Search results

  1. R

    possible coil or fuel pump problem

    The issue we are having is. The boat is a1984 mercruiser 120 and it will start all the time with just a tap of the key and run great up to 3700 rpm but when i push it to even 3800 or more it will start to surg and the die off but if i pull the throttle back to 3700 it will even out and run...
  2. R

    opinion on Io WITH WHALE TAILS

    HI guys does anyone have any thoughts about whale tails on an io. We aquired a 17 ft 120 io that has a whale tail on it. Im wondering if i should leave it on or take it off. does it actuly do anything or does it put more stress on the drive and transom. Anyone pros and cons
  3. R

    mercruiser 120 fuel pump filter?

    I am working on 1984 mercruiser 120 I believe it has the oldstyle fuelpump. question is do they have a fuel filter inside the pump or is the water fuel separator and the filter at the carb the only ones. I just got thru installing a new head gasket on it and seems to work great.{thanks for all...
  4. R

    cylinder planing max spec

    I have a cylinder head that is warped and having it reserfaced. Can anyone tell me what the max i can take off without getting in trouble. The motor in a 1984 mercruiser 120
  5. R

    headbolts on a 120 mercruiser

    My fatherinlaw had a impeller go bad, i mean that the brass sleave came loose from the rubber which made the impeller stop spining at high RPM. Damage is cylinder 1+4 are at 130psi and 2+3 are at 80psi when i tested it . So i figured a blown head gasket and when i took the head off i can see...
  6. R

    could this issue be the fuel pump

    Last weekend i took my johnson 70 which is a 1975 out for some fun and fishing and it ran great all weekend. This week i took it out and ran great on Sat but when i took it out on sun it started surging like it was runing out of fuel so i pumped the ball but it was hard, then i backed the...
  7. R

    how to tell if im pumping water thru my engine

    Hi guys. I have a 1975 johnson 70 outboard and am being told that this motor does not come with a tell tail tube for the water pump. I keep the boat in a slip so how do i know if it is pumping so i do not wreck the motor. I know some have a warning buzzer but im sure this is a transplant motor...
  8. R

    steering cables swap

    I have a mid 70s johnson 70 and my question is are the steering cables universel from motor make to motor make. My 70 has a stiff cable and needs to be replace and my son has a cable off a mid 70s merc 115 , will it work if the length is corect or does each make have there own setup. Thanks
  9. R

    sealing a upper gear case on a stringer

    Hi guys . I am in the process of resealing my upper gearcase. I have ordered the seal kit and new impeller kit with the basket. My question is , is there anything i should be looking at or paying special attention to or gasket sealer in any location other than what my book says. I do have it...
  10. R

    internet manuals??

    Does anyone know of a omc for a 1985 3.0 thats on the internet that i can look at without buying. I aready have one just unable to get to it for a couple of weeks.
  11. R

    tune up specs

    Can anyone give me the spec for tuning up a 1985 omc 3.0 with a stringer 400? Before anyone tells me i need a book , i do have one I just forgot it down at the sumer house and the boat is at home 3 hours away. Looking for point gap along with timing and idle. Thanks to whoever can help.
  12. R

    do i rebuild or get a new carb

    I am having a lot of trouble starting my 1985 OMC 3.0 . It is cranky when the motor is cold and almost imposible to start when warm after siting for a few minutes but when runing it runs fine. I noticed that the carb is moist to wet allarou d all the seals so i am thinking ishould start there...
  13. R

    can anyone give some info on starters

    Ok thanks for reading. My question is can i use a automotive starter on my 1985 omc gm 3.0 liter. The problem is that on my last run of the year mine died and is shot but i still need to flush and winterize. So before anyone says it i will not run a auto trpye starter during the season , its...
  14. R

    problem after headgasket replacement

    hi guys I am back again seeking some possibles answers to another problem. the other week I had a headgasket blow on me so i replaced it with no issues and it fixed the problem with water in the cylinders. that being said i thought while i had things apart i would give it a tune up, i replaced...
  15. R

    Just out of curiosity about impeller

    Hi guys what are your thoughts about a stringer water pump impeller being bad but being disguised by someone using the muffs on city water. In other words will a bad impeller show up while using muffs, any thoughts?
  16. R

    Ok guys i water in oil 3.0 help

    I need a little help giguring out where it is coming from. I took the boat out 3weeks ago and no problem then today i t staredup then stalled but got it running and started out for the day. about 1/4 mile from my saltwater slip it started acting funny and the rpms stared to bounce around...
  17. R

    Need some help with specs for a 3.0

    My motor is a 1985 OMC 3.0 I did replace all the tune up parts like plugs wires cap and points and condenser . I have the points set to 18.000 and the plugs to 35.000 , but my question is what should the dwell and timing be set to? Thanks in advance
  18. R

    Kind of a wired problem with a 120 merc

    Hy guys I have kinda a wired problem with my father in laws 1986 merc 120 , it runs great on nice smooth water starts good at wot and idle but when you get into rough water like in a inlet or choppy water it acts like it is running out of fuel at wot , but if we back the throttle off even to 3/4...
  19. R

    need a little help on a 3.0

    I have a 1985 , 3.0 with a 400 stringer drive trying to chase down why i do not have more than 23 mph at 3800 rpm. This is what i found my dis. Cap is very worn and it need plugs. First question is what is the plug gap i know the pints are 18.000. Also i do not think the shift interupter s set...
  20. R

    what speed can i expect

    I have a 19 foot bowrider 1985 with a 3.0 stringer drive. The prop is a 3 1/4 x 17 pitch which runs at 39-4000 rpm wot trimed. I recently got the boat and have no idea what speed is normal for. Right now it runs about 23 on my gps, i think this is kinda slow but hopfuly someone will chime in...
Top