Engine Rebuild Guide, Break-In and Tune-Up
02
010
20
DPSG,OUO1004,922 –19–01JUL99–2/2
TS281 –UN–23AUG88
Service Cooling System Safely
RG8246 –UN–06DEC97
Coolant Drain Valve
A—Coolant Drain Valve
CAUTION: Do not drain coolant until the coolant
temperature is below operating temperature.
Always loosen coolant drain valve (A) slowly to
relieve any excess pressure.
6. Remove and check thermostat(s). (See REMOVE AND
TEST THERMOSTATS in Group 025.)
7. Drain and flush cooling system. (See FLUSH AND
SERVICE COOLING SYSTEM in Group 002.)
IMPORTANT: Air must be expelled from cooling
system when system is refilled. Loosen
temperature sending unit fitting at rear
of cylinder head, bleed plug at top front
of cylinder head, or plug in thermostat
housing to allow air to escape when
filling system. Retighten fitting or plug
when all the air has been expelled.
8. Fill cooling system with coolant. Follow
recommendations in Group 002. (See DIESEL
ENGINE COOLANT RECOMMENDATIONS in Group
002.)
9. Run engine until it reaches operating temperature.
Check entire cooling system for leaks.
10. After engine cools, check coolant level.
NOTE: Coolant level should be even with bottom of
radiator filler neck.
11. Check system for holding pressure. (See PRESSURE
TEST COOLING SYSTEM AND RADIATOR CAP in
Section 04, Group 150.)
CTM100 (06APR04)
02-010-20
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=68
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