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  1. Scott Danforth

    closed cooling

    if the heat exchanger is properly designed, it can work with the lower flow of the Alpha raw water pump. going full system, the heat exchanger will be at least 5" in diameter with a core at least 21" long for a low output 5.7 liter a full system has twice the BTU capacity as a half system are...
  2. Scott Danforth

    1998 Mercruiser 5.7 TBI Backfiring Under Load & Loss of Power

    impellers are NOT self priming. so when you fire up the boat, the whole outdrive must be under water to have the raw water pump flooded. this is why you must use a hose and muffs with enough water pressure and flow to operate the motor when on a trailer. 4000 RPM is way too low. the knocking...
  3. Scott Danforth

    1996 Four Winns 5.8 Duo drive Fuel pump location

    You need a marine intake for corrosion issues, even in fresh water You need a marine carb and marine distributor so you don't blow up and meet Jesus We will agree to disagree on carb size for a boat. And you can't use any of the carbs from your pile of carbs as none of them are marine
  4. Scott Danforth

    Shot in the Dark Depth Transducer Compatibility

    fish finders use different transducers than the depth gauge.
  5. Scott Danforth

    Mercruiser 3.0 1988

    since your motor is older than 15 years old, you may have to call your local merc dealer for the manual. the website only goes back a few years
  6. Scott Danforth

    1996 Four Winns 5.8 Duo drive Fuel pump location

    have you check your IAC to see if its stuck. that will cause the motor to not idle correctly if you are going to carb...... you have to run a marine intake with brass water passages. not a standard aluminum intake unless your motor is heat exchanged cooled. Carter universal marine fuel...
  7. Scott Danforth

    Volvo Penta F4 vs F5

    what do you have on the boat now? what boat, what size, what weight, what motor, what drive ratio volvo does not list pitches on their duo-prop drives, they list series with a number. the lower the number, the lower the pitch. the higher the number the higher the pitch. so stick with the...
  8. Scott Danforth

    Chasing Down Fuel Delivery Issue

    the yellow tint and the crud are both concerning the crud may have been pumped in when you filled up.
  9. Scott Danforth

    71 silverline comoro

    Pull the drive and use a hose
  10. Scott Danforth

    Mercruiser 2.5 ticking sound

    you know that flat tappet cam lobes and lifter should not be mixed and matched (they mate for life)
  11. Scott Danforth

    1980 Avenger weight and hp rating

    a good transom will not move on the trailer. the whole boat may move with respect to the trailer, however the transom should not move with respect to the boat a properly foamed floor will not flex with 500# walking on it. there should be no visible movement or flex at all on the transom, and...
  12. Scott Danforth

    Unusual Bilge pump power issue

    the fuse box if it exists is normally only the + VDC side of the system. many boat manufacturers use a ground buss, some like AD mentions - a brass plate with ring terminals screwed to it. some use a combo buss bar some use a cheap stamped buss bar with 1/4 spade connectors. all of them can...
  13. Scott Danforth

    350 Magnum Tournament Ski spark plugs

    with 3 bad cylinders on the same bank, the exhaust manifold has been leaking and the exhaust ports are rusted. at a minimum, pull the exhaust and look. maybe time to pull the motor, get it on the stand and do a tear down.
  14. Scott Danforth

    1980 Avenger weight and hp rating

    first, welcome aboard. second, the band-aid plate on the transom is because the transom is most likely rotten. also check the floor and the hull core. these boats were known to rot. Third. read this...
  15. Scott Danforth

    Trim up doesn’t work when on plane

    hydraulic cylinder seals last 15-20 years before they start leaking. your boat is 30 years old. the piston seals are most likely bypassing, hence the reason it wont hold load. the rod seal and wiper or the gland seal is most likely leaking, causing the milky fluid
  16. Scott Danforth

    Trim up doesn’t work when on plane

    Most likely the cylinder seals need to be replaced
  17. Scott Danforth

    Unusual Bilge pump power issue

    Check the ground buss
  18. Scott Danforth

    Stripped threads on carburetor

    You will never get an NPT fitting to seal. I wouldn't chance a hokey repair. In a car, if you have a fuel leak, you just loose fuel. Possible chance of fire. In a boat, a fuel leak means you meet Jesus in a million burning pieces
  19. Scott Danforth

    Mercruiser 2.5 ticking sound

    There should be no axial or radial movement of the distributor shaft within the housing
  20. Scott Danforth

    Flushing out cooling system after sucking in mud

    Bravo pump and your 6.2 need more flow than your 5/8" hose can provide
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