Isuzu AU-4LE1T Maintenance Manual page 106

32. EGR valve check and Check and clean EGR valve every 1500 hours.
cleaning
33. EGR lead valve Clean EGR lead valve every 1500 hours.
cleaning
34. EGR cooler cleaning Clean EGR cooler every 1500 hours.
Check and replace every 24 months.
35. Fuel & cooling water
rubber hoses
replacement
36. Engine starting Check engine stability and noise.
conditions and noise
conditions
Check exhaust smoke color.
37. Exhaust smoke
condition
Check every 1000 hours.
38. Cylinder compression
pressure
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 Perform the adjustment, cleaning, repair or replacement every 1500 hours.
ventilation valve (This is a required maintenance)
cleaning
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