- A) If the amount of oil in the crankcase is insufficient, then air enters through the oil intake strainer into the lubrication system channel.
- b) If the amount of oil is more than normal, the oil foams excessively when the crankshaft rotates, and a large amount of air is mixed into the oil.
- V) When oil ages (oil has lost its properties - degenerated), the air mixed into the oil cannot be easily separated from it, and its amount in the oil is constantly increasing.
Attention: if there is a large amount of air in the oil due to one of the above reasons, and it enters the high pressure chamber of the hydraulic compensator, the air inside the hydraulic compensator is compressed when the valve is opened and the hydraulic compensator is also compressed (plunger "sag"), resulting in an abnormal noise when the valve closes. That is, the same thing happens when a too large thermal gap is set in the valve train drive by mistake. If you remove the air from the cavities of the hydraulic lifters, their work is restored.
2. To assess the condition of the hydraulic lifters, perform engine diagnostics (see table "Checking hydraulic lifters on a car".
3. If a deviation from the norm is found in the operation of the hydraulic lifters, then remove the camshafts and remove the hydraulic lifters to check (see section "Replacing the cylinder head gasket").
4. Checking hydraulic lifters after removal.
fix the surface "A" hydraulic compensator filled with engine oil, and press the stop "IN" hydraulic compensator by hand. If emphasis "IN" moves, replace the hydraulic lifter.
Table. Checking the hydraulic lifters on the car.
