MBE 900 ENGINE 2007 OPERATOR'S GUIDE 2. Check all cooling system pipes and hoses for damage and leaks; ensure they are positioned to avoid chafing, and are securely fastened. impose extra loads on the crankshaft, fan and/or alternator bearings, shortening both belt and bearing life. Excessively overtightened belts can result in crankshaft breakage. A loose belt will slip and generate excessive heat that may cause damage to the belt and accessory drive components. 3. Check the outside of the radiator and condenser for blockage. Check fins for damage; straighten them if necessary.
Item 3 Valve Lash Checking and Adjustment PERSONAL INJURY Valve lash checking and adjustment should be performed per the maintenance intervals prescribed under the proper service category for the engine, Refer to section Scheduled Intervals in this guide. All three service categories (Severe, Short Haul, and Long Haul) require a “first time” valve lash adjustment at a shorter interval. After the initial adjustment, all others are based on the same mileage intervals. Refer to section Maintenance Tables in this guide. Proper valve lash clearance allows the engine to produce the best possible performance with the lowest emissions.
Valve lash adjustments should be performed by an authorized Detroit Diesel maintenance or repair facility. To avoid injury from rotating belts and fans, do not remove and discard safety guards. Belt Replacement – Drive belts (V and poly-V) should be replaced every 2,000 hours or 100,000 miles (160,000 km). After an extended time in service, minor rib cracks may appear, usually one or two cracks per inch is considered normal. See Figure 29 A concern occurs when the belt ribs exhibit severe multiple cracking or “chunking”. At this point, the belt should be replaced. Item 4 Drive Belts Belts should be neither too tight nor too loose.
Belts that are too tight All information subject to change without notice. (Rev. 04/08) 79 DDC-SVC-MAN-0040 0704 Copyright © 2008 DETROIT DIESEL CORPORATION