MBE 900 OPERATOR'S GUIDE Coolant Concentration Checking NOTE: Check and correct the coolant level only when the coolant temperature is below 50°C (122°F). Check coolant concentration as follows: 2. Before adding coolant, use a suitable tester to check the concentration of corrosion-inhibiting antifreeze. If the concentration is lower than 50% by volume, drain coolant/add antifreeze until the concentration is correct. The coolant mixing ratio is listed in Table 29. HOT COOLANT To avoid scalding from the expulsion of hot coolant, never remove the cooling system pressure cap while the engine is at operating temperature.
Wear adequate protective clothing (face shield, rubber gloves, apron, and boots). Remove the cap slowly to relieve pressure. NOTE: Concentrations of more than 55% by volume should not be used, as this is the level which affords the maximum antifreeze protection, down to (–49°F). Higher concentrations adversely affect heat dissipation. 1. Open the cap on the surge tank slowly, to allow excess pressure to escape. Set the cap aside. Table 29 Coolant Mixing Ratio NOTICE: NOTE: When topping off, use only a pre-prepared coolant mixture containing a 50% concentration If the concentration of antifreeze is too low, there is a risk of corrosion or cavitation in the cooling system.
All information subject to change without notice. (Rev. 04/08) 91 DDC-SVC-MAN-0055 04/08 Copyright © 2008 DETROIT DIESEL CORPORATION Antifreeze Protection Down to°C (°F) Water Percentage by Volume Corrosion-Inhibiting Antifreeze Percentage by Volume –37 (–347) 50 50 –45 (–49) 45 Maximum 55