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  1. M

    spark test

    what is the best way to field test for spark on a early 70's merc 115 straight 6 cyl.By field test i mean is there a way to ground the plug and turn the engine over and see what quality of spark i am getting ( or no spark at all ) and is there a simple device one could build to test the spark...
  2. M

    the problem was...

    my merc 115 6cyl problem may be solved, i have had fuel issues and thank you to all who supplied info. It turns out when the boat shop rebuilt the engine & carbs 6 years ago they left a plastic carb parts bag in the intake & reinstalled the carbs so my top intake has been plugged on one side and...
  3. M

    carb question

    i have a merc 115 6cyl been having fuel problems & got a lot of help in diagnosing the fuel issue from this site. I have done the test to see if i am getting air in my fuel line & it came up clean. I went ahead & disassembled the fuel line & check the ball checks & they all are functioning i...
  4. M

    fuel delivery problem ?

    tried to post earlier & something happened i apologize if there is an incomplete posting my merc 115 6 cyl bogs down when i throttle up and the gas bulb collapse a guy at the duck said my bulb had a hole and another guy had some duct tape so i taped it up and took it out for a test spin. The per...
  5. M

    thank you

    just to update everyone i had the merc 115 w/17p prop problem i know there's alot of them out there but i recieved a lot of good advice and help from this forum and want to thank all of you i have since acquired the proper prop and installed it along with changing the impeller it appears it will...
  6. M

    water tube installation

    ok i had a bad prop & have acquired a quality replacement for my early 70's merc 115 6 cyl. I have installed anew impeller & have been trying to get the lower unit back on for 2 days. I can get it within an inch or so and after removing the lower unit & checking up inside to see if any...
  7. M

    impeller rotation

    i have a early 70's merc 115 6cyl and am figuring out how to re-install the lower unit after replacing the impeller & i am cocerned about the sains on the impeller getting cupped the wrong way if i rotate the prop & shaft in order to get it to line up so the lower unit will mate to the mid...
  8. M

    lower unit problem ?

    i have a merc 115 6cyl early 70's model i had a prop problem & have gotten a new prop while i was at it it was suggested to change the impeller i have seen this done & also did some research plus talked to some people in the know about changing the impeller. I removed the lower unit,changed the...
  9. M

    gearcase problem ?

    started out with a bad prop & now i"ve been directed to this section for the next question about the current problem. If this is the wrong forum i apologize, but the prop section said to post here. Anyways i have acquired a new prop for my merc 115 6 cyl. it was suggested i change the impeller &...
  10. M

    need some gearbox help now

    thanks for all the prop help now i have a new situation along with the new prop it was recommended i change the impeller & as it made perfect sense i went ahead & bought an impeller. Took the lower end off,changed impeller etc, attempted to reinstall it & went well until the last inch or so went...
  11. M

    a little more help for the newbie

    1st off thank you for all the previous info. What i would like to know is about a prop and am having trouble navigating this website so i apologize if i ended up in the wrong catagory. I may need to replace my prop due to a spun hub on a merc 115 blue band my # is 48 77344 a40 17p a guy has a...
  12. M

    please help a newbie out

    i have a merc 115 thunderbolt i believe it to be an early to mid 70"s it is on a boat that was given to me i know the previos owner well and have been out in the boat many times. In the past the motor was always difficult to impossible to start once it was in the water i pretty much resolved...
  13. M

    what's going on

    new to this site but like the way everyonel conducts themselves so i joined. I have a merc 115 thunderbolt on a boat that was given to me and i know the previous owner very well & have been out on the boat plenty of times and it always had trouble starting once in the water. O.k. i have pretty...
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