The engine lubrication system is designed to supply cooled and purified oil to the rubbing surfaces of the engine, remove heat and wear products from them

Scheme of the engine lubrication system is shown in fig. 1.

Scheme of the lubrication system of a diesel car Ural

The oil filter 20 is attached with three bolts to the right wall of the cylinder block.

The centrifugal oil filter 4 is installed on the front cover of the cylinder block on the right side of the engine.

The oil pump is located in front of the oil sump cavity and is attached with three bolts to the engine block, the dismantling of these units was described above.

When disassembling the oil pump unscrew the bolts and remove the suction and supply pipes.

Oil pump drive driven gear puller and gear compressor drive I-80.02.00

Using puller I-80102.000 (Fig. 2), press gear 1 (Fig. 3). When installing, screw the puller bolts into the threaded holes A of gear 1. Remove the key 2 from the shaft 31.

Ural diesel oil pump parts

Unscrew plugs 20, 21 and 23, remove gaskets 19 and 25. Remove adjusting washers 18 and 26 from plugs 20 and 23.

Remove valve springs 17 and 28, valves 16 and 34, valve 22 of the lubrication system, shims 24 and spring 27 from housings 3 and 13.

Unlock and unscrew two bolts 15 from the side of the body 13 and two bolts 37 from the side of the body 3, remove the lock washers 14 and 36.

Separate housing 13 from spacer 9 and remove it complete with gear 12 and axle 11.

Remove gear 12 from housing 13.

Remove gear 30, key 32 and spacer 9 from roller 31.

Remove roller 31 complete with gear 33, gear 7 complete with bushings 8 from housing 3.

If necessary, press axle 11 out of housing 13, and roller 31 out of gear 33 and remove the key.

Do not press out mounting sleeves 6 and pins 5 without the need. to clean the oil channels in housings 3 and 13 with a key (with 5 and 8 mm hexagons), unscrew the plugs 4, 35, etc.

In case of wear or damage, press bushings 29, 38 and 8, 10 out of the housings and gears.

Assemble the oil pump in the reverse order of disassembly. In this case, a number of requirements must be met.

Do not reuse lock washers 14 and 36 during assembly.

In the assembled pump, the rotation of the roller 1 behind the gear 1 should be free, without jamming.

Repair and replacement of worn parts should be provided at the interfaces of the main parts.

When pressing axle 11 into housing 13, ensure that the axle protrudes from the housing split plane by 47 ± 0.2 mm.

Oil pump cut

After assembly, check the supply of the oil pump on the stand using engine oil M10G2k at a temperature of 80-85 ° C.

When checking, adjust valves 9, 13 and 14 (fig. 4).

When checking the pump, the drive shaft should rotate at a frequency of 2750-2800 rpm.

The vacuum in the suction tract of the pump should be 90 -110 mm Hg. st.

When tested under these conditions, the feed should be:

  • - at the injection section (at outlet pressure 3.5—4.0 kgf/cm2) at least 82 l/min;
  • - at the radiator section (at outlet pressure 7.0—7.5 kgf/cm2) at least 27 l/min.
  • - adjust the opening pressure of valves 9, 13 and 14, respectively, with packages of shims 11, 12 and 15.

The start of opening valve 13 of the lubrication system should be at an oil pressure in channel F of 4.0-4.5 kgf/cm2.

The start of opening of the safety valves of the discharge section (channel D) and the radiator section (channel N) should be at an oil pressure of 8.5—9.5 kgf/cm2

.Ural car oil filter

To disassemble the oil filter (Fig. 5), unscrew the rods 5 and remove the caps 6 from the body 2.

Remove sealing ring 3 only when replacing.

Unscrew the plug 13, remove the sealing gasket 12 and shims 14, remove the spring 16 from the hole in the housing, the signaling device housing 18 as an assembly with the moving contact 17 and the bypass valve 20.

Remove ring 7, sealing cup 8, spring 10 from rod 5, remove the rod from the cap, remove the sealing gasket from it. To clean the oil channels, unscrew the plugs.

Assemble the oil filter in the reverse order of disassembly.

After assembly, in order to assess the technical condition of sealing rings 3 and 9, check the tightness of the filter with an air pressure of 5 kgf/cm2 by lowering it into water at a temperature of 60˚C. apply air pressure through the inlet.

In case of leakage, replace the rings with new ones.

Check and, if necessary, adjust with washers 14 the pressure to start opening the bypass valve 20 and the pressure to turn on the clogged filter indicator (by the control light comes on).

The moment of opening the valve is determined by the beginning of the flow of oil from the hole behind the valve.

The adjustment is considered correct (when using no more than three shims) if the pressure in the N cavity at the beginning of the valve opening is 2.5-3 kgf/cm2.

If the opening pressure of the bypass valve is not correct, replace the valve spring.

Check the operation of the filter element clogging indicator light sensor in an electrical circuit with a voltage of 12-24 V.

The closing of the circuit between the movable 17 and the fixed 15 contacts (lighting of the bulb) should occur at an excess pressure in the N cavity, equal to or less than the pressure at the beginning of the opening of the bypass valve, but not lower than 2 kgf/cm2.

It is more convenient to disassemble the centrifugal oil filter when it is installed vertically on a stand or in a vise.

To disassemble, unscrew the four bolts (being careful not to damage the gasket), separate the filter from the front cover of the cylinder block and install it on a bench or secure it in a vise.

Oil centrifugal filter

When disassembling, unscrew the nut 12 (Fig. 6), the gasket 13 and the cap 7 of the filter.

Turn the cap of the rotor 5 so that the pins 18 of the stopper enter the holes on the bottom of the rotor 6.

Unscrew nut 11 and remove rotor cap 5 together with nut 11.

Unscrew nut 10, remove washer 9, bearing 8, rotor 6 as an assembly, stopper plate 19, pin 18 and spring 20.

If necessary, unscrew axle 15 and remove tube 2. Unscrew plugs 25 and 27, remove gaskets 28, 26, adjusting washers 24 and 28, remove springs 22 and 29, valves 21 and 30.

Reassemble the filter in the reverse order of disassembly. Tighten axle 15 (tightening torque 30—35 kgf/m).

Install bearing 8 so that the ring with the enlarged inner diameter is at the bottom.

The marks on cap 5 and rotor 6 must be aligned with an accuracy of 5 mm (otherwise, the balance of the rotor with cap assembly will be disturbed).

After assembly, check and, if necessary, adjust with washers 24 and 28 the pressure at which the valves begin to open.

The bypass plunger 21 must open at a pressure in the channel of 6.0 - 6.6 kgf/cm2.

Drain valve 30 must open at a pressure in the "B" channel of 1.1-1.2 kgf/cm2.

Oil cooler rinse first in hot 10% caustic soda solution, then in hot water.

The degreasing solution and water during flushing must circulate in the opposite direction to the oil and air flows.

After flushing, check the radiator for tightness with air under a pressure of no more than 4 kgf / cm2 (with immersion in water). In case of a leak, repair the radiator, solder the leaks with soft solder.

Fix cracks in the frame by gas welding, followed by cleaning of the weld and painting.