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2019-2022 Isuzu 4HK1

The following Maintenance Schedule lists all recommended

Services and Inspections based on Mileage, Months, and Engine Hours. PLEASE NOTE: In mid 2018 all Isuzu Trucks transitioned from using Isuzu Electronic Platforms, to GMC Electronic Platforms. Therefore, the use of Isuzu IDSS2 will not work, either GMC Software or alternative Scan Tool will be required, such as the SnapOn Pro-Link.

6M


20,000 MILES
  / 500 HOURS
    / 6 MONTHS

Replace the following:​

  • ENGINE OIL & FILTER

  • ENGINE FUEL FILTER & WATER SEPERATOR


 

Service the following:​​​

  • CHECK FOR ENGINE NOISE (Idle/Fast Idle)

  • CHECK AIR FILTER INDICATOR, REPLACE AS NEEDED

  • DRAIN THE FUEL WATER SEPERATOR AND INSPECT BOWL FOR DIRT/DEBRIS

  • INSPECT THE CAC (CLEAN AS NEEDED - IF OIL DISCOVERED)


 

24M


50,000 MILES
  / 2,000 HOURS
    / 24 MONTHS

Replace the following:​

  • ENGINE COOLANT


 

Service the following:​

  • ​OVERHEAD SET (VALVE ADJUSTMENT) 

  • ENGINE BOLT TORQUE CHECK (Fuel Injector Flange Bolts & Intake/Exhaust Manifold Bolts)

  • CHECK FOR EXCESSIVE OIL COMING FROM THE CRANKCASE BREATHER INTO ENGINE INTAKE, REPLACE CRANKCASE BREATHER AS NEEDED, AND CLEAN ALL OIL FROM INTAKE, CAC, EGR, ETC.

  • INSPECT THE EGR COOLER FOR SOOT BLOCKAGE, CLEAN AS NEEDED.

  • TEST AND INSPECT THE "EXHAUST VALVE" (BUTTERFLY VALVE) AND ALL AIR HOSES TO ENSURE VALVE IS WORKING PROPERLY, VALVE CAN BE CYCLED via ISUZU IDSS2 (Exhaust Valve is required for proper DPF REGENERATION) 

  • TEST AND INSPECT THE INTAKE THROTTLE VALVE (WHERE APPLIES) via ISUZU IDSS2 (ITV IS REQUIRED FOR PROPER DPF REGENERATION)

  • INSPECT THE EGR VALVE & SYSTEM (REMOVE AND CLEAN AS NEEDED - IF HEAVY OIL/SOOT DISCOVERED)


 

60M


100,000 MILES
  / 5,000 HOURS
    / 60 MONTHS

Replace the following:​

  • DEF FLUID FILTER

  • SERPENTINE DRIVE BELTS


 

Service the following:

  • SERVICE DIESEL PARTICULATE FILTER (SEE "DPF MAINTENANCE" FOR DETAILS) 

  • ADJUST THE DPF DIFFERENTIAL PRESSURE SENSOR "ZERO-POINT" USING ISUZU IDSS2

  • INSPECT THE DPF DIFFERENTIAL PRESSURE SENSOR TUBING & WIRING HARNESS FOR CRACKS AND DAMAGE, REPLACE AS NEEDED

  • INSPECT THE EXHAUST SYSTEM FOR ANY LEAKS OR DAMAGE, REPAIR AS NEEDED

  • STEAM CLEAN THE ENGINE BLOCK AND COMPARTMENT


 

Please Note: All DAILY and MONTHLY "Inspections" are NOT listed here. Please go back to the Isuzu Engine page to locate link for Engine Routine Inspections.

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