Workshop Manual S3.8 Engine A030K288 (Issue 2) 01-2010 CLEANING OF COOLING SYSTEM Cummins strongly recommends the use of SAE 15W40 lub oil with API, CF4 classification for all Cummins engines to get the various advantages and optimum performance from the engine. Wait until the temperature falls below 50°C before draining. Draining procedure Drain the cooling system. Use a drain pan with a capacity of 20 litres. This oil should have a minimum TBN of 10.5. NOTE Prolonged and repeated contact with used antifreeze can cause skin disorders or other body injury.
Above limits are for reference only and exact applicable values can be obtained from the respective oil manufacturer against specific brand of oil. The responsibility of meeting oil quality lies with the oil manufacturer and Cummins will not be responsible for problems occurring on engines due to poor quality of oil. If in doubt about the lub oil quality, contact lub oil manufacturing company and get the oil analysed in laboratories. CAUTIONS Beware of spurious oils in the market. Bad quality of lubricating oil is detrimental to engine performances. Hence, oil should always be procured from the original manufacturer or the authorized distributors.
System flushing & filling Mix 0.5 kg of sodium carbonate with water for preparing flushing mixture. Fill the system slowly. Lubricating oil to be used on the engine must meet all the qualities as per manufacturer’s specifications. Cummins recommends audit checks of fresh engine oil to ensure the quality of oil. Facility to check suitability of oil for using it in the engine is available with Cummins Service Network. Do not intermix different brands of oil since two different brands may not be compatible with each other. It is therefore recommended that the brand which is used for initial fill, should only be used for top-up.
Wait 2 or 3 minutes to allow air to be vented and add mixture to bring the level to the top. Do not install the radiator cap. Operating procedure Operate the engine for 5 mins. with the flushing mixture temperature above 80°C. Shut the engine off and drain the cooling system. System filling However, in case of non-availability of specific brand, different brand of oil may be used at the time of oil change. In that case, drain all the existing oil and flush the lub oil system with new brand oil and then charge the system with new brand oil.
RECOMMENDATIONS Quality of Lubricating oil is one of the key drive factors to decide the performance, durability and total cost of operation of diesel engine. Hence we have always been recommending the best available/ suitable engine oil to be used in our engine. COOLANT RECOMMENDATIONS Cummins recommends, use of Premix Coolant, for engine cooling. This is ‘Ready to Use’ type Coolant & is available 27