operators_manual

Engine Coolant
Specifications
Engine capacity, pressure, and
temperature specifications.
Engine Coolant Specifications for
PACCAR PX-7
Coolant Capacity
(engine only)
3.0 gal (11.5 liters)
Standard
modulating
thermostat range
186-207°F
(86-97°C)
Minimum
recommended
pressure cap
15 psi (103 kPa)
Maximum
recommended
pressure cap
25 psi (172 kPa)
Minimum
recommended
operating
temperature
160°F (71°C)
Maximum allowed
operating
temperature
225°F (107°C)
NOTE
Coolant volumes are dependent on
chassis model and cab/ sleeper heater
options.
Extended Life Coolant
Information on using Extended Life Coolant
(ELC).
Perform these maintenance procedures
according to the Preventative Maintenance
Schedule.
• Conduct coolant maintenance checks
including freeze point, pH, nitrite and
carboxylate tests at least twice
annually to maintain engine
protection.
Nitrited Extended Life Coolant
For nitrited formulations (NOAT), a heavy-
duty extended life coolant that meets
ASTM D6210 and Caterpillar EC-1
specifications must be used.
The change interval for extended-life
coolant containing nitrite and molybdate is
750,000 miles (1,200,000 km) or 12,000
hours of on-road use (8 years or 15,000
hours of off-highway use) on initial fill with
no extender added. The change interval is
1,000,000 miles (1,600,000 km)/20,000
hours/8 years with an extender addition at
500,000 miles (800,000 km)/10,000
hours/4 years.
Nitrite-Free Extended Life Coolant
Nitrite-free organic acid technology coolant
(OAT) may be used if it meets DAF 74002.
The change interval for nitrite free coolant
is 600,000 miles (1,000,000 km) or 6
years, with no extender needed. DO NOT
add coolant extender to nitrite-free coolant.
Follow the coolant supplier's drain/flush/fill/
diluting percentages when servicing a
vehicle filled with nitrite-free coolant.
Additional Recommendations:
ENGINE MAINTENANCE - Engine Coolant Specifications
54 Y53-1183-1E1 (04/16/18)
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