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  1. J

    Does a new Optimax have a water strainer screen to air compressor?

    I have a 1999 Optimax 200 that has a strainer screen in the water line coming off the block that I have to clean every year because of weeds where we come in to the dock that get sucked up and caught in the screen. My neighbor bought a new boat last year with a 2011 or 2012 Optimax 200. Does his...
  2. J

    Johnson HD25, what year & correct spark plugs?

    I have a Johnson HD25, serial #489636, can someone tell me the exact year? I know they were made from 46-50. Also what is the correct plug for this motor? It's got Champion J-4J plugs in it now. Thanks.
  3. J

    drive-to-housing rubber gasket cut Mercruiser

    1981 Mercruiser Type I drive - I pulled the drive yesterday and found that the big rubber gasket between the stern drive unit and the bell housing must have fallen out of place the last time it was put together, most of the gasket was laying in the bellows and only about 1/4 of it was in place...
  4. J

    Resealing mercruiser outdrive - DIY or not?

    I have a 1980 120 Mercruiser and noticed that it's starting to drip gear lube out the water intake on the outdrive so I've got a leaking seal somewhere. Is this a D.I.Y. job or better left to the pros? I'm a former auto mechanic and have the factory service manual. The manual isn't real clear on...
  5. J

    Please recommend best style of prop for my boat w/115 Johnson (picture inside)

    I'd like the opinion of the experts on this board about my motor setup in the picture below and what style of prop I should be running with this. The boat is a 1978 Cheetah 15.5' fish&ski with a 78 Johnson 115. I'm trying to sell this so I really shouldn't care, but I want to help the next owner...
  6. J

    Please recommend best style of prop for my boat w/115 Johnson (picture inside)

    I'd like the opinion of the experts on this board about my motor setup in the picture below and what style of prop I should be running with this. The boat is a 1978 Cheetah 15.5' fish&ski with a 78 Johnson 115. I'm trying to sell this so I really shouldn't care, but I want to help the next owner...
  7. J

    78 115 help with terminal block connections please

    Hi,<br /><br />78 Johnson 115, model #115ETL78C. My terminal block has 2 wires on it that aren't connected to any others so I'd like to verify that everything is wired the way it's supposed to if someone can help. I have a service manual that covers multiple years, it shows terminal blocks from...
  8. J

    1978 115 making clacking noise

    I need help finding a noise that started on my 1978 115hp Johnson over the weekend. Sorry this is going to be a long post but I don’t want to leave out any info. I hadn’t had the boat out yet this year and am getting it ready to sell, so I cleaned it up, ran it in the drive, and took it out for...
  9. J

    Automotive head gasket?

    Is there any reason an automotive head gasket can't be used for a boat that's never going to be in salt water? The boat is a 1981 model Mercruiser 120.
  10. J

    120 Mercruiser rattling noise in flywheel area

    Hi,<br /><br />I've got a 1981 120 Mercruiser that has developed a noise in the flywheel area of the engine that sounds like a severe metallic "rattle". I'm familiar with automotive engines and would relate the noise to a loose or cracked flexplate on a car. I've been trying to work out an...
  11. J

    120 Mercruiser misses after high speed operation

    Hi, I'm looking for help diagnosing a problem on this 1981 120 Mercruiser with the Chev 4 cylinder engine. It will run fine all day long cruising at slow speeds about 1500 rpm but after any runs at planing speeds it develops a miss on #2 cylinder. After a few minutes of slow speed operation the...
  12. J

    Where can I find temp/speed sensor for Eagle Z-7500?

    Hi,<br /><br />I've got an Eagle Z-7500 fishfinder that I'd like to put a temp & speed sensor on but can't find one. Does anyone have any tips on where I could look? Or is the money better spent getting a new unit? This Eagle seems to be a top of the line model, just getting old.<br /><br...
  13. J

    How to know if water pump impeller is working?

    How does one tell if the water pump impeller in the lower unit is bad? This is a 1981 mercruiser 120. Outboards have the telltale pee hole but I've never heard of how to know if it's working on an I/O.<br /><br />Thanks,<br />Joe
  14. J

    Which Service Manual - 81 Mercruiser 120

    Hi,<br /><br />New owner here of a 1981 Glastron with a 120 Mercruiser (not new to boats, just to this one) and have been looking on ebay for a factory service manual for the outdrive but I'm not sure which one to get. I see ones that are for r/mr/alpha one drives (Mercruiser #6 Manual) but my...
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