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WorksheetsEngine Mechanical Repair Day 1
Total questions: 15
Worksheet time: 8mins
What's the most likely cause of blue smoke from the tailpipe on startup?
Air pockets in coolant passages
Worn valve guides
Worn spark plugs
A mixture that's too lean
What's the most likely cause of blue smoke from the tailpipe on acceleration?
Incorrect fuel
Incorrect coolant
Worn exhaust seats
Worn piston rings
What is a compression test used for?
To determine if there are leaks in a
combustion chamber
To determine how much combustion pressure is generated
To determine exactly where a leak is in a cylinder
To initiate billable hours
If an engine's dry compression test is below its wear limit on all cylinders, which is a good following test?
Perform a power balance test
Perform a running compression test
Perform a wet compression test
Perform a "circular swap" of ignition coils
If you perform a compression test without disabling the fuel system, what could occur?
A "false positive" result
Incorrect pressures due to presence of raw fuel
Damage to the catalytic converter
Longer cranking time for a failed result is required
If there was an 18% increase in compression pressures going from a dry test to a wet test, then:
This indicates a piston ring problem
This indicates a valvetrain problem
This indicates a fuel delivery problem
This is normal
During a leak-down test you see bubbles in the coolant reservoir. What is the most likely cause?
Damaged piston ring
Damaged head gasket
Damaged exhaust valve
Damaged intake valve
What does the color of the coolant reservoir cap signify?
Audi is black, VW is blue
The country it was produced in
Its opening (venting) pressure
It's not significant
During a leak-down test you find 30% leakage on adjacent cylinders. What is the most likely cause?
Damaged piston ring
Damaged exhaust valve
Damaged intake valve
Cracked head
During a leak-down test you hear loud hissing from the tailpipe. What is the most likely cause?
Damaged exhaust valve
Damaged head gasket
Damaged piston ring
Damaged intake valve
What does it mean when a block tester's fluid changes from dark blue to yellow?
The block is sealed
There are combustion gasses present
The cylinder head is sealed
Yellow is not a possible result
What effect does increasing pressure have on the boiling point of a liquid?
The boiling point will decrease
The boiling point will be 100C
The boiling point will increase
The boiling point moves laterally
What are the oil passages in an engine block often referred to as?
Oil Galleries
Oil Paths
Oil Jets
Oil Jackets
What is a windage tray for?
It helps guide air over the oil pan for cooling
It causes airflow in the oil for cooling
It helps block airflow generated by the pistons and crankshaft.
It causes churning of oil to bring it up to temperature more quickly
What are the coolant passages in an engine block often referred to as?
Wasser cavities
Cenotes
Coolant ports
Water jackets
