Combined diesel lubrication system

Oil pump - gear type, single-section

Lubrication system diagram: 1 - oil sump; 2 - piston cooling nozzles; 3 - crankshaft; 4 - camshaft; 5 - intermediate gear; 6 - oil filler neck; 7 - oil sump plug; 8 – oil receiver; 9 - oil pump; 10 - liquid-oil heat exchanger (LHT); 11 - bypass valve; 12 - oil filter; 13 - bypass valve; 14 - safety valve; 15 - pressure sensor; 16 - turbocharger; 17 - compressor; 18 - high pressure fuel pump; 19 - oil channel of the rocker axis

The oil pump is driven by a gear mounted on the crankshaft.

The oil pump 9, through the oil receiver 8, takes oil from the oil sump 1 and supplies it through the channels in the cylinder block and the channels of the oil filter housing to the liquid-oil heat exchanger 10, and then to the full-flow oil filter 12 and to the diesel oil line.

From the main diesel line, oil flows through channels in the cylinder block to all crankshaft main bearings and camshaft journals.

From the main bearings, oil flows through channels in the crankshaft to all connecting rod bearings.

From the first main bearing, oil flows through special channels to the bushings of the intermediate gear and the fuel pump drive gear, as well as to the fuel pump.

Valve mechanism parts are lubricated with oil supplied from the rear camshaft bearing through channels in the block, cylinder head, drilling in the “IV” rocker arm post into the internal cavity of the rocker arm axis and through a hole in the rocker arm bushing, from which it goes through the channel to the adjusting screw and a barbell.

Oil is supplied to the compressor from the main line through drillings in the cylinder block and a special oil pipeline. The oil is drained from the compressor into the diesel crankcase.

Oil is supplied to the bearing assembly of the turbocharger through a tube connected at the outlet of the oil filter housing.

From the bearing assembly of the turbocharger, oil is discharged through a tube into the oil sump

Bypass (reducing) valves are installed in the housing of the liquid-oil heat exchanger - 11 (response pressure value - 0.15-0.20 mPa) and in the oil filter - 13 (response pressure value 0.13-0.17 mPa) .

When starting a diesel engine on cold oil, when the resistance to the passage of oil in the liquid-oil heat exchanger exceeds 0.15-0.2 mPa, the bypass valve opens and the oil, bypassing the liquid-oil heat exchanger, enters the oil filter, and when resistance in the oil filter is 0.13-0.17 mPa, the oil filter bypass valve opens and the oil, bypassing the oil filter, enters the oil line.

Bypass valves are unregulated.

An adjustable safety valve 14 is built into the filter housing, designed to maintain oil pressure in the main oil line at 0.25-0.35 mPa.

Excess oil is drained through the valve into the diesel crankcase.

In case of excessive clogging, when the oil filter resistance becomes higher than 0.13-0.17 mPa, the filter bypass valve also opens, and the oil, bypassing the oil filter, enters the oil line.

Attention! When the diesel engine is running, it is strictly forbidden to unscrew the pressure reducing valve plug!

Maintenance of the lubrication system consists of daily monitoring of the oil level in the engine crankcase, monitoring oil pressure, and timely changing the oil and filter.

Check the oil level daily before starting the engine and no earlier than 3 minutes after stopping the engine.

The bus must be installed on a flat, horizontal platform. The oil level should be between the lower and upper marks of the oil dipstick.

It is prohibited to operate the engine with the oil level below the lower and above the upper mark of the oil gauge.

The oil pressure of the engine lubrication system is controlled by an indicator located on the instrument panel. When the diesel engine is operating at rated frequency

rotation and coolant temperature (85-95) °C, oil pressure should be at the level of (0.25-0.35) MPa, the pressure value on a cold engine is allowed up to 0.8 MPa.

At minimum idle speed, the oil pressure in the lubrication system of a warm engine must be at least 0.08 MPa.

The oil is changed every 8,000 km. Oil changes are allowed after 10,000 km.

Attention! In the case of using backup oils or fuel with a high sulfur content, the oil should be changed after (4000-5000) km.

Double oils include: M-10 G2K and M-8 G2K.

The oil in the diesel crankcase is changed on a preheated engine.

To drain the oil, you need to unscrew the oil sump plug. After all the oil has flowed out of the crankcase, screw the plug back into place.

Fill diesel oil through the oil filler pipe to the level of the upper mark on the oil gauge.

Only fill the oil sump with oil recommended in this manual and appropriate for the period of operation.

The use of oils of other brands may lead to diesel malfunctions.

The oil filter is replaced simultaneously with the oil change in the engine crankcase and the diagnostic results of the "COMMON RAIL" system in the following sequence:

Oil filter: 1 - filter housing; 2 - liquid-oil heat exchanger (ZhMET); 3 - fitting; 4 - filter gasket; 5 - liquid metal gasket; 6 - anti-drainage valve; 7 - bypass valve; 8 - safety valve; 9 - plug for draining coolant; 10 - sealing ring; 11 - LMC safety valve

  1. Clean the interface between the oil filter and valve body 1 from dirt.
  2. Unscrew filter FM 009-1012005 or M5101 from fitting 3, using a special key or other available means.
  3. Wipe the mating surface in the valve body.
  4. Fill the new filter with clean oil and install (screw onto the fitting) the FM 009-101201 or M5101 filter assembly with gasket 4, which must first be lubricated with engine oil.
  5. After the gasket touches the filter housing cup, tighten the filter another 1-1.5 turns.

Installing the filter should only be done by hand

Instead of the FM 009-1012005 and M5101 filters, it is allowed to install non-separable type filter cartridges: mod. X149 from AC Lelko (France), mod. L37198 from “Purolator” (Italy) and other companies that have anti-drainage and bypass valves in their design with the main overall dimensions: - diameter - 95-105 mm; - height – 140-160 mm; - thread – 3/4-16UNF.

The safety (drain) valve is adjusted when the oil pressure in the engine lubrication system drops below 2.5 kgf/cm 2.

Adjustment should be carried out with the engine turned off and warm

Oil pressure adjustment: 1 - oil filter; 2 - liquid-oil heat exchanger; 3 - oil filter housing; 4 - pressure reducing valve plug; 5 - plug gasket; 6 - adjusting plug; 7 - screwdriver
  1. Unscrew plug 4 (Fig. 3), remove gasket 5.

In the channel of the oil filter housing 3, use a screwdriver 7 to turn the adjusting plug 6 one turn in the direction of increasing or decreasing the pressure value (depending on the actual pressure).

  1. Install gasket 5 and tighten plug 4.
  2. If necessary, repeat these adjustment steps.