Automotive - Servicing

Question 1

How is tappet clearance adjusted on a cylindeer head with adjustable tappets?

Answer 1

By hydraulic lifters which are self-adjusting

Question 2

What is top dead centre (TDC)?

Answer 2

When the piston is at the top of the stroke, closest to the cylinder head.

Question 3

How is end float of a cranckshaft controlled?

Answer 3

By thrust bearings, which are fitted to one of the main bearing journals

Question 4

How many degrees of crankshaft rotation is a four stroke?

Answer 4

A fourstroke cycle is 720 degrees, or 2 complete turns of crankshaft rotation

Question 5

How many power strokes occur in one complete rotation?

Answer 5

3 power strokes

Question 6

How is a 2 stroke engine lubricated?

Answer 6

With oil and fuel

Question 7

What is the meaning of stoichiometric ratio?

Answer 7

The precise air/fuel ratio by weight, when all the petrol will burn resulting in complete combustion

Question 8

How are the valves closed?

Answer 8

By the valve spring