iv. Mechanical Failures Defective water pump, idler tensioner, damaged turbocharger, engine mounts or alternator can be a source of mechanical noise. Defect can be located by replacing alternator, water pump, engine mounts, and idler tensioner with a new one. Metallic knocking sound from an engine may be due to faulty injectors, excessive clearance in main and big end bearings, small end bush, HLA, piston slap, seizing of piston rings, scored cylinder bore or breakage of any moving parts. Overhauling of fuel system will set right Diesel Knock. Dismantling of engine may be considered if still noise occurs even after attending all above mentioned problems. Check for EMS problems if any. C. REGULAR MAINTENANCE ENGINE OIL AND FILTER CHANGE I. DESCRIPTION Change the engine oil and filter as per service schedule. If the vehicle is operated in sandy/dusty conditions, idled extensively, or subject to frequent short distance driving, change the engine oil and filter more frequently. PROCEDURE 1. Drive the vehicle so the engine oil is at normal operating temperature. 2. Raise the vehicle off the ground to access the oil sump drain plug and oil filter. Raise the vehicle with a lift hoist. • Park the vehicle on flat, level surface and • engage the parking brake. Place chocks at the rear wheels and raise the front of the vehicle with a floor jack. 3. Raise the vehicle bonnet/hood and remove the oil fill cap. CAUTION Always use the recommended grade and • quality of motor oil. Never use reclaimed oil as this may not • protect the engine components properly. NOTE To protect the environment, always recycle • or dispose of oil at the proper outlets. WARNING Engine oil will be hot. Contact with hot engine oil will cause bums. Use care when handling hot engine oil. Diesel Engine Ph-2 (CAFÉ) 51
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