Blue Bird Coachworks 450 LXi, Руководство пользователя

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450 LXi Owner Manual 5-3 Engine Maintenance
Rev. “C”
~ 5-3-5 ~
5-3.2.1 Glycol
Glycol in the coolant helps to provide protection against the following conditions:
Boiling
Freezing
Cavitation of the water pump and cylinder liners
For optimum performance, Caterpillar recommends a 1:1 mixture of a water/glycol solution.
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Refer to the following two tables for additional information.
Most conventional heavy-duty coolant/antifreezes use ethylene glycol. Propylene glycol may also be used. In a 1:1 mixture
with water, ethylene and propylene glycol provide similar protection against freezing and boiling. Refer to the following two
tables for additional information.
Ethylene Glycol
Concentration Freeze Protection Boil Protection
50 Percent -37°C (-34°F) 106°C (223°F)
60 Percent -51°C (-60°F) 111°C (232°F)
Propylene Glycol
Concentration Freeze Protection Boil Protection
50 Percent -32°C (-26°F) 106°C (223°F)
To check the concentration of glycol, use the 1U-7298 Coolant/Battery Tester (Degree Celsius) or use the 1U-7297 Coolant/
Battery Tester (Degree Fahrenheit). The testers give readings that are immediate and accurate. The testers can be used with
ethylene or propylene glycol.
Testing the engine coolant is important to ensure that the engine is protected from internal cavitation and from corrosion. The
analysis also tests the ability of the coolant to protect the engine from boiling and from freezing. The S•O•S Coolant Analysis
can be done at your Caterpillar dealer. Caterpillar S•O•S Coolant Analysis is the best way to monitor the condition of your
coolant and your cooling system. S•O•S Coolant Analysis is a program that is based on periodic samples.
5-3.2.2 S•O•S Coolant Analysis
Recommended Interval
Type of Coolant Level 1 Level 2
DEAC Every 250 Hours Yearly
(1)
ELC Not Required Yearly
(1) The Level 2 Coolant Analysis should be performed sooner if a problem is
identifi ed by a Level 1 Coolant Analysis.
NOTE: Propylene glycol coolant used in Caterpillar Diesel Engine cooling systems must meet “ASTM D6211-98a
Fully-Formulated Propylene Glycol-Based Engine Coolant for Heavy-Duty Engines”. When Propylene glycol is used in
heavy-duty diesel engines, regular addition of Supplemental Coolant Additive (SCA) is required for liner cavitation
protection. Consult your Caterpillar dealer for more information.
NOTICE: Do not use propylene glycol in
concentrations that exceed 50 percent glycol
because of propylene glycol’s reduced heat
transfer capability. Use ethylene glycol in
conditions that require additional protection
against boiling or freezing.
NOTE: Use a mixture that will provide protection against the lowest ambient temperature.
NOTE: 100 percent pure glycol will freeze at a temperature of -23°C (-9°F).