Diesel Engine Speed, Fuel, Controls, and Protection

Question 1

The Control of a Diesel Engine is accomplished through what components?

Answer 1

Camshaft
Fuel Injector
Governor

Question 1

It provides the timing needed to properly inject the fuel

Answer 1

Camshaft

Question 2

It provides the component that meters and injects the fuel

Answer 2

Fuel Injector

Question 3

It regulates the amount of fuel that the injector is to inject

Answer 3

Governor

Question 4

Together, these _______________ ensure that the engine runs at the desired speed

Answer 4

Three major components

Question 5

Each cylinder has a fuel injector designed to meter and inject fuel into the cylinder at the proper instant. To accomplish this function, the injectors are _______?

Answer 5

Actuated by the engine’s camshaft

Question 6

The amount of fuel to be injected by each injector is set by a mechanical linkage called the?

Answer 6

Fuel Rack

Question 7

The fuel rack position is controlled by the engine’s _______?

Answer 7

Governor

Question 8

The governor provides the engine with the _____ _____ to change speed as needed and to maintain a speed once reached.

Answer 8

Feedback Mechanism

Question 9

A governor is essentially a _________, designed to maintain a constant engine speed regardless of _______.

Answer 9

Speed-sensitive device
Load Variations

Question 10

Governors may be classified as?

Answer 10

Speed regulating Governors

Question 11

In an engine that is required to come up and run at only a single speed regardless of load, the governor is called a?

Answer 11

Constant-speed type governor

Question 12

If the engine is manually controlled or controlled by an outside device with engine speed being controlled over a range, the governor is called?

Answer 12

Variable-speed type governor

Question 13

If the engine is designed to keep the engine speed above a minimum and below a maximum, then the governor is a?

Answer 13

Speed limiting type

Question 14

This type of governor limits fuel to ensure that the engine is not loaded above a specified limit

Answer 14

Load-limiting type

Question 15

Common starting circuit of a diesel engine

Answer 15

Air motors, electric motors, hydraulic motors, and manual

Question 16

The start circuit can be a?

Answer 16

Manual start pushbutton or a complex auto-start circuit

Question 17

The following events must occur for the starting engine to start.

Answer 17

1. The start signal is sent to the starting motor
2. The starting motor will crank the engine
3. The engine will then accelerate to idle speed.

Question 18

It is located in the cylinder head of the combustion chamber and uses electricity to heat up the electrode. The heat added by it helps ignite the fuel in a cold engine

Answer 18

Glow plug

Question 19

Large engines usually heat the block or have a?

Answer 19

Powerful starting motor

Question 20

Some large engines use _________ that inject compressed air into the cylinders which rotates the engine during the start sequence.

Answer 20

Air start manifolds

Question 21

It is a type of mechanical flyweight that will act to cut off fuel to the engine and alarm at a certain rpm.

Answer 21

Overspeed device (alarm/trip)

Question 22

It provides early warning of abnormal engine temperature, usually an alarm function only.

Answer 22

High water jacket temperature (alarm)

Question 23

It indicates an overloading of the engine or possible poor performance due to inadequate scavenging (cooling effect) in the engine

Answer 23

High exhaust temperature (alarm)

Question 24

It provides setpoints to indicate low pressure in an engine. One setpoint provides early warning of abnormal oil pressure, an alarm function only. The second setpoint can be set to shut down the engine before permanent damage is done.

Answer 24

Low lube oil pressure (alarm/trip)

Question 25

It is usually caused by excessive blow-by (gas pressure in the cylinder blowing by the piston rings and into the crankcase). The high-pressure condition indicates the engine is in poor condition.

Answer 25

High crankcase pressure (alarm)