Isuzu AU-4LE1T, Maintenance Manual

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32. EGR valve check and
cleaning
Check and clean EGR valve every 1500 hours.
33. EGR lead valve
cleaning
Clean EGR lead valve every 1500 hours.
34. EGR cooler cleaning
Clean EGR cooler every 1500 hours.
35. Fuel & cooling water
rubber hoses
replacement
Check and replace every 24 months.
36. Engine starting
conditions and noise
conditions
Check engine stability and noise.
37. Exhaust smoke
condition
Check exhaust smoke color.
38. Cylinder compression
pressure
Check every 1000 hours.
39. Valve clearance check Incorrect valve clearance will result in increased engine noise and lower engine output.
Thereby adversely affecting engine performance.
Check and adjust every 1000 hours.
40. Positive crankcase
ventilation valve
cleaning
Perform the adjustment, cleaning, repair or replacement every 1500 hours.
(This is a required maintenance)