Maintenance Tips for Diesel Engine

May. 23, 2017

Proper maintenance of diesel engine, especially preventive maintenance, is the easiest and most economical maintenance. Besides, it is also the key to prolong the service life and reduce the cost.

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Here are our useful tips to keep your diesel engine

Daily Maintenance

Inspection items	Operation method
Check the fuel quantity in fuel tank	Observe the fuel level in fuel tank, add enough amount if necessary.
Check the oil level in oil pan	The oil level should reach the mark on the oil dipstick. If it is not sufficient, you should add to the specified amount.
Check the oil level of the fuel injection pump governor	The oil level should reach the mark on the oil dipstick. Add enough amount if necessary.
Check the leaks (water, oil, and gas)
Check the installation of diesel engine accessories	Including the stability of the accessories installation and the reliability of the connection between the foundation bolt and the machine.
Check the instrument	Observe whether the instrument reading is normal or not. If it is not normal, repair or replace it timely.
Check the fuel injection pump transmission connection plate	Whether the connection screw is loose or not, if it is loose, proofread the fuel injection advance angle and tighten the fitting screw.
Clean diesel engine and auxiliary instrument	Use the rag that has been soaked with diesel fuel to wipe off the oil stain, water and dust on the surface of the engine body, turbocharger, cylinder head cover, and air filter. And use compressed air to blow off the dust on the surface of charging generator, radiator and fan and so on.

Monthly Maintenance (One month)

Inspection items	Operation method
Check the battery voltage electrolyte specific gravity	Use the hydrometer to measure the electrolyte specific gravity. When the ambient temperature is below 20℃, the specific gravity should not be less than 1.27. Meanwhile, the liquid level should be higher than 10-15mm of the counter electrode. If it is insufficient, it shoul be filled with distilled water.
Check the tension degree of the triangle rubber belt	Similar to the belt tension adjustment method, check and adjust the degree of tightness of the belt.
Clean the oil absorption coarse strainer of the oil pump	Open the engine body large window cover, pull open the coarse strainer spring locking pieces, and remove the strainer, then place them into the diesel fuel and clean them.
Clean air filter	For the inertia oil bath type air filter, you should clean the steel wire core and replace the engine oil. For basin (cyclone) type air filter, you should clean the dust on the dust collection plate and maintain the paper filter element.
Clean the filter element inside the ventilation pipe	Remove the filter element from the engine body door cover plate, then put it into the diesel fuel or gasoline and clean it.
Clean the fuel filter	Remove the filter element and the shell in every 200 hours, and then clean them in diesel fuel or kerosene, or change the core, meanwhile, you should exclude the water and sediment.
Clean the oil filter	Generally, do this step in every 200 hours. 1) Clean the wound rotor type coarse filter element. 2) For the scraping blade filter, turn the handle to clear the oil contamination on the surface of the filter element, or put it into the diesel fuel and wash it.
Clean the oil filter and oil inlet of the turbocharger	Put the filter element and tube into diesel fuel or kerosene and clean them, and then dry to prevent dust and sundries contamination.
Change the oil in the oil pan	According to the use of the machine oil (oil contamination and viscosity reduction), you should change once every 200 to 300 hours.
Filling lubricating oil or grease	For all the oil nipple and mechanical tachometer joints, filling the prescriptive lubricating grease or machine oil.
Clean cooling water radiator	Pour the clean water into the radiator and remove the precipitate until it is clean.

Half a Year Maintenance (Six month)

Diesel engine 2^nd-class maintenance refers to the cumulative work 500h or regular maintenance every six months. The maintenance parts include injector, fuel injection pump, water pump, valve, radiator and fuel injection plug, etc.

Inspection items	Operation method
Check the injector	Check the fuel injection pressure, observe the spray and do the necessary cleaning and adjustment.
Check the fuel injection pump	Readjust it if necessary.
Check the valve clearance and fuel injection advance angle	Adjust if necessary.
Check the intake valve, exhaust valve and sealing condition	Remove the cylinder liner, observe the sealing and wear condition of the conical surface. If necessary, repair it timely.
Check the water pump leakage	If there is water leakage, you should exchange the water seal ring.
Check the water seal ring of cylinder liner	Remove the large window cover of the engine body, check whether there is water leakage, otherwise, remove the cylinder liner and exchange the new rubber sealing ring.
Check the fuel injection plug on transmission cover plate	Remove the front cover, check whether the spray orifice of the fuel injection plug is smooth. If there is something blocking, you should clean it timely.
Check the cooling water radiator, engine oil radiator and cooler	If there is water leakage and oil leakage condition, you should do the necessary repair.
Check the strudy condition of the main parts	Check the connecting rod screw, crankshaft nut and cylinder head nut. Remove and retighten it to the specified torque if necessary.
Check electrical equipment	Whether the wire joint is connected, it should be replaced if there is burning loss.
Clean oil and fuel system piping	Including the cleaning of oil pan, oil pipe, oil cooler, and fuel tank piping.
Clean the cooling system piping	Use per liter 150g sodium solution to fill up the diesel engine cooling system, and then start the diesel engine after staying 8-12h. When the water temperature is above 75℃, remove the cleaning liquid and then clean the cooling system with clean water.

Inspection items	Operation method
Check cylinder head assembly	Check the wear condition of the valve, valve seat, valve shaft guide, valve spring, push rod and rocker arm fitting surface. If necessary, polish or replace them.
Check piston connecting rod components	Check the wear condition of the piston ring, cylinder liner, connecting rod bushing and connecting rod bearing shell. Replace them if necessary.
Check crankshaft components	Check the wear condition of thrust bearing and toggle plate, whether there iscircumferential flow phenomenon in the rolling main bearing inside and outside circle. Replace them if necessary.
Check the transmission mechanism and valve timing	Check the valve timing, observe the wear condition of the transmission gear mating surface and measure the meshing clearance. Repair or replace it if necessary.
Check fuel injector	Check the injector spray, grind and replace the nozzle mate parts if necessary.
Check fuel injection pump	Check the sealing of the plunger matching parts and the wear condition of the flying iron pin. Replace it if necessary.
Check turbocharger	Check the clearance between the impeller and the shell, the wear condition of floating bearings, turbine rotor, air seal and oil seal and other parts. Repair or replace it if necessary.
Check oil pump and fresh water pump	Overhaul, measure and adjust the easily-worn parts.
Check cylinder head, intake and exhaust pipe gasket	For the damaged or lose the seal function ones, you should replace them.
Check charging generator and starting dynamo	Cleaning the parts and bearings, fill with new lubricating grease after drying. Then check the wear condition of the starting motor gear and the rotation device is flexible.