Engine Valve Adjust Intervals
Vehicle Application Interval
Valve Adjust Interval
Normal Duty (Line Haul) - less than 20%
idle time
Initial adjust at 150,000 mi (240,000 km,
6,750 hours), at 450,000 mi (725,000 km,
13,500 hours), then every 300,000 mi
(480,000 km) thereafter
Normal Duty (Line Haul) - more than 20%
idle time
Severe Duty (Vocational)
39
Initial adjust at 60,000 mi (96,000 km,
1,600 hours), at 360,000 mi (576,000 km,
9.600 hours), then every 300,000 mi
(480,000 km) thereafter
Pick-up/Delivery/Refuse
Engine Identification
Component Locations
39
Vocational vehicle applications include: Agriculture, Concrete Mixers, Construction, Crane, Dumps, Emergency/Fire, Heavy
Equipment, Loggers, Mining, Oil Field, Snowplows, and Wrecker.
ENGINE MAINTENANCE - Engine Identification
Y53-1166-1M1 (10/2020) 97
2
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