie
July 14, 2015 at 1:02 pm #20124call me if you need help
1 914 310 7086
Dave.July 14, 2015 at 3:18 pm #20130Thanks J.W,
I believe Dave & J.W. know more than me. My last 4 cylinder motor came from J.W.
Thanks so much!!July 14, 2015 at 4:50 pm #20134RE: "My last 4 cylinder motor came from J.W."
But I had not run it. SO, have you run it?
Best regards, JW
July 14, 2015 at 8:52 pm #20150Well I pulled the magneto and found it to be very dirty. Pretty sure the coil is good because it shocked me when I spun the splines by hand (accident). I dressed the points and set them with a multi meter because I am not good enough to do it by hand at.010. The mag cover is cracked so I will need another one of those. I put it together and checked spark and it fire a blur spark 7/16". Squirted a little fuel in the carb and she fired and ran on the first pull for about 5 seconds.
Now I need to figure out how to get the prop off. The lower unit is frozen and I cant get the prop off after I take off the nut and the tab washer. Is there a secret. I used lots of PB Blaster and some heat and light prying. No go. Is it easier to find a different lower unit if I can get the prop off of this one?
July 14, 2015 at 9:24 pm #20153call me about the prop and lower. 1 914 310 7086.
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