Preventive Maintenance Intervals WARNING: HOT COOLANT To avoid scalding from the expulsion of hot coolant, never remove the cooling system pressure cap while the engine is at operating temperature. Wear adequate protective clothing (face shield, rubber gloves, apron, and boots). Remove the cap slowly to relieve pressure. 1. Inspect the radiator, condenser, coolant pump, engine oil cooler, freeze plugs, and heat exchanger for damage and leaks. 2. Check all cooling system pipes and hoses for damage and leaks; ensure these components are positioned to avoid chafing and are securely fastened. 3. Check the outside of the radiator and condenser for blockage.
Check fins for damage; straighten them if necessary. Valve Lash Checking and Adjustment Valve lash checking and adjustment should be performed per the maintenance intervals prescribed under the proper service category for the engine. 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 other adjustments are based on the same mileage intervals. 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™ maintenance or repair facility.
Drive Belts DD Platform engines utilize a specially designed Ethylene Propylene Diene Monomer (EPDM) belt material which is exclusive to the Original Equipment Manufacturer (OEM) component. Replacement with an aftermarket part may lead to shortened maintenance intervals and excessive noise. Drive belts wear differently based on environmental conditions and vehicle duty cycle. If the vehicle is operated in extremely hot or cold climates, or is exposed to significant dust/debris/road salt, lifetime of the belts may be significantly reduced. Fuel Filters The prefilter is housed within the fuel filter module.
The prefilter element filters particles down to 100 microns and is snapped into the prefilter cap. The final filter is housed within the fuel filter module. The final filter has the task of filtering out particles down to two microns. The final fuel filter snaps into the fuel filter cap on DD5 engines and twists into the cap on DD8 engines. Air System The air cleaner restriction indicator (filter minder) should be inspected per the maintenance intervals or more often if the engine is operated under severely dusty conditions. Replace the element if the filter minder has reached maximum allowable restriction. Refer to OEM literature for further details on filter minders.
58 All information subject to change without notice. Copyright © 2017 DETROIT DIESEL CORPORATION DDC-SVC-MAN-0192