[GM-71 Engine Tune Up]

Question 1

1) What size feeler gauge should be used when adjusting the governor gap?
2) How far should the buffer screw be backed out?
3) What position should the speed control lever be set?

Answer 1

1) .006”
2) 5/8” from the locknut
3) MAXIMUM speed

Question 2

What is the max amount of pressure that can be used when blow drying an injector with compressed air?

Answer 2

40 psi

Question 3

1) How much should the screw be tightened when positioning the injector rack control levers?
2) What positions should the speed control lever and stop lever be set?

Answer 3

1) 1/8 of a turn more

2) MAXIMUM speed and RUN

Question 4

What is a loss of engine lubricating oil through the breather tube, crankcase ventilator or dipstick hole in the cylinder block indicative of?

Answer 4

Excessive crankcase pressure

Question 5

What should always be used to avoid fuel leakage when replacing the fuel pipes on an engine?

Answer 5

New O-rings

Question 6

What is lack of power or black or grey exhaust smoke indicative of?

Answer 6

Low air box pressure

Question 7

What are two indications of fuel leakage at the fittings of the fuel injector supply lines and connector nut seals?

Answer 7

• Low lubricating oil pressure

* Fuel odor coming from the crankcase breathers or an open filler cap

Question 8

1) What is the recommended idle speed?
2) How many RPMs should the idle be set below the recommended idle speed?
3) What positions should the speed control lever and stop lever be set?

Answer 8

1) 500 RPM
2) 15 RPM
3) IDLE and RUN positions

Question 9

What is a lightweight, compact unit which enables quick, easy starting directly on diesel fuel and permits the use of a simple open type combustion chamber?

Answer 9

Fuel injector

Question 10

What must the variation in compression pressures between cylinders not exceed?

Answer 10

25 psi at 600 RPM

Question 11

1) What size feeler gauge should be used when performing a valve clearance adjustment?
2) What positions should the speed control lever and stop lever be set?

Answer 11

1) .016”

2) IDLE and STOP positions

Question 12

How is heat removed from the coolant?

Answer 12

• Radiator

* Heat exchanger

Question 13

1) What size timing gauge should be used when timing a fuel injector?
2) What positions should the speed control lever and stop lever be set?

Answer 13

1) 1.460”

2) IDLE and STOP positions

Question 14

What regulate the flow of the coolant within the cooling system?

Answer 14

Thermostats