Cummins N14 STC, Celect, Celect Plus – Service Manual 008-018   Cooling System

CAUTION  Do not use caustic cleaners in the cooling system. Aluminum components will be damaged.

The cooling system must be clean to work correctly and to eliminate buildup of harmful chemicals.

The performance of RESTORE™ is dependent on time, temperature, and concentration levels. An extremely scaled or flow-restricted system, for example, can require higher concentrations of cleaners, higher temperatures, or longer cleaning times or the use of RESTORE PLUS™. RESTORE™ can be safely used up to twice the recommended concentration levels; RESTORE PLUS™ must be used only at its recommended concentration level. Extremely scaled or fouled systems can require more than one cleaning.

• RESTORE™ CC2610 (1 gallon)
• RESTORE™ CC2611 (5 gallons)
• RESTORE™ CC2612 (55 gallons)
• RESTORE PLUS™ CC2638 (1 gallon)

WARNING  Coolant is toxic. Keep away from children and pets. If not reused, dispose of in accordance with local environmental regulations.

Drain the cooling system.

Do not allow the cooling system to dry out. RESTORE™ will not be as effective if the cooling system is allowed to dry.

Do not remove the coolant filter.

CAUTION  Fleetguard® RESTORE™ contains no antifreeze. Do not allow the cooling system to freeze during the cleaning operation.

Immediately add 3.8 liters [1 gal] of Fleetguard® RESTORE™, RESTORE PLUS™, or equivalent, for each 38 to 57 liters [10 to 15 gal] of cooling system capacity, and fill the system with plain water.

Turn the heater temperature switch to high to allow maximum coolant flow through the heater core. The blower does not have to be on.

Operate the engine at normal operating temperatures (at least 85°C [185°F]) for 1 to 1-1/2 hours.

Shut the engine OFF, and drain the cooling system.

Fill the cooling system with clean water to flush the cooling system.

WARNING  Coolant is toxic. Keep away from children and pets. If not reused, dispose of in accordance with local environmental regulations.

Operate the engine at high idle for 5 minutes with the coolant temperature above 85°C [185°F].

Shut the engine OFF, and drain the cooling system.

NOTE: If the water being drained is still dirty, the system must be flushed again until the water is clean.

Fill the cooling system with heavy-duty coolant. Heavy-duty coolant is defined as a correct mixture of good-quality water, low-silicate antifreeze, and supplemental coolant additives.

CAUTION  Engine damage will result if the valve is left closed.

Open the shutoff valve, and install the coolant system pressure cap.

Operate the engine until it reaches a temperature of 80°C [180°F], and check for coolant leaks.

Low-silicate antifreeze must be mixed with quality water at a 50/50 ratio (40- to 60-percent working range). A 50/50 mixture of antifreeze and water gives a -34°F freezing point and a boiling point of 228°F, that is adequate for locations in North America. The actual lowest freezing point of ethylene glycol antifreeze is at 68 percent. Using higher concentrations of antifreeze will raise the freezing point of the solution and increase the possibility of a silica gel problem.

The Fleetguard® refractometer, Part Number C2800 or equivalent, provides a reliable and easy-to-read measurement of freezing point protection and glycol (antifreeze) concentration.

The freezing point protection must be checked if coolant is added to the cooling system. Refer to the OEM service manual and manufacturer’s instructions for correct operation.

Floating ball hydrometers will not give correct readings.

Close the radiator draincocks.

Install the lower radiator hose(s).

Tighten the hose clamps.

Close the engine draincock.

Close the oil cooler draincock or plug.

Cummins Inc. recommends using either a 50/50 mixture of good quality water and fully formulated antifreeze, or fully formulated coolant when filling the cooling system. The fully formulated antifreeze or coolant must meet TMC RP 329 or TMC RP 330 specifications.

Good quality water is important for cooling system performance. Excessive levels of calcium and magnesium contribute to scaling problems, and excessive levels of chlorides and sulfates cause cooling system corrosion.

Cummins Inc. recommends using Fleetguard® Compleat™. It is available in both glycol forms (ethelyne and propylene) and complies with TMC standards.

Fill the cooling system with heavy duty coolant and install the correct service filter.

NOTE: Some radiators have two fill locations, both of which must be filled when the cooling system is drained.

Fill the cooling system with coolant to the bottom of the fill neck in the radiator fill (or expansion) tank.

Install the radiator or expansion tank fill cap.

Operate the engine until it reaches a temperature of 82°C [180°F], and check for leaks.

WARNING  Do not remove the pressure cap from a hot engine. Wait until the coolant temperature is below 50°C [120°F] before removing the pressure cap. Heated coolant spray or steam can cause personal injury.

Shut the engine OFF, and allow it to cool.

CAUTION  Do not add cold coolant to a hot engine. This can cause engine casting damage. Allow the engine to cool to below 50°C [120°F] before adding coolant.

Remove the radiator or fill cap, and check the coolant level per the OEM service manual recommendations. Add coolant if necessary. Do not over fill.

WARNING  Wait until the temperature is below 50°C [120°F] before removing the coolant system pressure cap. Failure to do so can cause personal injury from heated coolant spray.

To confirm and locate external cold coolant leaks, it is not necessary to warm the engine.

Check the coolant level per the OEM service manual recommendations and fill, if necessary.

Add heavy duty coolant.

CAUTION  Do not apply more than 140 kPa [20 psi] air pressure to the cooling system. The water pump seal can be damaged.

If the radiator is equipped with a pressure relief valve, install a plug into the overflow tube (1).

Install the pressure tester onto the radiator fill neck or surge tank, if equipped, and apply 140 kPa [20 psi] maximum air pressure.

Inspect for coolant leaks and repair, if necessary.

Remove the pressure test equipment and the plug from the pressure relief valve overflow tube, if equipped.

Install the coolant system pressure cap.