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2.2.2. Check of gaps in the mechanism of the drive of valves on engines M 102.980 and M 102.982


Principle of hydraulic compensation of a gap of valves

On engines M 102.980 and M 102.982 valvate yokes have hydraulic pushers.


Hydraulic pusher of valves

1 — the accumulative camera
2 — the working camera
3 — a pusher
4 — a yoke

5 — a returnable spring of the ball valve
6 — a plate of a pusher
7 — a persistent washer of a pusher

In accumulative 1 and the worker 2 cameras come to operating time of the engine oil under low pressure (no more than 3 kg/cm 2). Thereby the continuous contact of a pusher 3 with a valve core is provided. When raising a yoke the 4th cam the pusher enters in a yoke, the ball valve is closed that causes increase in pressure in the working camera. Owing to incompressibility of oil transfer to a pusher and the valve of the movement from a cam and a yoke is provided. The spring 5 provides the constant pressure of a pusher upon valves and at the stopped engine.


Check

If there are doubts in malfunction of pushers (knock, deterioration in operation of the engine), check their state.

 PERFORMANCE ORDER

  1. Uncover a head of cylinders.
  2. Turn a bent shaft of the engine manually so that the nape of a yoke was turned to a camshaft cam.
  3. Measure the pusher course against the stop in a yoke. If the course exceeds 0,5 — 2,4 mm, change thickness of a spherical plate 6 or a persistent washer of the 7th pusher.
  4. If one of pushers falls quicker, than others, then it should be removed and replaced.