Heavy Duty Technician – Engine Systems Notes (Level 2 Study Guide 2026)
CNG is stored at what PSI - ✔✔3000-4500psi
Oil accumulating in the exhaust piping or manifold of a diesel engine can be caused by _____. -
✔✔Worn Valve Guides
O-rings prevent liners - ✔✔leaking coolant into the oil pan
Nicolas Otto Developed - ✔✔the 4 stroke diesel engine in 1861
companion cylinders - ✔✔two cylinders whose pistons come to TDC and BDC at the same time
diesel or gas has higher compression rations - ✔✔diesel
bore - ✔✔diameter of a cylinder
stroke - ✔✔total linear distance traveled
Compression Ratio - ✔✔CR = volume displacement + volume clearance
Divided by volume clearance
Cetane Rating - ✔✔the ease at what fuel will ignite
specific gravity - ✔✔Allows diesel fuel to deliver more heat per gallon (less water more heat)
, which fuel produces the most heat (btu) - ✔✔diesel
firing order inline 6 - ✔✔1-5-3-6-2-4
Trucks siting overnight after a service and won't start in the morning what may be the issue ? -
✔✔low pressure suction filter/ loose primary filter or fitting on suction side
Best time to fuel up your truck/machine - ✔✔At the end of each shift
Restricted fuel filter can cause - ✔✔Low Fuel Pressure
what's a problem when tanks are left empty all night - ✔✔moisture condenses and
contaminates fuel
inline blocks are numbered from - ✔✔front to fly wheel
Most engine blocks are made from - ✔✔Cast iron
the engine block is - ✔✔rigid foundation for major engine components
why should frost plugs be removed - ✔✔for thorough cleaning of coolant passages
how to check block warpage - ✔✔strait edge and thickness gauge
what happens when you the block deck surface - ✔✔decreases the distance between the deck
and crank shaft centre line
CNG is stored at what PSI - ✔✔3000-4500psi
Oil accumulating in the exhaust piping or manifold of a diesel engine can be caused by _____. -
✔✔Worn Valve Guides
O-rings prevent liners - ✔✔leaking coolant into the oil pan
Nicolas Otto Developed - ✔✔the 4 stroke diesel engine in 1861
companion cylinders - ✔✔two cylinders whose pistons come to TDC and BDC at the same time
diesel or gas has higher compression rations - ✔✔diesel
bore - ✔✔diameter of a cylinder
stroke - ✔✔total linear distance traveled
Compression Ratio - ✔✔CR = volume displacement + volume clearance
Divided by volume clearance
Cetane Rating - ✔✔the ease at what fuel will ignite
specific gravity - ✔✔Allows diesel fuel to deliver more heat per gallon (less water more heat)
, which fuel produces the most heat (btu) - ✔✔diesel
firing order inline 6 - ✔✔1-5-3-6-2-4
Trucks siting overnight after a service and won't start in the morning what may be the issue ? -
✔✔low pressure suction filter/ loose primary filter or fitting on suction side
Best time to fuel up your truck/machine - ✔✔At the end of each shift
Restricted fuel filter can cause - ✔✔Low Fuel Pressure
what's a problem when tanks are left empty all night - ✔✔moisture condenses and
contaminates fuel
inline blocks are numbered from - ✔✔front to fly wheel
Most engine blocks are made from - ✔✔Cast iron
the engine block is - ✔✔rigid foundation for major engine components
why should frost plugs be removed - ✔✔for thorough cleaning of coolant passages
how to check block warpage - ✔✔strait edge and thickness gauge
what happens when you the block deck surface - ✔✔decreases the distance between the deck
and crank shaft centre line
