TK 61753-2-MM-EN
59
temperatures. This antifreeze mixture will provide the required corrosion protection and lubrication for the water pump.
Checking the Antifreeze
Check the solution concentration by using a temperature compensated antifreeze hydrometer or a refractometer (P/N
204-754) designed for testing antifreeze. Maintain a minimum of 50 percent permanent type antifreeze concentrate and
50 percent water solution to provide protection to -30 F (-34 C). Do not mix antifreeze stronger than 68 percent
permanent type coolant concentrate and 32 percent water for use in extreme temperatures.
Changing the Antifreeze
1. Run the engine until it is up to its normal operating temperature. Stop the unit.
CCAAUUTTIIOONN
RRiisskk ooff IInnjjuurryy!!
AAvvooiidd ddiirreecctt ccoonnttaacctt wwiitthh hhoott ccoooollaanntt..
2. Open the engine block drain (located behind the starter) and completely drain the coolant. Observe the coolant
color. If the coolant is dirty, proceed with steps a, b, and c. Otherwise proceed to step 3.
a. Run clear water into the radiator and allow it to drain out of the block until it is clear.
b. Close the block drain and install a commercially available radiator and block flushing agent, and operate the unit
in accordance with instructions of the flushing agent manufacturer.
CCAAUUTTIIOONN
RRiisskk ooff IInnjjuurryy!!
AAvvooiidd ddiirreecctt ccoonnttaacctt wwiitthh hhoott ccoooollaanntt..
c. Open the engine block drain to drain the water and flushing solution.
3. Inspect all hoses for deterioration and hose clamp tightness. Replace if necessary.
4. Loosen the water pump belt. Check the water pump bearing for looseness.
5. Inspect the radiator cap. Replace the cap if the gasket shows any signs of deterioration.
6. If using ELC concentrate, mix one gallon of ELC concentrate and one gallon of de-ionized or distilled water in a
container to make a 50/50 mixture (Do not add antifreeze and then water to the unit. This procedure may not give a
true 50/50 mixture because the exact cooling system capacity may not always be known).
7. Refill the radiator with the 50/50 antifreeze mixture and verify to bleed the air from the cooling system as needed.
Bleeding Air from the Cooling System
Jiggle pin thermostats are original equipment on units that have engines from the TK486 family of engines. Jiggle pin
thermostats make it unnecessary to bleed the air out of the engine block because they keep air from being trapped in
the engine block. Normally, all but about 1.5 qt (1.4 liters) of coolant drain out of the cooling system when it is drained.
If approximately half of the Cooling System Capacity (see Specifications Chapter) seems to fill the cooling system after
it has been drained, air has been trapped in the block. Bleed the air out of the block using the following procedure:
NNOOTTIICCEE
EEqquuiippmmeenntt DDaammaaggee!!
DDoo nnoott ssttaarrtt tthhee eennggiinnee wwiitthhoouutt bblleeeeddiinngg tthhee aaiirr oouutt ooff tthhee bblloocckk..
NNoottee:: If an engine runs with air trapped in the block, the engine may be damaged. The high water temperature switch
may not protect an engine that has air trapped in the block, because the high water temperature switch is
designed to protect an engine from overheating due to failures in the cooling system.
1. Remove the plug from the front end of the water pump below the thermostat housing as shown (Figure 12, p. 60).
2. Slowly pour the coolant into the system until you see coolant at the plug fitting.
3. Reinstall the plug.
4. Pour coolant into the system until it appears to be full.
EEnnggiinnee MMaaiinntteennaannccee
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