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  1. Scott Danforth

    87 PCM Chevy inboard temp / water pump issue

    You must use a fake-lake on a hose with an inboard Or a fresh-water flush fitting You need to replace the impeller you toasted There is no pump in the boat that can draw water. They all only push water When the boat is in the water, the level of the pump is 8" or more below the surface of...
  2. Scott Danforth

    87 PCM Chevy inboard temp / water pump issue

    Only a positive displacement ball & check pump or a piston and check pump can lift water
  3. Scott Danforth

    87 PCM Chevy inboard temp / water pump issue

    The bucket would need to be 8" above the impeller and have a bottom fitting to be able to flood it to prime Again, raw water pump can not suck/draw water any distance You toasted your impeller Your circulation pump could be completely removed and the raw water pump would still pump assuming...
  4. Scott Danforth

    87 PCM Chevy inboard temp / water pump issue

    Raw water pumps do not "suck". They only push. They are a flooded inlet rubber vane pump Unless your bucket is big enough to put the whole boat in it, you toasted your new impeller Always use muffs or fake-lake if on land Your circulation pump circulllates water within the block and heads
  5. Scott Danforth

    87 PCM Chevy inboard temp / water pump issue

    Doubt you will need it. Only issue would be if the bearings and seals went bad
  6. 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
  7. Scott Danforth

    Merc 5.7 Keeps Shearing starter bolts

    Then you have multiple problems Find why it's hydrolocked
  8. 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...
  9. 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
  10. Scott Danforth

    87 PCM Chevy inboard temp / water pump issue

    Find the missing pieces Raw water pump and circulation pump are two different things
  11. 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
  12. 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
  13. Scott Danforth

    No spark, 91 536

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

    Mercruiser 3.0 electrical problem?

    Your alternator may not be charging Your battery could be toast Get alternator tested get battery tested
  15. 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
  16. 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
  17. 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
  18. Scott Danforth

    Chaparral Engine Compartment Insulation

    One of the marine engine bay insulation companies is soundown.com
  19. 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
  20. 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...
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