CRANKCASE DEPRESSION REGULATOR (CDR) VALVE AND BRACKET MAINTENANCE

TM 9-2320-280-20-2 3-9. CRANKCASE DEPRESSION REGULATOR (CDR) VALVE AND BRACKET MAINTENANCE This task covers: a. Testing c. Cleaning and Inspection b. Removal d. Installation INITIAL SETUP: Tools Manual References General mechanic’s tool kit: TM 9-2320-280-10 automotive (Appendix B, Item 1) TM 9-2320-280-24P Test Equipment Equipment Condition Manometer, U-tube Hood raised and secured (TM 9-2320-280-10). (Appendix B, Section IV, Item L) Engine access cover removed (para. 10-15). a. Testing 1. Remove engine oil dipstick from oil dipstick tube (para. 3-2). 2. Install manometer in dipstick tube. 3. Connect STE/ICE-R unit to DCA connector. NOTE To read manometer, add amount the water column travels above zero to the amount the water column travels below zero. 4. Start engine and let idle; record water pressure. Pressure should be zero inches of water or a slight vacuum. 5. Increase engine speed to 2,000 rpm; record water pressure. Pressure should be 2-5 inches. 6. If pressures are not within specifications listed in steps 4 and 5, replace CDR valve (9) and repeat test. 7. Install oil dipstick in engine oil dipstick tube (para. 3-2). NOTE CDR valves on vehicles equipped with deep water fording kit contain two additional vent lines. 1. Loosen clamp (7) and discomect CDR valve oil fill tube hose (8) from CDR valve (9). 2. Loosen clamp (6) on CDR valve intake manifold hose (5). 3. Remove two screws (1), washers (2), CDR valve (9), and heater control cable clamp (3) horn CDR valve bracket (4). 4. Remove two nuts (10) from CDR valve bracket (4) and two intake manifold studs (11). 5. Remove two nuts (13) and CDR valve bracket (4) from two valve cover studs (12). 3-14