Outboard Engines

Question 1

1. Explain the purpose of the ‘power head’.

Answer 1

The power head provides the power via the driveshaft to the propeller.

Question 2

2. Explain the purpose of the ‘ gearbox’.

Answer 2

The gearbox houses the gearing which puts the drive in forward or reverse and converts the engine power speed to the appropriate propeller speed.

Question 3

3. List 4 features of the remote motor control lever.

Answer 3

The remote control has:
- a control handle,
- choke,
- ignition switch, and
- emergency stop switch.

Question 4

4. Compile a list of items you would check as part of your pre- start inspection.

Answer 4

• check fuel & required oil
• ensure outboard securely fixed to vessel
• throttle & gear lever in neutral position
• emergency stop & lanyard attached
• all connections in good order
• all safety equipment carried

Question 5

5. Explain how an outboard engine is attached to the vessel using the clamp screw and safety chain.

Answer 5

The 2 clamps fix the outboard to the boats transom with the safety chain also attached.

Question 6

6. Explain the position of the gear lever prior to starting and why this is necessary.

Answer 6

The gear lever must be in neutral to avoid possible injury from the propeller or damage to property from sudden movement of the boat.

Question 7

7. Explain the purpose of an ‘Emergency Engine and Stop Clip’ and how it works.

Answer 7

The emergency stop clip is attached to the operator and the ignition. It enables the quick stopping of the engine if the operator falls overboard or moves away from the controls.

Question 8

8. List 6 things you would check if an engine failed to start.

Answer 8

1. Emergency stop clip attached
2. Fuel bulb is primed.
3. Fuel tank breather is open.
4. Gear selection is in neutral.
5. Starter battery is in good condition.
6. Throttle & choke are in correct positions.
7. Fuel tank is full.

Question 9

9. Explain why it is necessary to conduct a warm up period after starting the engine.

Answer 9

To prevent cold seizure & premature engine wear. The engine should be brought brought to operating temperature quickly and allow proper oil lubrication.

Question 10

10. What is the most common causes of overheating in an outboard engine?

Answer 10

An obstruction in cooling water intakes or water pump failure.