LV12 Revision Part 2

What is the purpose of an overdrive gear in a manual transmission?

• Provide better acceleration

• Reduce fuel consumption by lowering the engine rpm

• To increase torque

Answer explanation

Yes, at lower rpm the engine uses less fuel

A poorly set up or worn gear linkage will cause.....?

• Poor gear selection

• Incorrect gear selection

• Both answers

Answer explanation

Yeah, either won't go in gear or the wrong gear can be selected. There is a correct procedure for setting up the cables or rods in the workshop manual.

A spigot bearing would be located....

• in the flywheel

• in the gearbox

• in the clutch

Answer explanation

Yes, the spigot bearing would be located in the flywheel, as it is a component used in the clutch system to support the gearbox input shaft.

Which component converts the final drive through 90 degrees?

• Diff

• Gearbox

• Clutch

Answer explanation

The bevel gears do this on a RWD diff

Why do gearboxes use gears of a different size?

• To provide a ratio to increase speed

• To provide a ratio to increase torque to the road wheels

• Both answers

Answer explanation

Both answers are correct. High torque is needed when setting off and more speed for cruising

How are CV and UJ's lubricated?

• Oil

• WD-40

• Grease

Answer explanation

Yes - Grease will cling onto the ball bearings, but oil and WD40 are too thin, which could leak out at high speed or damage to the gaiters.

What should be done first when assessing a manual transmission complaint?

• Repair the gearbox

• Carry out a road test

• Check for fault codes

Answer explanation

Always! - you need to confirm the fault, even better if the customer is with you when road testing.

Insufficient free-play will cause which clutch fault?

• Poor gear selection

• Noisy gears

• Slipping clutch and overheated bearing

Answer explanation

Insufficient free-play can cause the clutch to slip, leading to overheating of the bearing. This fault is a result of inadequate clutch adjustment. (a small clearance is needed for thermal expansion)

A typical final drive ratio for a car would be?

• 1:1

• 1:2

• 4:1

Answer explanation

Yeah, as you can see by these 2 Fords, the ratio of the diff is usually between 3:1 and 4:1. Q - Which one of these cars is a RWD?

Which part of the clutch is connected to the gearbox input shaft?

• Centre plate splines

• Pressure plate

• Release bearing

Answer explanation

Yeah of course, but it must be centred otherwise............