Inspection
1. On engines with high mileage or on which maintenance has not been performed regularly (especially oil change), there is a possibility that the valve lifters are dirty inside. In the best case, this can result in increased noise and wear. To reduce the possibility of problems during engine operation, it is recommended to disassemble and clean the hydraulic lifters every time the cylinder head is overhauled. Please note that replacement parts for the lifters are not available, and if any of the components are unserviceable, the entire assembly must be replaced (see illustration).
2. After removing and disassembling the cylinder head as described in Chapters 21 and 23, first inspect the tappet seats in the head. If there is excessive wear, the head must be replaced. Also check that the tappet oil holes in the head are not clogged.
3. Starting with valve tappet #1, carefully remove the bearing from the top of the tappet cylinder. It may be possible to remove it by hand, but be careful not to distort the bearing.
4. Remove the plunger from the cylinder and remove the spring.
5. Using a small screwdriver, carefully remove the cap from the plunger base. Remove the spring and ball from under the cap, making sure not to lose them.
(Text copied from this portal OPELBOOK)
6. Carefully clean all components with kerosene or solvent, paying special attention to the treated surfaces of the cylinder (inside) and the piston (outside). Dry all components thoroughly with a thick (lint-free) cloth. Carefully inspect the springs for damage or deformation. If the springs are in poor condition, the pushrod must be replaced.
7. Lubricate the components with clean engine oil, then assemble the lifters as follows.
8. Turn the plunger over and insert the ball into the hole in the base of the plunger (see illustration).
9. Install the smaller spring into the seat in the plunger cap, then carefully install the cap with the spring, making sure that the spring rests against the ball. Gently crimp the flange of the cap around the perimeter, using a small screwdriver if necessary, until the flange is securely seated in the groove in the base of the plunger (see illustrations).
10. Install the large spring (correctly oriented) in the plunger cap, insert the plunger assembly with spring into the cylinder (see illustrations).
11. Place the bearing on the top of the plunger, gently squeeze the plunger with your hands until the bearing is securely locked into the groove of the cylinder (see illustration).
12. Repeat the above procedure with the remaining valve lifters.
Visitor comments