SERIES 60 ON-HIGHWAY ENGINE OPERATOR'S GUIDE Item 25 – Crankcase Breather The rocker cover-mounted breather assembly (part number 23512984) used in the closed crankcase breather system should be replaced every 4000 operating hours. It is not reusable and no attempt should be made to clean or reuse it. The internally mounted (in the engine rocker cover) crankcase breather assembly (see Figure 19) should be removed and the steel mesh pad washed in clean fuel oil every 100,000 to 120,000 miles (160,000 to 192,000 km) on vehicle engines. This cleaning period may be reduced or lengthened according to the severity of service.
Item 26 – Engine Tune-Up There is no scheduled interval for performing an engine tune-up. However, the valve lash and injector heights must be measured and, if necessary, adjusted at the initial interval listed in Table 14. Once the initial measurements/ad- justments have been made, any adjustments beyond this point should be made only as required to maintain satisfactory engine performance. Figure 19 Internal Breather (in Rocker Cover) Table 14 Initial Valve Lash and Injector Height Adjustment All information subject to change without notice.
73 DDC-SVC-MAN-0039 Copyright © 2009 DETROIT DIESEL CORPORATION Engine Application Measurement/Adjustment Period Vehicle Engines 60,000 Miles (96,000 km) or 24 Months, whichever comes first