Withdrawal
1. Remove suction hose and PCV valve.
2. Remove the toothed belt cover.
3. Remove the rocker cover.
4. Loosen flange bolts, remove rocker shaft, rocker arms, rocker shaft spring assembly.
5. Remove the bolts, rocker arms, rocker shaft springs from the shaft.
Examination
Rocker arms
1. Check roller rotation. If it does not rotate smoothly or if it is worn, replace it.
2. Check the surface of the rocker arms. Replace if damaged or deformed.
3. Check if the surface of the hydraulic lash adjuster is in contact with the valve stem. Replace the compensator if worn or damaged.
Rocker shaft
1. Check rocker shafts for damage? Replace if necessary.
2. Check if the oil hole is blocked.
Automatic gap compensator
1. Insert the air vent wire into the auto compensator hole and move the plunger up and down 4-5 times.
2. Remove the bleed wire and move the plunger with your finger.
If the plunger moves even slightly, repeat steps. 1 and 2. If the plunger moves even after repeated repetition of paragraphs. 1, 2, replace the automatic gap compensator.
Warning. Do not attempt to disassemble the automatic gap compensator. Use clean oil to clean it.
Leak test of hydraulic gap compensator
1. Install the hydraulic gap compensator in the special tool (09246-32300), as it shown on the picture.
2. After the plunger has slightly lowered, measure the subsequent rate of descent.
The standard value of the sink rate is 20-50 seconds / 2.5 mm
(Diesel oil No. 2 or equivalent) — Temperature 27°С
3. If a leak test cannot be performed, check the compensator as follows.
- 1) Check if there is any abnormal noise when the engine is idling at normal operating temperature.
- 2) If the noise is abnormal, bleed the air from the automatic air gap adjuster.
- 3) After releasing the air, check for any abnormal noise when the engine is idling at normal operating temperature.
- 4) If the noise is still abnormal, replace the automatic hydraulic lash adjuster.
Installation
1. Install the rocker arms and rocker shaft springs onto the rocker shaft. Install the rocker shaft to the cylinder head.
Tighten the rocker shaft mounting bolts to the required torque.
Tightening torque: Rocker shaft mounting bolt - 20-24 Nm
2. When installing rocker arms, shafts, springs, pay attention to the difference between type A and B rocker arms. Only type A rocker arms are installed on the exhaust side. (See the picture above at the beginning of that section).
3. Install the rocker arm cover and tighten the bolts to the required torque.
Tightening torque: Rocker cover bolt - 8-10 Nm
Warning:
1. Grease must be applied to the top surface of the cylinder head and cover. The application surface is shown in the figure.
2. It is necessary to apply a certain amount of lubricant to prevent leakage.
3. Use special grade grease or equivalent Three bond N1212D aluminum color or equivalent.
4. Install the toothed belt cover.
Tightening torque: Timing belt cover bolt - 10-12 Nm
5. Install the air cleaner.
6. Install suction hose and PCV positive crankcase breather hose.