TM 5-2420-231-23-1
0021
Table 1. Engine Coolant Temperature Gauge Indicates High Temperature,
Does Not Function, or Is Inaccurate - Continued.
021
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Engine Coolant Temperature 13.
Inspect water pump pulley
Water Pump Pulley OK - Proceed to
Gauge Indicates High
(Figure 16, Item 2) on water pump
step 14.
Temperature, Does Not
(Figure 16, Item 1). Pulley should
Water Pump Pulley Loose - Replace
Function, or Is Inaccurate -
be tight and secure.
water pump (WP 0128).
Continued
Proceed to Test Step 9.
14. Rotate water pump pulley
Water Pump Pulley OK - Proceed to
(Figure 16, Item 2) by hand. Pulley
step 15.
should rotate quietly and smoothly
Water Pump Noisy When Rotated -
without sticking or binding.
Replace water pump (WP 0128).
Proceed to Test Step 9.
Water Pump Pulley Binds, Sticks, or
Is Rough When Rotated - Replace
water pump (WP 0128).
Proceed to Test Step 9.
Figure 16. Water Pump and Drive Pulley.
0021
15. Inspect drive belt tensioner mount- Drive Belt Tensioner Mounting Bolt
ing bolt.
OK - Proceed to step 16.
Drive Belt Tensioner Mounting Bolt
Loose - Tighten drive belt tensioner
mounting bolt (WP 0133).
Proceed to Test Step 9.
16. Visually inspect drive belt ten-
Drive Belt Tensioner Pulley OK -
sioner pulley (Figure 17, Item 3) for
Proceed to step 17.
wear and damage. Verify that drive
Drive Belt Tensioner Pulley Worn or
belt tensioner bolt (Figure 17,
Damaged - Replace drive belt
Item 2) is tight and secure.
tensioner (WP 0133).
Proceed to Test Step 9.
