Air Intake Piping And Clamps; Coolant Freeze Point - Navistar MaxxForce 7 Operation And Maintenance Manual

SECTION 5 – MAINTENANCE SCHEDULE AND SERVICE PROCEDURES
Service Procedures (cont.)

AIR INTAKE PIPING AND CLAMPS

For any of the following conditions, install new parts:
• Loose hoses or clamps, tighten or replace as required
• Ruptured hoses
• Cracked air cleaner housing
• Damaged Charge Air Cooler (CAC)

COOLANT FREEZE POINT

Service Interval: 15,000 miles (24,000 km), 6 months, 500
hours, or 2000 gallons (7570 liters) of fuel
CAUTION: To prevent engine damage, do not use Dex-cool
®
MaxxForce 7 engines.
ELC 50/50 Premix provides freeze protection to -34°F (-36°C)
and maximum corrosion protection. If a customer wishes to
use a conventional (non-OAT ELC) coolant, it should minimally
meet ASTM D6210, Standard Specification for fully Formulated
Glycol Base Engine Coolant for Heavy Duty Engines. ELC 50/50
Premix is used to replenish coolant loss and ensure that glycol /
water concentrations stay in balance.
ELC 50/50 Extender is added at the designated service interval.
Freeze Point Protection Levels Concentrate (Ethylene
Glycol) and Water Mixtures
Concentrate and Water
Mixtures
40% Concentrate and 60%
water
50% Concentrate and 50%
water
60% Concentrate and 40%
water
67% Concentrate and 33%
water
®
in
CAUTION: To prevent engine damage, do not use a concentrate
and water mixture of less than 40% concentrate.
For vehicles operating in extremely cold climates, coolant
mixtures of 60% Concentrate and 40% water or 67%
Concentrate and 33% water provide additional freeze protection
as shown in the table above. Mixtures having more than 67%
Concentrate are not recommended.
Check freeze point with a refractometer.
1. Put drop of coolant on refractometer window.
2. Look through eyepiece and focus.
3. Record freeze point.
Freeze Point Protection
-12°F (-24°C)
–34°F (37°C)
-62°F (-52°C)
-95°F (-71°C)
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