Troubleshooting the Boat Engine

Aboard a small powerboat, the most likely problems you’ll encounter will involve the engine. While it seems foolish, your first checkpoint should be the fuel tank to make sure that you actually have fuel. Don’t rely on the gas gauge. It may be wrong. Tap the tank or rock the boat to see if you hear fuel sloshing in the tank. If you do have sufficient fuel, try some of the other steps suggested below.

Problem: Starter boat motor works but engine won’t start  
Boat Engine not getting fuel Check boat fuel supply

Make sure boat fuel valve and fuel tank vent are open

Check boat fuel line for leaks

Remove and clean boat fuel filter

 
Boat Engine flooded Let boat engine sit for 20 minutes with ignition off

Crank boat engine with throttle fully open (and choke open, if manual)

Try normal boat starting procedures

Equipment Outfitters
Boat Engine overheats Allow boat engine to cool

Check cooling boat water intake and remove any obstructions

Tighten boat water pump belt on inboards and check impeller

Check cooling boat water hoses for leaks

Check boat oil and refill as needed

Check fresh water cooling boat tank on inboards and refill

 
Lack of spark Remove wire from one plug, hold it carefully 1/4 inch from boat engine block, crank engine once. If there is no spark or a pale yellow spark, open the distributor cap and check for corrosion or moisture. A solid blue spark means the boat ignition is working; test each plug separately.  
Fouled spark plugs Examine the boat plugs for carbon or debris and clear the tips

Replace plugs if engine still does not start

 
  Problem: Starter does not operate  
  Low battery Turn off all boat lights and allow 30 minutes for battery to recover

Clean boat battery posts and connections

Check boat battery cells and fill with fresh water

Tighten alternator belt on inboards

 
  Problem: Engine stops suddenly
  With noise Possible damage: broken piston, valve, timing chain
  Without noise The problem is likely electrical. Inspect wiring and test for spark.
  With sputtering and coughing The problem is likely boat fuel. Check for fuel reaching carburetor.

Changing the Boat Propeller

Even the most alert powerboat skipper may occasionally ding the propeller on a floating object or in shallow water. The result may be a small boatnick in the blade (which can be filed down) or it may bend the entire blade, in which case a spare boatpropeller should be installed. On outboards and sterndrives, this is a simple matter once the drive unit is tilted upwards so that the propeller is accessible above water.

Before starting, lock the tilt mechanism and turn off the ignition so that the drive unit cannot be lowered accidentally.

With pliers, bend the ends of the cotter pin straight and pull it from the hub. Unscrew the hub, being careful to save the thrust washer behind the hub. Remove the damaged propeller, replace the boatsheer pin where appropriate and insert the new propeller. Replace the thrust washer, screw on the hub snugly and align the hub and shaft holes. Replace the boatcotter pin and bend back the ends.

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Troubleshooting the Boat Engine

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