Section 10
--- Chassis Information
Cayman 2005
356
Coolant Levels:
• Check the coolant level daily or when refueling.
• If the coolant is below the MIN mark, the low coolant alarm will sound and the low coolant
light will appear on the dash.
• The coolant level remains between the MAX and MIN level in the reservoir.
NOTE:
Coolant must be changed every two years. The preferred coolant must meet Cummins
specifications. An acceptable heavy/duty antifreeze/coolant, meeting ATSM D4985 or
ATSM D6210 specifications, can be used.
INFORMATION:
Refer to the Engine Manufacturer Owner’s Manual for details on engine coolant main-
tenance.
If the addition of coolant is necessary, simply remove the cap from the surge tank and add the proper
mixture of coolant to the system until it reaches the proper level.
Understand that adding straight water or antifreeze to the system creates an imbalance of the coolant
mixture. While adding small amounts occasionally may not affect the mixture greatly, large amounts
(1/2 gallon) or frequent "top-offs" will.
Three components necessary for the proper coolant mixture are clean water, glycol antifreeze
(ethylene or propylene), and Supplemental Coolant Additives (SCA). The water in the coolant system
serves as the "base." It is critical to use as pure of water as possible. Salts and other minerals in the water
can solidify in the cooling system causing scaling and "clogging" of the radiator.
NOTE:
Fully-Formulated Propylene Glycol-Based Engine Coolant for Heavy-Duty Engines
meeting ATSM D6211-98a should be used.
Glycol antifreeze, usually in the form of ethylene glycol or propylene glycol, provides an increased
boiling point of the coolant mixture, increased freeze protection, and helps prevent water pump
cavitation (air bubbles in the coolant mixture that can result in wear of the engine). While the ratio of
water and glycol can be adjusted to meet differing anti-boil and freeze protection, it is recommended that
a mixture of 50% water and 50% glycol be used. This 50/50 mixture provides freeze protection to -32º
Coolant Additives - SCA
Additives required for the proper maintenance of the cooling system consist of Supplemental Coolant
Additives (SCA). SCA provides corrosion protection for metals, protection from cavitation and contains
anti-foaming agents. Inadequate amounts of SCA will not provide adequate protection of the system,
excessive amounts can also create cooling system problems.
Over-concentration of SCA can result in the additives dropping out of the solution and solidifying, the
outcome of which is the likelihood of scale and sludge forming that restricts coolant flow.
Содержание Cayman 2005
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