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OM-2053
FREEZING POINT
(FAHRENHEIT)
20
+10
0
-10
-20
-30
-40
-50
-60
-70
(4) Installing the antifreeze solution
Before installing antifreeze in the system, make the following checks:
(a) Check the system for signs of leaks
(b) Inspect all hoses and tighten all hose clamps. Install new hoses if necessary.
(c) Drain and clean the system. Ref. Paras. 7,E and 7,F.
(d) Check the condition and tension of the engine V-belt. Replace the V-belt if necessary.
(e) Be sure radiator and engine drain valves are closed, and all connections are securely tight-
ened.
(f) Install the required amount of antifreeze: 20 quarts. Fill the system with coolant as outlined un-
der Para. 7, H.
E. Draining the Cooling System
Drain the cooling system immediately after stopping the engine, while most of the sediment is in sus-
pension. Proceed as follows:
(1) Remove radiator cap.
(2) Open radiator drain valve (at bottom of radiator) and engine drain valves. See Perkins Diesel
Shop Manual for exact locations of engine coolant drain valves.
NOTE: When draining the system for storage, remove all drain valves and remove drain plug.
(3) Allow the system to drain completely.
NOTE: Be sure the drain valves do not plug-up during draining.
(4) When the system is completely drained, close all drain valves except when draining for storage.
F. Cleaning the Cooling System
Drain and thoroughly flush the coolng system twice a year or more often if necessary. The appear-
ance of rust in the radiator, or in the coolant is an indication that the inhibitor has become weakened
and it is possible that some sludge has accumulated in the system. When this condition exists, pro-
ceed as follows:
(1) Run the engine until it reaches normal operating temperature; then stop the engine and drain the
cooling system (Ref. Para. 7, E).
2-1
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PERCENTAGE OF ANTI-
FREEZE IN SOLUTION
16%
25%
33-1/3%
40%
45%
50%
54%
58%
62%
65%
Antifreeze Solution Table
Figure 2
December 31/91 Revised
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Table of Contents
Troubleshooting
