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  1. R

    Ohm reading interpetation

    After running the appropriate tests, my fuel gage is shot! The ohm readings on the sending unit, which is stamped 240 ohm, is 255 and will go no lower than 61at which time my fluke tester goes to OL. is this reading OK?
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    Thunderbolt ignition modules

    Just picked up two thunderbolt ignition modules. The number on the modules are 6E03A V8-24 on one and 5f09a V8-24 on the other. What engines can these modules be used on.
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    i/o tachometer for an ob

    My tachometer just went haywire on me. The boat is powered by an Evinrude150 hp. I have a gauge cluster which includes a tachometer from an i/o. Now I know that the ob tachs will measure 8k and the i/o's top out at 6k. So, since I already have the i/o tach can it be used successfully on the...
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    Odd trailer hub size

    Needed to replace the hub on an OLD tandem boat trailer. Figured it would be an easy replacement but not so. 1 inch spindle size and it is 4.25 inches long with 1.25 inches of that being the threads. Old hub and replacement hub are the same length (4 in). New hub fits the spindle but...
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    Corrosion?

    Getting ready to install the new plywood transom in my aluminum sylvan. I need to order splash well drain tubes. Probably not plastic, but I see a lot of brass for this procedure. Is there any reaction between aluminum and brass or should I just play it safe and order aluminum? I don't...
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    Attaching splash well back to transom

    After 4 days of off and on work I was finally able to remove the rotten wood in the transom of my 21' sylvan super sporster. Contorting myself to remove all the screws and bolts was the easy part. The rotted wood ply was sandwiched in between 2 layers of aluminum and was so swollen it wouldn't...
  7. R

    fabricating engine mount supports

    After blowing my engine(3.7/485) and outdrive the decision has been made to repower with a 5.7 260hp. And appropriate 1.5 outdrive. As my Grady White's stringers are 26.5" apart on center I will have to do some fabricating as the 350 engine mounts are 22.5" apart. Was thinking the simplest way...
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    5.0 or 5.7 mercruiser

    OK, will spare all the naughty details but I destroyed my engine and outdrive in my 1982 Grady White Tournament 224. Had the Mercruiser 3.7 485 in it. Yes I could replace it with the same setup which would be the easiest to do, but maybe not the smartest! I'm in all likelihood gonna go with a...
  9. R

    engine, lower unit or starter?

    Finally got my mercruier 485 3.7 in the lake. It's an '82 so it has a pre alpha outdrive. Got it up to 4000 rpm's for a minute or so when we started hearing strange sounds and seeing smoke appearing from behind the transom along with somewhat of a burnt rubbery fragrance. Quickly dropped the...
  10. R

    replacement for 3.7

    My Grady Tournament 223 has a bad mercruiser 485. I've done a lot of research on this engine so I'm well aware of it's idiosyncrasies and what needs to be done with the stringers for motor mount placement as well as what out drives to use if I switch to a V6 or 8. I'd like more power than what...
  11. R

    motor mount support

    I may have to either rebuild or replace my 3.7 485 mercruiser. I'm leaning toward replacing it with a 4.3. Now I've done a lot of research and realize this would not be just a drop in scenario as the 3.7 is front mount whereas the 4.3 has it's front mounts on the sides. My 2 stringers that...
  12. R

    low compression then high compressionver

    My 3.7 485 appeared to lose a couple hundred rpm's at wot over the last month of the season last year. 157, 155, 163, 55. Yes, 55. Didn't have any oil handy to squirt into the cylinder to see if that raised compression. Nice day today here in WNY so took advantage of it and rechecked...
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    4.3 motor mounts

    I have low compression on cyl #4 on my 3.7 litre 485. Thinking of either a rebuild of the 485 or replacing it with a 4.3. I know the 3.7 has a front mount while the 4.3 is side mount. Question is how wide apart are the motor mounts on the 4.3??? The Grady White tournament 223 has two...
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    3.7 HP rating

    Hi, just curious but were all 3.7 liter mercruiser HP ratings done at the fly wheel or prop. I believe that at some point in the 80's the rating might have changed from the flywheel to the prop. If so, would an early model 470's HP be different from a '89 170 hp
  15. R

    QD 17 overheats

    Several years ago I picked up this motor(QD 17) at a yard sale. It started right up but no water was coming out of the pee hole and the motor started getting hot so I shut it down. I removed the bottom end and checked out the impeller which looked to be in good shape but I replaced it...
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    motor shuts off before throttle lever reaches "STOP"

    My mid '50's Johnson 7 1/2hp runs pretty good. When starting, I place the throttle lever to "start", pull the cord and bingo--it starts right up. However, I can get it to run slower but the motor will stop well before the throttle lever even gets close to slow! Is there an adjustment, or...
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    carb/choke setups

    My 1976 Evinrude 200hp was always hard to start. Consequently, it's not very dependable. On the other hand, my 1982 Evinrude with 150 hp, starts with a turn of the key. I've heard that there are different choke/primer setups on these motors that might account for this. If so, would they be...
  18. R

    relays or solenoids

    I am redoing a 2 wire tnt setup. I have relays, solenoids, wire, etc. all the necessary components to finish the job. Personally, I'd rather use solenoids rather than relays----pretty much because I find them easier to wire up. Will solenoids do the same job as the relays?
  19. R

    OMC 3 wire tnt pump to 2 wire control system

    Had to put an evinrude ob with a 3 wire tnt pump on a boat with the later 2 wire setup. I read many posts but still no luck. Everything works as it should when direct connected to a battery. I tried Faztbullet's advise from another thread, see below,. The existing relay box is actually 4'x5...
  20. R

    engine removal

    I need to remove a 1982 Evinrude 150 hp from one boat to another. I have a tractor with loader so lifting is not a problem. However, there are no attachment points to hook a chain or rope up to. I was thinking of a rope or strap around the bottom of the heads and another underneat the from...
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