During a PM inspection, an engine oil level reading taken five minutes after shutdown on a hot engine is BEST described as:
Engine Systems
Question · Easy
A serpentine belt shows multiple cracks across several ribs within a 1-inch span. The correct PM action is to:
Product that nearly all on-road compression-ignition trucks have used since 2010 in selective catalytic reduction systems to lower nitrogen oxides.
Guess the Term
Chapter 1: Engine Systems — Lubrication, Cooling & Mechanical Components
1.1 Engine Oil Level, Condition, Filtration & Leak Inspection
Study guide
Tech A says a soft, spongy coolant hose that springs back slowly indicates internal deterioration. Tech B says oil-soaked rubber hoses should be replaced even if not currently leaking. Who is correct?
Question · Hard
Read the clue and guess the term in 6 tries.
Game
During a charge-air cooler (CAC) inspection on a turbocharged diesel, the technician should primarily check for:
Aftertreatment device that physically traps exhaust matter until regeneration reduces it to ash, which periodic cleaning then removes.
A small green/orange crusty deposit at a radiator hose connection during PM most likely indicates:
The MOST appropriate PM method to verify engine coolant freeze/boil protection is to:
Engine drive component whose alignment and condition are checked with its tensioner and pulley.
1.2 Heavy-Duty Cooling Systems, Coolant Chemistry (SCA/ELC) & Pressure Testing
During PM, a clogged or heavily restricted air filter on a diesel engine will MOST directly cause:
Swap tiles to line up three of the same term.
Term Match
An air-filter restriction indicator that has latched at its maximum reading during PM means the technician should:
Cooling component whose clutch operation, bearing condition, and shroud are checked.
A wet, oily film on the lower engine and bell housing area during PM is BEST investigated by:
Question · Medium
During a diesel PM, fuel weeping at a steel injector supply line fitting should be:
Unit that synchronizes with the engine to automatically record driving time and hours of service.
Cab & Hood
1.3 Radiators, Charge-Air/Coolant Hoses, Belts, Pulleys & Fan Clutches
A diesel exhaust leak located UPSTREAM of the diesel particulate filter (DPF) during PM is a concern primarily because it:
Flip two cards at a time to find matching terms.
Term Pairs
During PM, the diesel exhaust fluid (DEF) level should be checked and the technician should also inspect for:
Rear-view device required in pairs, one at each side, mounted outside to show the highway behind and along both sides.
A loose or missing turbocharger oil drain (return) line clamp found during PM can lead to:
When checking power steering fluid during a heavy-truck PM, the technician should:
Windshield device with a blade and arm that fails periodic inspection on a power unit if inoperative or made ineffective by missing or damaged parts.
1.4 Engine Mounts, Vibration Dampers & Crankcase Ventilation
During PM, a coolant filter (supplemental coolant additive, SCA, filter) is replaced primarily to:
Find five hidden terms in a grid of letters.
Term Search
A diesel engine that smokes black under acceleration during the operational portion of PM most likely indicates:
Required lighting unit that must be operable at all times and must not be obscured by the load.
Electrical/Electronics
Tech A says engine mounts should be inspected during PM for cracking, separation, and oil contamination. Tech B says a collapsed engine mount can cause driveline angle and vibration problems. Who is correct?
During PM, a fan clutch that fails to engage when the engine is hot will MOST likely result in:
Feature that lights a warning telltale when a wheel is significantly under-inflated.
Frame & Chassis
Chapter 2: Engine Air Induction, Fuel Supply & Exhaust/Aftertreatment
2.1 Air Induction System, Filter Restriction & Charge-Air Cooler Inspection
A diesel engine oil sample that appears milky during PM most likely indicates:
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During PM the technician finds the engine air intake hump hose (boot) between the air filter and turbo has a small split. The correct action is to:
Safety feature required on truck tractors built on or after March 1, 1997, with an electrical circuit that signals a malfunction.
During a cab and hood PM inspection, a hood that is hard to latch and shows cracked hood mounts indicates:
Cab And Hood
A cab that has visible movement and a clunk over bumps, with a deteriorated cab air bag/mount, should be:
Groove pattern on any front-wheel tire of a bus, truck or truck tractor, which must be at least 4/32 inch deep at any point on a major groove.
2.2 Turbocharger Inspection, Oil Supply/Drain Lines & Boost Leaks
Per FMCSA out-of-service criteria, a heavy-truck windshield with a crack in the driver's critical viewing area is:
During PM, the windshield wipers smear and chatter and the blades show cracked, hardened rubber. The correct action is to:
System that must have service, parking and emergency forms and be adequate to stop and hold the vehicle.
A required exterior rearview mirror that is cracked so the image is distorted should be handled during PM by:
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