ABYC Diesel Certification questions with verified
answers
a customer complains of white smoke only when the engine is cold. Technician a
says this could be caused by a faulty preheat device. Technician b says the white
smoke is caused by partially vaporized fuel. Who is right Ans✓✓✓-Both techs
A customer complains the engine idle is rough. Tech a says air in the fuel system
may be the cause. Tech b says the fuel shut off solenoid is not operating. Who is
right Ans✓✓✓-Tech a
A fully charged battery at rest will show a minimum of how many volts Ans✓✓✓-
12.6 volts
A ruptured oil cooler core may result in Ans✓✓✓-Water in the oil system or oil in
the water system
A turbocharger oil seal failure can cause Ans✓✓✓-Engine to run away
ABYC states that a failure occurs with the shaft seal while operating at low speeds
no more than how many gallons per minute can enter Ans✓✓✓-2 gallons
According to abyc standards diesel fuel system distribution and return lines must
Ans✓✓✓-Be u s coast guard type A
Add high-speed the raw water pressure shows heavy fluctuation as indicated on a
pressure gauge. A possible cause would be Ans✓✓✓-Debris in the sea water pick
up
, All times injection pumps are time to Ans✓✓✓-As per engine service manual
an engine equipped with an exhaust mixing elbow is installed below the waterline
what device must be installed in the raw water discharge hose ahead of the
mixing elbow Ans✓✓✓-Siphon break
And heat exchangers what direction do coolant vs. Water flow Ans✓✓✓-
Opposite of each other
At what pressure does gasoline engines versus diesel engines compress
Ans✓✓✓-Gas 180 PSI vs diesel 380psi
At what temperature to diesel engines ignite atomized diesel fuel Ans✓✓✓-750
degrees Fahrenheit or 400 degrees c and above
Auxiliary heating devices such as cabin heaters and water heaters may require
Ans✓✓✓-Using a restrictor fitting and installing the device lower than the
expansion tank
Based on a b y c standard the range of clearance between a Cutlass bearing and a
shaft that is 1 and 1/2 in in diameter would be Ans✓✓✓-.004 to .009 in
Battery switches are required for any battery when Ans✓✓✓-Over 800 CCA
Battery switches are required for any battery when Ans✓✓✓-Over 800cca
answers
a customer complains of white smoke only when the engine is cold. Technician a
says this could be caused by a faulty preheat device. Technician b says the white
smoke is caused by partially vaporized fuel. Who is right Ans✓✓✓-Both techs
A customer complains the engine idle is rough. Tech a says air in the fuel system
may be the cause. Tech b says the fuel shut off solenoid is not operating. Who is
right Ans✓✓✓-Tech a
A fully charged battery at rest will show a minimum of how many volts Ans✓✓✓-
12.6 volts
A ruptured oil cooler core may result in Ans✓✓✓-Water in the oil system or oil in
the water system
A turbocharger oil seal failure can cause Ans✓✓✓-Engine to run away
ABYC states that a failure occurs with the shaft seal while operating at low speeds
no more than how many gallons per minute can enter Ans✓✓✓-2 gallons
According to abyc standards diesel fuel system distribution and return lines must
Ans✓✓✓-Be u s coast guard type A
Add high-speed the raw water pressure shows heavy fluctuation as indicated on a
pressure gauge. A possible cause would be Ans✓✓✓-Debris in the sea water pick
up
, All times injection pumps are time to Ans✓✓✓-As per engine service manual
an engine equipped with an exhaust mixing elbow is installed below the waterline
what device must be installed in the raw water discharge hose ahead of the
mixing elbow Ans✓✓✓-Siphon break
And heat exchangers what direction do coolant vs. Water flow Ans✓✓✓-
Opposite of each other
At what pressure does gasoline engines versus diesel engines compress
Ans✓✓✓-Gas 180 PSI vs diesel 380psi
At what temperature to diesel engines ignite atomized diesel fuel Ans✓✓✓-750
degrees Fahrenheit or 400 degrees c and above
Auxiliary heating devices such as cabin heaters and water heaters may require
Ans✓✓✓-Using a restrictor fitting and installing the device lower than the
expansion tank
Based on a b y c standard the range of clearance between a Cutlass bearing and a
shaft that is 1 and 1/2 in in diameter would be Ans✓✓✓-.004 to .009 in
Battery switches are required for any battery when Ans✓✓✓-Over 800 CCA
Battery switches are required for any battery when Ans✓✓✓-Over 800cca
