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  1. Scott Danforth

    Water in oil

    Rain won't get into the motor unless the whole motor was underwater Is this a salt water boat? How was the boat winterized? Most Mercruisers after 2000 have a drain hose connected to the garboard plug.
  2. Scott Danforth

    4.3 runs great for about 30 minutes then bogs, pops won't accelerate

    It's never the coil
  3. Scott Danforth

    My boat run slowly. 120HP,2.5L,1989

    Find a 3.0 and Alpha 1 Gen 2 and drop in. Plenty in rotten Bayliners Will be less than rebuilding what you have, even paying customs, VAT, etc
  4. Scott Danforth

    VP 4.3GS Carb Tuning Vacuum Port?

    What sized Holley? 4150 or 4160? Did you verify the idle transfer slots when you had the carb off If your fouling plugs, you are too rich Start at 3/4 turn out at mix screws. Make sure the float levels are set (external adjustment) When you had the carb apart, did you make sure the air...
  5. Scott Danforth

    hei ignition retrofit

    Only one I know that is marine rated is DUI. Davis Unified Ignition
  6. Scott Danforth

    Mercruiser won't go above 1000 rpm.

    What is your fuel pressure?
  7. Scott Danforth

    hei ignition retrofit

    Who's HEI setup?
  8. Scott Danforth

    transom repair options

    Won't work, but it's your life. And you could never dry it out even if it sat in the desert for 10 years
  9. Scott Danforth

    VP 4.3GS Carb Tuning Vacuum Port?

    I was taught the technique in the mid to late 70s lol. By the same hot rod shop owner that taught me to rebuild Holley carbs
  10. Scott Danforth

    1986 seaswirl nightmare

    Start by servicing the impeller
  11. Scott Danforth

    Close on the formula

    A 10243880 with a mechanical pump?
  12. Scott Danforth

    Prop size 1989, Mark cruiser, 3.7,18.9

    Take your current prop, and do a run, 3-5 miles at WOT, then come back the other way document your RPMs and your speeds. If you are getting 4600-4800 RPM, the 19 pitch prop is correct
  13. Scott Danforth

    2001 190XL Depth Gauge

    Problem is when skiing, by the time the alarm goes off for depth, you are usually shining the prop.
  14. Scott Danforth

    VP 4.3GS Carb Tuning Vacuum Port?

    I get better luck with an unlit propane torch by waving it over a carb If you add a bit of propane at idle and the speed increases, back the idle mix screws 1/8 turn. If you add propane and the idle drops, you are rich, and need to turn the screws in 1/8 turn
  15. Scott Danforth

    Finding out my engine type without serial number.

    It's a 3.0 Check your idle speed and timing, and cooling system If your timing is advanced, or you are running hot, it will diesel (run-on) Let idle for a minute before keying off. That should prevent it from running on
  16. Scott Danforth

    Deep Cycle battery polarity issues (24v)

    I have had dead batteries that were charged backwards (sibling in charge of charging the battery) Hooked a 12 volt light up to the battery, let it drain down to zero, then charge it correctly I would be looking at the battery charger and wiring
  17. Scott Danforth

    Marine Engine Depot

    Everyone except Mercruiser has been using LS motors since about 2008. The LT motors since 2014 as they source the longblocks from GMPT
  18. Scott Danforth

    My boat run slowly. 120HP,2.5L,1989

    You need a dwell meter to set dwell https://forums.iboats.com/threads/how-to-troubleshoot-a-points-ignition-system.328601/ If you do the assembly labor yourself, about $1500 for a rebuild If you pay for the labor to tear-down, clean, inspect, and reassemble. About $2500. However with you...
  19. Scott Danforth

    Volvo B20 water in oil

    And bolt to what? The B20 PDS housing will not bolt to a GM motor. And the transom shield is a 4-cylinder only setup You need VP AQ series PDS housing and transom shield from behind a V8 for your vintage drive, and you have to swap the lower to get the right gear ratio. You could source a...
  20. Scott Danforth

    Busiest day of the year

    Yes
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