The service life of the engine depends on the timely and thorough lubrication, as well as on the grade and quality of the oils and greases used

To avoid the penetration of dirt into the mechanisms, carefully clean the lubrication points and wipe the oilers.

Checking the oil level

Control the oil level according to the marks of the oil level indicator, not earlier than five minutes after stopping the engine, having installed the machine on a flat horizontal platform, to control, unscrew the indicator from the threaded part of the tube, wipe its rod with a clean rag and insert it into the tube, do not screwing in, then remove the pointer a second time (Fig. 1) and check the oil level.

If the oil level is close to the "H" mark, add fresh oil of the same brand to the "B" mark.

Checking the YaMZ diesel oil level

Oil change

To remove deposits from the crankcase along with oil, drain the oil from a warm engine, observing safety measures.

To drain the oil, unscrew the drain plug on the crankcase and remove the oil filler cap after cleaning it of dust and dirt. After completely draining the oil, tighten the plug.

Pour oil into the engine through the neck on the cylinder head cover.

Before filling, clean the neck from dust and dirt, check the tightness of the oil sump drain plug:

- tightening torque 140-160 Nm (14-16 kgcm).

Pour oil from oil dispensers with dosing guns, and in the absence of dispensers - through a funnel with a net of clean filling dishes. Close the lid.

Oil filter maintenance

Unscrewing the YaMZ engine filter cap YaMZ oil filter

Unscrew the filter cap by 3-4 turns and drain the oil through the housing channel into a container. To unscrew the cap, you can use the key, as shown in fig. 2.

Unscrew completely and remove cap 5 (Fig. 3) of the filter

Press the lock cover 3 and, sinking it into the cap 5 by 2-3 mm, turn it by 45°, after which it will disengage from the cap flange.

Remove the lock cover and filter element 4 from the cap.

Rinse the inside of the cap with diesel fuel. Cleaning is not allowed even with a clean cloth.

Install a new filter element into the cap with the rubber gasket facing out.

Insert the lock cover into the gasket hole, ensuring the correct position of the gasket.

Pressing the locking cover, sink it together with the element into the cap and turn it by 45°. The protrusions of the cap flange will enter the grooves of the cover, after which the spring will press the cover into the working position.

Screw the cap with the element onto the housing fitting 1 and tighten to 20-40 Nm (2-4 kgcm).

With the engine running, make sure there is no oil leakage from the cap seal. After four replacements of the filter element, replace the seal 2.

Flushing the centrifugal oil filter

Flushing the centrifugal oil filter

1. Unscrew the nut of the filter cap (Fig. 4) and remove the cap

Flushing the centrifugal oil filter

Unscrew the rotor mounting nut; remove the rotor with thrust washer 9 (Fig. 5)

  • 3. Disassemble the rotor, for which unscrew the nut 8, remove the washer 7 and the cap 6 of the rotor.
  • 4. Remove deposits from cap 6 and rotor 5 and wash them in diesel fuel.
  • 5. Assemble the filter in reverse order, checking the condition of gaskets 2 and 4, rotor nozzles 3 and washer 12. If necessary, replace the gaskets and clean the rotor nozzles.

Removing and flushing the valves of the lubrication system

If the pressure reducing valve or the differential valve of the lubrication system may jam, they must be removed by unscrewing the mounting bolts.

Rinse valves in diesel fuel without dismantling and reinstall. In case of malfunctions (spring breakage, etc.), replace the valve assembly.

Lubricating the compressor drive tensioner pulley bearings

Regularly fill the bearing cavity of the compressor drive tensioner pulley with grease in accordance with the lubrication table.

Inject the lubricant with a mechanical or manual grease gun through a grease fitting (Fig. 6) located on the pulley axis from the side of the cylinder block until grease appears through the stuffing box on the rear end of the pulley (4-5 strokes when filling with manual syringesm).

Lubricating Compressor Drive Idler Pulley Bearings

It is recommended to flush the tensioner bearings once a year in the following order:

  • 1. Unscrew the nut securing the tensioner pulley axle and the nut of the tensioner bolt.
  • 2. Unscrew the tensioner bolt from the pulley axle and remove the pulley with the axle.
  • 3. Unscrew the three bolts and remove the pulley cover.
  • 4. Remove the old grease from the pulley (without disassembling it) and wash it in kerosene or diesel fuel.
  • 5. Apply grease to the bearings and cover cavity and replace the cover.
  • 6. Install the pulley with the axle in place, put on the belt, adjust the belt tension and tighten the axle nut and locknut.
  • 7. Fill the bearing cavity with grease through the grease fitting until grease appears through the oil seals at the rear end of the pulley.