Which of the following conditions will cause a bent connecting rod?
Hydrostatic lock
What is the cause of white exhaust smoke on an engine at operating temperature ?
Leaking injector tubes.
What will cause blue exhaust smoke?
Worn valve guides
What will cause a sudden drop in oil pressure?
Reg valve stuck open
What is the cause of excessive engine oil temperature?
Low oil level
What would cause an engine to operate at an excessively high temperature?
Slipping water pump belt.
What will cause seized turbocharger bearings?
Thermostat is stuck closed.
What will cause seized turbocharger bearings?
Insufficient cool down time.
What will cause high fuel inlet restriction?
Plugged fuel tank vent.
Which of the following conditions will cause rough running and low engine power output?
Air in the fuel system.
On a HEUI fuel system, which of the following will cause a hard or no start condition?
Slow crank speed
What will cause an electronically controlled engine to start and run but not accelerate?
Throttle position sendor open circuit
What will cause the rail pressure limiting valve to open on a ‘Common Rail’ fuel system?
A faulty rail pressure control valve
What will a plugged diesel particulate filter (DPF) cause?
Excessive exhaust system backpressure.
What must be done when installing piston rings?
Stagger ring gaps
What should be done when using plastigage to measure main bearing clearance?
Install plastigauge, torque bearing cap, remove bearing cap, read clearance.
What is done when testing engine oil pressure?
Install gauge main oil gallery, run engine to specific rpm.
What procedure must be followed when the coolant has been contaminated with engine oil?
Flush system thoroughly and replace antifreeze
When installing a new or rebuilt turbocharger what is done?
Inspect air filter and pre-lubricate turbo with clean engine oil.
What should be done after performing fuel filter service?
Bleed the fuel system.
What steps must be followed to repair an active fault code?
Locate and repair fault, test system for proper operation
What is the correct procedure when performing circuit checks on computer controlled engine?
Test voltage and resistance using high impediance digital meter
What is an important step when preparing a DPF for cleaning?
Mark direction of floe through core
Which procedure will prevent the SCR system from freezing up at low ambient temperatures?
Repair temp sensing circuit in DEF
