Home Surf Survival / Tech Docs Doctor's Corner Repair: Dewatering Sunk Engine
Repair: Dewatering Sunk Engine
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Saturday, 01 December 2007 19:19

Purpose: The purpose of this article is to lay out the proper procedure for repairing a sunk ski. It is very important to get your motor running asap (within a couple hours) of it getting sunk especially in salt conditions.

Recommended for: Everyone. I don't care how much or little you know about wrenching, you often must take this matter into your own hands as though your $1000+ motor depends on it!

Process:
  1. Drain out or roll Ski over (exhaust side down) to empty engine compartment of as much water as possible.
  2. Remove spark plugs, tuck spark plug wires out of the way.
  3. Roll ski as far over as possible exhaust side down - usually carbs up. This step will save some of the life of your starter.
  4. Turn/crank over till no water(helps to lightly place finger on 1 hole at a time to increase pressure).
  5. Roll back down flat.
  6. Turn/crank over a few seconds.
  7. Repeat steps 3 - 6 at least 3 times! This will remove most water from the cases.
  8. Put plugs in 3/4 way down and try to start. It will pop.
  9. Remove and dry plugs and try again. It helps to add ether, starting fluid, carb cleaner, fogging oil, or lube at this point. Prime as necessary.
  10. Repeat steps 8-9 at least 2-3 times.
  11. If pops but does not run, start over at step 1.
  12. You can usually recover a motor in 5 minutes. Then run in the water or on a hose for at least 20 minutes to clear out the motor.
Tip: Hot spark plugs, when they get hit with cold water may fail. It may help to replace the plugs prior, during or after water recovery. Running a hotter spark plug is rumored to help. For example, if you typically run B8HS or BR8ES plugs, some folks recommend recovering your motor with B7HS or BR7ES plugs. 8's have always worked fine for me....

Important: Do not quit until the engine is successfully restarted.

The following video has a great demonstration of recovering a sunk motor about halfway through:

 
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