Basic aim of preparing this resentationwas to update all employees mainlyoperators who are practically involvedin engine operations on site or whilemobilising the cranes ,also coveringreasons,why the engine of LTM 1140crane seized while being mobilize fromDelhi to Rajasthan in the month of Mar
ENGINES:-This is a typical Mercedez Benz enginefitted on maximum no of cranes
While the crane was beingmobilized from Delhi and had justcompleted 100 kms of running, thehigh engine water temp indicationshowed maximum,and engineseized.
Following can be the reasons for high coolingwater temperature:-1. Overheating of cooling water.2. Less water in cooling tank/Radiator.3. Radiator fan not working.4. No coolant in water.5. Thermostat malfunction.6. Cooling water pump not working.
Now it can be seen fromthe working model, howmuch of heat will becreated due to friction allaround the engine andespecially around wall ofthe piston and surroundingareas.The Nos.1,2,3,4 areindicatingsuction,compression,powerand exhaust strokes.
If this heat is not removed oncontinuous basis it can damage following….. PISTON
LINNER (In which piston moves up and down andshown in red is the crankshaft which holds pistons with the help of connecting rods)
In this case both piston and cylinder are damaged
Line Diagram showing cooling water flow in Engine Thermostat Radiator Water flow Cylinder Head Water jacket inside engine body Exhaust Cylinder Block Oil cooler Piston Water Pump Oil Sump
After the engine was opened inworkshop it was noticed that thewater cavities were also rustedbecause there was no coolant inwater,photos are shown in nextslide marked with red circle…
Cooling water cavities in cylinder headWater pump casing Water Pump
Importance of coolant in coolingwater:-1. It has additives in it which does notallow the corrosion to take place.2. It has a property of keeping thecooling water temp low by few degreesthan normal water.
DAILY CHECKS ON AN ENGINE:-1. Check radiator water filling cover should be tight.2. Check water level in radiator ,It should be full.3. Check color of water for coolant/additives.4. Check water should not be dirty.5. Check engine oil level on dip stick.6. Check engine visually for any leaks ofwater,fuel,oil.7. Check tightness of all belts.8. Hand turn the engine for checking the free ness.
9. Check water level in battery.10. Check oil level in reservoir.11. Check tyre pressure.12. Check condition of all hoses.13. Start the engine and then check forany leaks.14. Check color of the exhaust it shouldnot be black or white,it should be colorless.
NORMAL RUNNING PARAMETERS OF AN ENGINE:-1. Fresh water temperature: 40 to 80 degreecentigrade2. Lub oil temperature 40 to 80 degree centigrade3. Lub oil pressure 2 to 4 kgMaximum Alarming Temperatures:-1. Fresh water temperature: 90 degree centigrade2. Lub oil temperature 95 degree centigrade3. Lub oil pressure 2 kg Minimum
Thanks &wish you all safe engineering practices
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