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  1. ScottinAZ

    FACTORY PARTS..... a bit of a rant....

    Ok, this is going to be a bit preachy, and a bit of a rant... USE FACTORY PARTS folks.... I just got done replacing a bunch of cheap Chinesium parts on my boat. These parts have LESS THAN 15 HOURS run time on them. Lower shift cable especially. When old timers say that the Mercruiser part is the...
  2. ScottinAZ

    STUCK gimbal bearing.....

    started beating on my gimbal bearing yesterday to replace it, and am having NO luck. Searched and found this thread https://forums.iboats.com/threads/gimbal-bearing-removal-trick.704454/ and have used up just about all the good advice in there. I had borrowed a slide hammer set, which had the...
  3. ScottinAZ

    Gimbal Bearing Alignment/Installation Tool Question

    Need to replace a janky gimbal bearing. I have the tool, but its not drilled for the installation mandrel, that is left to the "installer" to deal with. What I need to know is where on the shaft does the hole get drilled to put that part on? I checked the FAQ section, but I did not find this...
  4. ScottinAZ

    losing forward gear after running a while

    Having a REALLY annoying issue with the drive on my boat (1980 Merc 120 with MC (? its factory....) drive) when first starting out at the lake, or testing at home, I have forward and reverse, no issues at all. Push the side control forward, or rear to the detent, and it engages just fine, no...
  5. ScottinAZ

    Thrust washer…..

    When changing between props and prop brands is it usually necessary to change/replace the thrust washer, or are the props made to work with the “stock” washer unless otherwise noted? Last outing we spun the prop, leaving some wear on the thrust washer. Now I’m slightly gunshy about the setup...
  6. ScottinAZ

    spun prop hub, or bad coupler... how to easily tell the difference....or can you?

    ok, went out to the lake this morning, ready for a morning of enjoyment and boating. Pulled off of the dock, got up to about 3200rpm cruising speed and all was well for about 5 minutes, then the RPM took off, and the boat dropped off plane. No obvious sounds from the engine bay, and no smell of...
  7. ScottinAZ

    does this prop seem "reasonable" for this combination?

    not trying to fix an issue per se, but see if what I have is "reasonable" given the combination that I have. Boat is a 1980 vintage 16' vhull bowrider with a Mercruiser 120 engine, MC-1 drive (1.98 ratio?) prop that is on the boat is unmarked in any way that I can find (nothing under the mount...
  8. ScottinAZ

    Finally back on the water

    first a bit of backstory. Bought a boat just over a year ago now that was a known project. Hadnt been on the water for about a decade, the interior was shot, and as it turns out so was the floor. Core samples on the transom and stringers came back good, foam tested as drier than a popcorn fart...
  9. ScottinAZ

    Replacing bunks with boat on trailer (too far to get to lift or splash)

    ok, boat and trailer have been out of the water since at least 2013, and the bunks are shot. Since I live about 40 miles from the nearest water to splash the boat (finishing rebuild), I would like to replace the rotten bunks with new wood before towing a longer distance. (the wood is REALLY bad...
  10. ScottinAZ

    MerCruiser throttle cable

    Not having any luck finding the type throttle cable I need. Goes on a 1980 120 MerCruiser 4 banger. Serial number and carb end of cable are in the pics. Manuals have been no help, same with exploded diagrams… Anyone got any ideas here????
  11. ScottinAZ

    minor hole repairs

    filling in some un-needed screw holes in the boat, (speedo senders, fish finder transducers and such, small screw sized holes, and yes, I feathered it out to about 3" around the hole in question) and have a quick question. I am grinding back the glass (gelcoat is shot, will be sanding, priming...
  12. ScottinAZ

    carburetor options.... mine is toast.

    carb in question is a small base 2gc, P/N 17059054 off a 1980 Mercruiser 120 4 banger. This is to the best of my knowledge the original carb. Well, the accellerator pump is shot. The checkball at the bottom of the passage is corroded in there but good, cannot remove, and no shot of fuel when...
  13. ScottinAZ

    Doghouse reconstruction

    I am at the point of my rebuild where I need to remake a doghouse cover for the engine. Originally the doghouse was just plywood, fiberglass and some sprayed in foam for noise abatement. Personally I feel this is inadequate and a fire hazard. I am considering building a frame out of angle...
  14. ScottinAZ

    blower CFM needed for proper ventilation

    Boat was a basket case when purchased, blower motor was there, but no specs really on what it would push. Ducting is 3". I have two vent ports on the rear deck of the boat, one facing forward, the other aft. What is the "proper" routing for the hoses, or does it not really make a lick of...
  15. ScottinAZ

    mounting a bilge pump

    ok, this is gonna come off as a stupid question, but Im gonna ask anyways. What is the best way to mount a bilge pump to the hull? Existing pump when I got the boat was just lying loose in the bilge, not attached to anything. No obvious mounting pad to screw down into either. I have a couple...
  16. ScottinAZ

    Almost back together, but a shifter issue

    Ok, after a bit of a hiatus waiting for exhaust parts, I have the 120 in my boat back together and tuned. running great now and no water in the oil from a burned out riser. Give it two pumps of throttle, and it starts right up, happy as a clam with this. \ now for the issue. Installed the...
  17. ScottinAZ

    water in all 4 cylinders

    Engine is a 1980 "ish" vintage Mercruiser 120 S/N 5612859. During testing for re-commissioning, I am running on hose water hooked direct to the inlet hose (no drive installed). Engine runs good, but am getting milkshake in the crankcase, and when I pulled the plugs this morning, and cranked it...
  18. ScottinAZ

    converting from ammeter to voltmeter

    ok, boat is a 1980 vintage galaxy with Mercruiser 120 running gear. I have manuals for the system. I have an unnatural hatred for ammeters, I just dont care for the idea of a single wire running the length of the boat, through the gauge, and back to the battery. too much length for something to...
  19. ScottinAZ

    re-wiring the boat

    ok, as part of a larger re-work on my boat, I am re-doing all the dash wiring. What was there makes a rats nest look organized, and I can also get rid of the individual glass fuse holders and go with a more modern style fuse in a fuse block. What I "think" I need are the following circuits for...
  20. ScottinAZ

    MC-1 Trim Pump issue.

    ok, we are working on a 1980 vintage 120hp MC-1 trim pump. Metal reservoir with external control valve. I have function in trim-up but nothing in trim down. I am bleeding the lines at the moment due to it running dry over the previous 9 years since it had last operated. Reverse lockout and...
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