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  1. M

    Leak Down Test

    Would someone please explain what this is and why is it used on an old mercury engine. Thanks, Mike
  2. M

    Mer 500 50 HP 1977 Need Help with fuel pump

    I took my upper carb off to find out what is wrong with it. Not getting enough gas for idle. The fuel pump kits I have installed on it all have two check valve diaphragms and the manual shows the use of only one of them. There is one made of thin rubber like the main diaphragm and one made of...
  3. M

    Wits End on Lower Unit .Please Help.

    I have been carefully rebuilding my lower unit on an older Merc 500. 1977 vintage. I have replaced every seal (some of them twice) and replaced the needed bearings ( all). I have tried to follow the manual (mercury) and done my due diligence but upon checking my gear oil after each usage, I come...
  4. M

    Just one more quick Question.

    I took a good look at my oil fill vents on my lower unit and what I found was a mess. I used a dremel tool to smooth them out and went to the Hardware store and bought rubber o rings. I used them for the gaskets on the new screws to get a positive seal. I was told that that wasn't a good idea...
  5. M

    Quick Question on a 1977 Mercury 500.

    Update!...............................................Just reassembled my motor ( Installed the lower unit), and want to check for proper shift (forward, neutral and reverse). I have always started it to check but want to know how I can tell if I don't start it. As I write, the shift lever fully...
  6. M

    1969 Mercury 500- Gift?

    I was recently given an old 50 HP Merc motor. I was told the motor was in good running condition when it was abandoned several years ago. The owner passed away and a neighbor "rescued" it. It is dried out to the point of being hard to turn with the plugs out. What I would like to know is what to...
  7. M

    MinnKota Auto Pilot 1994 Need Owners Manual Badly

    I recently bought a used trolling motor with no manual from a widow that knew nothing about it. It has some features on it that I never thought I would need but I have to get acquainted correctly because the ladies brother took the wires off the old boat and cut them in a few places...
  8. M

    Lower unit Pressure test pump- needed

    I would like to know where a person could purchase a low pressure pump to test the newly installed seals on a lower unit. Thanks, Mike
  9. M

    1977 Mercury 500 Thunderbolt W/ Weak stream

    I have a 50 HP mercury with a very weak coolant stream from the pump. Just removed the lower and expected to find a badly worn impeller, but it looks just fine. I haven't experienced any overheating problems but thought the pump would need some help since everything else needed attention before...
  10. M

    Working on 77 merc 500 Lower unit Help with Repair manual

    I need to do some work -water pump and seals on a lower unit. What repair manual do you recommend.
  11. M

    50 HP Mercury OB Thunderbolt

    Is it possible to damage a new stator if the trigger is faulty. Need to know before I install the new stator. Not clear if the trigger is the problem.-Thanks, Merc
  12. M

    1977 Mercury 500 Has intermitent power loss and starts hard

    Purchased an older Sylvan with a 50 hp Mercury and when it went out on a test run it ran smooth but would do no more than 5 mph. So far I have cleaned and adjusted the carbs and replaced the bulb and hose, and the spark plugs. Found out the throttle linkage was a mess so had that redone.Now the...
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