How to Procedures NOTICE: Fuel filter elements will turn black over time. This is normal for DD5/DD8 only. Do not replace filters solely because of this condition. Replace filters between normal service intervals only if required by troubleshooting. NOTE: If you are replacing all fuel filters, it is not necessary to run the engine and test for leaks after installing each individual fuel filter. However, if repairing a leak at one filter, complete that repair and test the system for leaks after priming the fuel system. Filters are an integral part of the fuel system. Proper filter selection and maintenance are important to satisfactory engine operation and service life.
Filters should be used to maintain a clean system, not to clean up a contaminated system. The scheduled maintenance intervals for the appropriate duty cycles are listed in this manual. WARNING: PERSONAL INJURY To prevent the escape of high pressure fuel that can penetrate skin, ensure the engine has been shut down for a minimum of 10 minutes before servicing any component within the high pressure circuit. Residual high fuel pressure may be present within the circuit. NOTICE: At cold temperatures (-40° C or -40° F), DO NOT remove the filter elements from the caps unless the intent is to replace the filter elements. Repeated removals at cold temperatures may break the filter element tabs.
Removal of the Fuel Prefilter Remove the prefilter as follows: 1. Using a 36 mm socket, unscrew the prefilter cap. 2. Pull the cap and prefilter straight up and out of the fuel filter housing. 3. Remove the prefilter (1) from the prefilter cap (2) by placing the filter on a solid surface and apply pressure on prefilter cap (2) at an angle. 88 All information subject to change without notice. Copyright © 2017 DETROIT DIESEL CORPORATION DDC-SVC-MAN-0192