3-9. CRANKCASE DEPRESSION REGULATOR (CDR) VALVE AND BRACKET
MAINTENANCE
This task covers:
a. Testing
c.
Cleaning and Inspection
b. Removal
d.
Installation
b. Removal
NOTE
CDR valves on vehicles equipped with deep water fording kit
contain two additional vent lines.
1.
Loosen clamp (5) and disconnect CDR valve oil fill tube hose (4) from CDR valve (7).
2.
Remove two screws (1), washers (2), and CDR valve (7) from CDR valve bracket (3) and intake
crossover hose (6).
3.
Remove two nuts (9) from CDR valve bracket (3) and intake manifold studs (10).
4.
Remove two nuts (8) and CDR valve bracket (3) from two valve cover studs (11).
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 pressure, add amount the water travels in
column above zero to the amount the water travels in column
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 in.
6.
If pressures are not within specifications in steps 4 and 5, replace CDR valve (7) and repeat test.
7.
Install engine oil dipstick in oil dipstick tube (para. 3-2).
INITIAL SETUP:
Test Equipment
Manometer, U-tube
(Appendix B, Section IV, Item L)
Tools
General mechanic’s tool kit:
automotive (Appendix B, Item 1)
Maintenance and repair shop equipment:
automotive (Appendix B, Item 2)
Manual References
TM 9-2320-387-10
TM 9-2320-387-24P
Equipment Condition
• Hood raised and secured (TM 9-2320-387-10).
• Engine access cover removed (para. 10-22).
Maintenance Level
Unit
TM 9-2320-387-24-1
3-16
Change 1
a. Testing
