Unit 161 Overhauling light veh eng mech units

An engine has been diagnosed with a blown head gasket. When overhauling the head it is important to check for:

• Ovality of the cylinder

• Cylinder head distortion

• Crankshaft end float

• Flywheel run out

After carrying out an engine overhaul what checks are carried out to evaluate the performance of an engine?

• Check cooling system for leaks

• Check the exhaust emissions

• Road test the vehicle

• All of the above

What could a dial test indicator be used for?

• Measuring cylinder compression pressure

• Measuring firing voltage of a plug

• Measuring cylinder balance

• Measuring run-out of a flywheel

If the replacement cost of an engine is more than the repair cost it is said to be:

• A cost effective repair

• A very costly repair

• A very cheap repair

• An uneconomic repair

The size of a shaft is stated as 40mm +/- 0.05mm. The lower limit of the shaft is

• 40.05mm

• 0.05mm

• 39.95mm

• 40mm

Following a repair to a customer’s vehicle you should always:

• Carry out a dynamometer test and print out the results

• Carry out a road worthiness inspection and produce a report

• Clean off grease marks from the vehicle's interior and exterior

• Check the vehicle has got a valid MOT and road tax

The tolerance of a shaft in the technical data information is stated as 29.95mm to 30.05mm. If the nominal diameter is 30mm, what is the tolerance of the shaft?

• 0.05mm

• 30.00 mm

• +/- 0.1mm

• +/- 0.05mm

Which of the following tests is NOT suitable to evaluate the mechanical condition of the engine?

• Power balance test

• EGR operation test

• Cylinder leakage test

• Compression test

What is the meaning of the term ‘interference fit’?

• Upper limit of the shaft is smaller than the lower limit of the hole

• The shaft is much smaller than the hole into which it fits

• The shaft is slightly larger than the hole into which it fits

• The shaft is slightly smaller than the hole into which it fits

Air bubbles appear in the engine coolant when carrying out a leakage test. This would indicate a:

• Worn cylinder bore

• Leaking water hose

• Defective radiator cap

• Blown head gasket