WorksheetsEngine Mechanical Repair Day 2
Total questions: 10
Worksheet time: 5mins
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
