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  1. J

    MerControl Shifter Problem

    I am still having some problems with the shifting on my 1974 Merc 500 engine. My Mercontrol shifter shifts into forward after the forward detent, and shifts into reverse after the reverse detent. Is there any way of fixing this or adjusting this. I check all the parts and replace the...
  2. J

    What part is this?

    I got a 1974 Mercury 500 thunder bolt with lightning energizer ignition and I was just wondering what part this is in the picture I have attached and circled in green. I just finished rewiring the internal engine harness so that I can attach any tach I want using the rectifier wire. And I...
  3. J

    Mercury Tach Module Wiring

    Hello Having trouble finding stuff on the net about this. I am trying to wire up the tach for my boat but not quite sure which wires to connect and where. In the following picture I got numbers for the wires if anyone can help me connect them. Also there is this tach module which I dunno if I...
  4. J

    Mercontrol Cable Travel

    I got a 1974 merc 500 50hp with mercontrols. Got forward nuetral and reverse working on the shift shaft and I hooked up the cables and can't get the shifting positions to work. If I am in the netral detent on the control box and the shift shaft and switch to forward, I gotta go slightly past...
  5. J

    Mercury Lower Unit Threads

    I got a 1974 Mercury 500 50hp and I took apart the lower unit cuz reverse didnt work. I am in the process of hopefully getting it back together. I just have to tighten down the bearing carrier and there are 2 sets of threads there. A smaller diameter hole with threads closer to the gears, and...
  6. J

    Mercury 500 No Reverse

    Hello I got a 1974 or 1975 mercury 500 50hp and I got no reverse. Tracked it down to the lower unit. I can shift the shift shaft into forward and nuetral, but when it comes time for reverse the reverse gear doesnt quite get close enough to engage the pinion gear but it is sliding. I am...
  7. J

    Normal speed at full blast?

    Round 2 of testing the engine. Got the 15' boat up to 42kms/h on the 1974 mercury 500 50hp. The prop has some nice sized dings outta it, but other than that, is that a normal speed for full blast? Also went through about 20 liters of gas in about and hour of run time. Is that normal? I try...
  8. J

    Should I hear shifting?

    Having some trouble finding the topic I need in the forum so I will just post. I got a 1974 or 1975 Mercury 500 50hp engine and I got it up and running in a garbage pale of water. There is no prop installed at the end and when I get it idleing smooth the water in the garbage can is very...
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