Search results

  1. GaJeff

    73 Johnson 50hp blowing exhaust mix in cowl

    1975 Johnson 50hp 50ESL73R Finished a power head gasket set and there was a rubber vacuum boot shoved in this hole... I removed it knowing something like this would probably happen... Here I am. What is this hole for and why did the gasket not cover it? The gasket set is correct for the...
  2. GaJeff

    73 Johnson 50hp lower crank seal position

    Resealing a 50hp Johnson 50ESL73R and removed the lower powerhead seal cap and installed a new seal. I didnt make any reference marks before removing it. The cap has 2 small pin holes on each opposite side above where the I ring goes. Also the block has 1 hole facing the intake manifold. I...
  3. GaJeff

    Mercury 25/2s lower crank wear sleeve

    Replacing the lower crank wear sleeve on mercury 25hp. Removed old one and the new superceded part is to big. I've referred to the FSM and it talks about a coupler not the sleeve. Do I have the wrong part or am I missing something on the install Thanks Jeff Esn-0B281205 Part no. in...
  4. GaJeff

    Low Power on Rebuilt Merc 120

    Hey guys, Just finished up a 100% rebuild on my 81 120. It's running great at idle and does a pretty good job when under a load but it does seem to be low on power. I ran it on the test stand for 2hrs with no problems. Broke in the cam at 1500 rpm for 30mins of that 2hrs and varied the rpm the...
  5. GaJeff

    2.5 fresh rebuild... running rough over 2400 RPMs

    Been working on this engine throughout the winter. It has been fully rebuilt. I started it the first time yesterday and it ran great. I ran it at 1500 RPMS for about 30mins to run in the cam and called it a night. Today I started it and it still runs great but now anything over 2400 RPMs and...
  6. GaJeff

    81 Merc 120 square riser to round riser conversion?

    I have an 81 Merc 120 I/O that I'm rebuilding. One of the reasons for this rebuild besides being tired is water intrusion. I have the square style riser and it's rusted along the top. I was wondering if the round style would fit. I know that it sits at an offset but haven't actually seen one...
  7. GaJeff

    Difference between marine and standard starters?

    I know there is a difference between marine and standard starters and should not be substituted. What are the differences? I know obviously the alternators have the spark arrestors in them but i don'tsee any in the starter. I have a cracked nose cone on my marine starter where the long...
  8. GaJeff

    Orthopedic Fiberglass in Boat Building?

    Sounds crazy to me but I talked to an Orthopedic surgeon today and he said that he uses cast making fiberglass on his sailboat. Of course I though it was extremely funny be he was serious. No resin needed all you do is get it wet and and let it dry and it's as strong as any other fiberglass. He...
  9. GaJeff

    Merc 120 chipped cam gear

    I have a 1981 merc 120 that I tore down for a rebuild. This engine starts up with no problems at all and would idle fine. I put a vac gauge on it to see whats going on because it started to have a bit of vibration in it. Well the vac gauge was jumpy at 19 so I did a compression test. I have...
  10. GaJeff

    Need help with exhaust pipe to gimbal o-ring P/N

    I have an 81 merc 4cyl. just got done doing a resto and putting the engine back in. Im having a hard time finding the P/N for my exhaust to gimbal o-ring. Al the ones ive found look like an upsidedown "U" and are for V engines with a Y pipe. I have a single pipe and my o-ring is an oval. Does...
  11. GaJeff

    Need help with model/serial # identification

    I have a 2001 salt water series 200hp yamaha outboard. I'm swapping this motor in place of a 200hp Johnson. I found the ID numbers for the yamaha so I could download a manual for the wiring diagrams. Well I notice that mine has carbs and the manual states that it should have fuel injection...
  12. GaJeff

    Center stringer? Do I need it?

    I'm redoing the deck and stringers on my 81 citation 19.5'. I have a center stringer and was wondering if I need to put it back. I feel like its going to be a problem for water flow. Can I not just do the two sides and a few bulkheads between them and call it good or go back with what I have?
  13. GaJeff

    Weird electrical issue I solved and would like to share.

    I have an 81 Citation 19.5' Bow Rider. It's all original, same year I/O Mercruiser 120 and MC-1 drive. Over the weekend there were fireworks over the river and the locals like to get on the water to watch. We headed down there and as it got dark I turned on my NAV lights. I noticed as we rode...
  14. GaJeff

    Need help mounting trim tabs

    I have a 1981 Citation 19.5' bow rider. It has a 120hp Merc 4cy engine and MC-1 outdrive. I'm trying to figure how to mount a set of smart tabs on the back but I'm a little stumped. The transom has a bit of a flair from the chine to 12" inboard. From there it recesses in 2" and I have 26" from...
  15. GaJeff

    Lower and Upper Unit Halfs Gasket?

    I am replacing my impeller on my MC-1 outdrive and noticed there is no gasket for the halfs. Should I just put everything back together or skim coat some silicone? Jeff
  16. GaJeff

    Outdrive Toke Seal Leak

    I have a MC-1 Outdrive and am currently replacing my engine coupler and gimbal bearing. Being that the tear down is slow due to funds and time I set the outdrive aside while waiting on parts. I think I may have made a mistake. I had my outdrive hanging on the crane from the top hook. We needed...
  17. GaJeff

    Engine Coupler Question

    81 mercruiser 120hp with MC 1 outdrive. Posted a threa the other day about my prop may have spun a hub. Well my bellows are leaking and my gimbal is growling anyways so I am doing a gimbal bearing and bellow replacement before I do the match-mark test on the prop. I was advised that I could have...
  18. GaJeff

    SOMETHING BROKE TODAY...Need help please

    81 Citation 19ft, 120merc 4cyl. MC1 Outdrive. Went for a ride today with a fellow boater in case I needed a tow... Well I did. Today was actually the farthest I've taken the boat. I was going at WOT about 30mph and all of a sudden I lost all power and the engine revved up to 4500 before I shut...
  19. GaJeff

    New Oil Press Gauge=NO START?

    Hi all... I have an 81 Citation 19ft. With 120Mercruiser 4cyl. Alpha1 outdrive. Just installed a manual oil pressure gauge on the engine. Now it won't start. It will catch for just a sec and die before it kicks up. The old gauge had an electric sending unit screwed into the side of the block...
  20. GaJeff

    Pre Alpha trim motor inop!!

    Hi all, this is my first thread. I just bought an 81 Citiation, 120 Mercruiser 4cyl. Sterndrive. It runs well. Having a problem with the tilt/trim. It was going up but not down. Apparently the PO was jumping off the solenoid to get it to go down. It only has one solenoid in front of the pump...
Top