Engine Mechanical Repair Day 2

What is the cause of the bearing wear that is shown?

• Oil Starvation

• Incorrect bearing cap installation

• Contamination

• Normal bearing wear

What should be done when coolant hoses are contaminated with engine oil?

• They should be removed and cleaned by hand.

• They should be replaced.

• They should be cleaned with two cooling system flushes.

• Nothing. They are designed to handle all fluids.

What is the cause of the bearing wear that is shown?

• Oil starvation

• Overheating

• Incorrect fuel

• Fuel quality

How can you measure cam lobe lift on an engine that uses a ladder frame design?

• It's not possible.

• Plastigage

• Using a vernier caliper, measure the lobe's "base circle" and multiply by 3.145

• Using a micrometer, measure the lobe from nose to heel and subtract its "base circle" measurement

Pre-ignition is when the spark plug fires too early.

• True

• False

If ignition occurs too early, engine knock occurs.

• False

• True

What is most likely to cause low running compression test readings on all cylinders?

• Bent rod journals

• Burned exhaust valves

• Worn cam lobes

• Incorrect cam timing

What is most likely to cause high running compression test readings on all cylinders?

• Incorrect cam timing

• Worn cam lobes

• Cracked piston skirts

• Running compression tests should be higher than normal compression tests

The repair manual says to create a pressure of 3.0 bar on the 1274B. What is the purpose?

• To have enough pressure in the cooling system for leak diagnosis

• To test the 1274B for leaks within itself

• The 1274B has to "warm up"

• To test the integrity of the 1274B's connection to the vehicle

What is the measurement shown?

• 9.21mm

• 10.21mm

• 9.71mm

• 10.71mm