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  1. Scott Danforth

    mercruiser 4.3 turns off after 10 minutes

    Check for fuel and spark next time it happens Follow the Thunderbolt trouble shooting guide If your ignition trigger is the original 2-wire version. I would look there. They updated to a 3-wire version almost 20 years ago
  2. Scott Danforth

    Merc 5.7 Keeps Shearing starter bolts

    Then you have multiple problems Find why it's hydrolocked
  3. Scott Danforth

    87 PCM Chevy inboard temp / water pump issue

    No no Circulation pump is a brass impeller version of an automotive water pump. These are GM or Mehling and cost about $80 for an SBC. These almost NEVER go bad Raw water pump has a rubber impeller and is what pushes water from the pickup to the thermostat housing. These are available...
  4. Scott Danforth

    87 PCM Chevy inboard temp / water pump issue

    Not sure where you are looking, however getting the pump direct from Jabsco/Johnson/Shorewood would not be anywhere near $1000
  5. Scott Danforth

    87 PCM Chevy inboard temp / water pump issue

    Find the missing pieces Raw water pump and circulation pump are two different things
  6. Scott Danforth

    Transom savers

    The fishing barge that Dad and I trailered everywhere just used a bungee from trailer to lower unit to keep the 12 hp motor from flopping
  7. Scott Danforth

    Need HP Capacity Help

    If you went up to 70hp, you would make more noise and burn more fuel, however not go any faster
  8. Scott Danforth

    No spark, 91 536

    Service the points File them Rough gap them Set dwell with a meter Set timing
  9. Scott Danforth

    Mercruiser 3.0 electrical problem?

    Your alternator may not be charging Your battery could be toast Get alternator tested get battery tested
  10. Scott Danforth

    87 PCM Chevy inboard temp / water pump issue

    Replace your raw water impeller or the whole pump It's not your thermostat Make sure you find all the pieces of your old impeller
  11. Scott Danforth

    End of Season Maintenance

    I wouldn't Engine oils develope acids from the combustion process You could have a gear box seal leak Your bellows could be leaking There is a reason that the maintenance cycles are 100 hours or annually
  12. Scott Danforth

    Plastic under gas tank

    My guess it's left over from them making the boat because the line worker was too lazy to dispose of it. Have found coke cans, bags, etc when uncapping boats
  13. Scott Danforth

    Chaparral Engine Compartment Insulation

    One of the marine engine bay insulation companies is soundown.com
  14. Scott Danforth

    Crankshaft sound?

    Kind of. It's under the motor at the forward side of the flywheel. Most likely easiest by pulling the motor
  15. Scott Danforth

    WOT for 20min and engine bogs.

    First thought is check for fuel and spark If you don't have fuel spraying when you give the throttle, it's the fuel system and most likely a plugged vent If you have fuel, but not spark. Go thru the Thunderbolt trouble shooting guide. Most likely the ignition trigger assembly if it's the old...
  16. Scott Danforth

    Guys, help with a weird fishbox on my new (to me) Robalo

    My guess there could be a check-valve installed backwards Coffin boxes used as an ice chest have a drain line that allows waste water out Floor boxes are generally storage with the same type of in-line scupper check
  17. Scott Danforth

    Oil Pressure Switch Necessary with the Sniper EFI?

    All electric fuel pumps in a marine environment need to have an alternate switch that shuts down the pump. One is the primary ignition, the second is either from an oil pressure switch, alternator output, or ECM command You want to make sure the pump is not running unless the motor is running...
  18. Scott Danforth

    5.7L MerCruiser Bravo III under water...repairable?

    First, welcome aboard Motor is junk, wiring is junk, blowers junk, steering cable is junk, control cables are junk, drive would need to be pulled apart. Water has now gotten into areas that it will never get out of Leak being transom, assume transom/stringers/deck are rotten Estimate $5000...
  19. Scott Danforth

    Exterior vs interior plywood

    Because the $2cost savings per sheet isn't worth it Because interior grade wood is has less plys
  20. Scott Danforth

    Suggestions about boat not getting on plane and prop protection

    They help the manufacturer make money and they help empty your wallet
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