Workshop Manual S3.8 Engine A030K288 (Issue 2) 01-2010 Oil Pressure before shutting it down to allow lubricating oil and water to carry heat away from the combustion chamber, bearings shafts etc. This is especially important with turbocharged engines. Normal engine oil Pressure at temperature 221 0 F (105 0 C) should be between 2.5 to 5 Kg/cm 2 at rated speed and 1 to 2 Kg/cm 2 at low idle speed. The turbocharger contains bearings and seals that are subject to the high heat of combustion exhaust gases. While the engine is running, this heat is carried away by oil circulation, but if the engine is stopped suddenly, the turbocharger temperature may rise above 360 0 F.
The results of extreme heat may be seized bearings or loose oil seals. Note : Please note that oil pressure will vary with temperature. Note : Individual engines may vary from above normal pressures. Observe and record pressure when engine is new to serve as guide for indication of progressive engine condition. (High oil pressure during start up is not a cause for alarm.) For record purposes these readings are more accurate and reliable when taken immediately after an oil change. Do Not Idle Engine For Excessively Long Periods Long periods of idling are not good for an engine because combustion chamber temperatures drop so low the fuel may not burn completely.
This will cause carbon to clog the injector spray holes and piston rings and may result in stucked valves. Engine Exhaust The engine exhaust is a good indicator of engine operation and performance. A smoky exhaust may be due to a poor grade of fuel, dirty air cleaner, overfueling or poor mechanical conditions. If engine exhaust is smoky, corrective action should be taken. If engine coolant temperature becomes too low, raw fuel will wash lubricating oil off cylinder walls and dilute crankcase oil so all moving parts of the engine will suffer from poor lubrication. Warning : Inhalation of exhaust gases can result in severe personal injury or death.
Use extreme care during installation to provide a tight exhaust system. Terminate exhaust pipes away from enclosed or sheltered areas, windows, doors and vents. If the engine is not being used, shut it down. Switch off the engine with the shut down coil provided on engine. Or The engine can be shut down by pulling down mechanical lever fitted on MICO pump. High Altitude Operation Some engines, particularly naturally aspirated, lose horsepower when operated at high altitude because the air is too thin to burn as much fuel as at sea level. This loss is about 5 percent for each 1800 ft. of altitude above sea level for a naturally aspirated engine.
Operate the engine using a lower power requirement at high altitude to prevent smoke and over-fueling. Radiator The radiator used on S-3.8-G engine are state of the art aluminium radiators. These radiators are with aluminium tubes & fins. The top and bottom tank are of moulded plastic material. These radiators do not have de-aeration cooling system. Warning : Do not remove the guarding when the engine is in working condition . Engine Shut-Down Idle Engine A Few Minutes Before Shut- Down It is important to idle an engine 3 to 5 minutes 13