MCi Crusader II 1989 Maintenance Manual page 210

Date
1-1-89
Page 6-11
MC-9 MAINTENANCE MANUAL
5. Continue adding coolant to the recovery tank. five gallons
(18.9 litersJ at a time. until the pump and tell-tale light shut off. At
this point the cooling system is full.
6. Fill the recovery tank until coolant is four to six inches
(102-153 mmI from the top of the filler tube. This space will allow
the coolant to expand as it warms up, without overflowing.
CAUTION: Never pour cold coolant Into a
hot engine. The sudden change in tempera-
ture may crack the cylinder head or block.
WATER PUMP SEAL
Engines built prior to January 1987 have water pump seals
made of a material which tends to harden at high temperatures.
As of that date. Detroit Diesel changed the seal to one made of a
material which performs better at high temperatures.
The water pump seal sho!Jld be replaced after it has been in
service for 200.000 miles or 6.000 hours.
ALARM STATS
Two alarmstats activate the warning light and buzzer that
indicate engine overheating. See figure 6-12. Further informa-
tion on thealarmstats can be found in Section 7 of this manual.
I · . . _ ·
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Figure 6-12. Left and Right Side Alarmstats.
RADIATORS
Twin radiators are mounted at the rear corners of the coach
(in engine compartment) at a height which minimizes the intake
of dust and road dirt.
The radiators are designed to reduce the temperature of the
coolant under all operating conditions. It is essential that the
radiator cores be kept free from corrosion and debris at all times
in
conjunction with the regular maintenance of the other com-
ponents of the cooling system.
Radiators with larger capacity.are installed on those coaches
with 8V-92TA engines. Refer to specifications at the end of this
section for the capacities of the cooling system with standard or
larger radiators. or with the coolant recovery system.
RADIATOR SHUTTERS ANO SHUTTERSTATS
An air-operated shutter assembly is provided on the intake
side of each radiator core. Each shutter assembly is controlled
by a separate air cylinder. See figure
6-13.
The air supply to the
cylinders is controlled by the shutterstat, which is mounted on
the right-hand radiator inlet line.
Figure 6-13. Shutter Air Cylinder.
The shutterstat controls the supply of compressed air to the
radiator shutter air cylinders. It is mounted on the right-hand
radiator inlet line and can be reached for service by opening the
rear engine compartment ?ervice doors. Refer to figure 6-14.
Figure 6-14. Shutterstat.
When the engine coolant reaches the temperature of the
shutterstat setting. the shutterstat cuts off the air supply to the
radiator shutter air cylinder. and the shutters open. When the
coolant temperature is below the setting of the shutterstat. air Is
allowed to enter the radiator shutter air cylinders. closing the
shutters.
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