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  1. R

    MerCruiser 120 1968 2.5 not idling tight

    Thanks, I cleaned the fuel tank first thing when I got the boat. The boat did not have a fuel filter so a few weeks ago I put a fuel water separator on it. I pulled the fuel pump out an cleaned it and now it’s running good again. Hope it stay running good! Thanks for the tips!
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    MerCruiser 120 1968 2.5 not idling tight

    I just pulled out the mechanical fuel peel pump, looks brown and gritty the diagrams look good. I would you recommend I clean the fuel pump? Thanks!
  3. R

    MerCruiser 120 1968 2.5 not idling tight

    It’s not idling right, rough and when I give give it some gas and it quits.
  4. R

    MerCruiser 120 1968 2.5 not idling tight

    Hey All, I have this 1968 I’m restoring and got and issue with a rough idle and when I give it a little it stalls. I’ve changed the plugs, coil condenser, points and rebuilt the carb. After I rebuilt the carb it ran great then a couple weeks ago it started having this issue. It did not have a...
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    1968 MerCruiser 120 starts but won’t run

    Wow, spell check in the wrong, it’s I don’t have a fuel pressure gauge and it has plenty of fuel. It runs now after putting a USCG hose and a spin filter on. Seems to have a small Drip of gas around the linkage somewhere. I tightened the screws on the carb and I’ll check in the morning to see if...
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    1968 MerCruiser 120 starts but won’t run

    Not sure what the psi on fuel supply as I don’t have a haulage but when I removed the hose to replace it plants of fuel drained out.
  7. R

    1968 MerCruiser 120 starts but won’t run

    Thanks, what is a spin?
  8. R

    1968 MerCruiser 120 starts but won’t run

    Thanks!! I’m heading out to get USCG approve gas line. The carb was rebuilt a couple of weeks ago. Would it help if I use carb cleaner? The boat does not have a fuel filter. I’m sure it will help if I install a inline filter. I also replaced the large water hose connected to the thermostat. It...
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    1968 MerCruiser 120 starts but won’t run

    I’m hoping to get some help getting my old boat on the water, I’m fixing up a 1968 Glasspar with a MerCruiser 120 2.5. I got the engine running a few weeks ago after cleaning out gas tank and fuel pump. I rebuilt the carburetor changed points, condenser, plugs and coil. It’s been running great...
  10. R

    1968 MerCruiser 120 sterndrive water pump

    Okay thanks I’d like be be able monitor the water exiting. I see videos where there is a lot of water, when I let the engine warm up the temp gauge reads low end of the green. Is that a good indicator or do I need to see a lot of water? I’ll keep looking for the exit ports.
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    1968 MerCruiser 120 sterndrive water pump

    Maybe I’m not letting the engine get hot enough for there to be a good flow of water exiting the ports?
  12. R

    1968 MerCruiser 120 sterndrive water pump

    looks like a zinc plated down there are they around that ? Also , is there a constant low of water exiting the thermostat or just when hot?
  13. R

    1968 MerCruiser 120 sterndrive water pump

    Thanks! I just don’t see them?
  14. R

    1968 MerCruiser 120 sterndrive water pump

    I removed the hose going to the thermostat and looks like plenty of water coming out when started. Where are the relief ports or where should the water be exiting the transom?
  15. R

    1968 MerCruiser 120 sterndrive water pump

    This is an old out drive I thought water flows out the rear top end of the out drive and exhaust out the propeller?
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    1968 MerCruiser 120 sterndrive water pump

    Could it be a bad thermostat?
  17. R

    1968 MerCruiser 120 sterndrive water pump

    water is spitting out of the muffs nothing from the prop.
  18. R

    1968 MerCruiser 120 sterndrive water pump

    Just got the 120 engine running great. Starts right up but when I put the water muffs on I’m getting ticking from the stern drive and very little water exiting. I’m not sure the impeller is is working. Any ideas on the ticking and low water flow? Thanks!
  19. R

    Mercruiser 120 no spark to plugs

    I have a 1968 MerCruiser 120. First it would not crank over. There is a shift interrupt switch inside the gear shifter lever assembly I bypassed that at the ignition switch. Now it cranks over. But there is no spark when I pull a plug and ground it and crank it over. I replaced the points...
  20. R

    MerCruiser 120 Compression low in one cylinder

    I have a 1968 MerCruiser 120 2.5 in my restoration Glasspar. I just did a compression check, all pugs out, throttle open wide. I have 3 cylinders with 120lbs and one cylinder with 100lbs. I have not started the engine yet. It needs points, plugs, etc. How does this impact how the engine runs...
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