Contents: Cleaning ↓ Examination ↓
Valve wear check locations
1. End face; 2. Grooves for crackers; 3. Rod; 4. Chamfer; 5. Inlet valve; 6. Belt; 7. Exhaust valve
Typical wear of the valve end
Cleaning
1. Remove all gasket residue from the head split surfaces, being careful not to damage the surfaces. Remove carbon deposits from combustion chambers, valve heads and scale from cooling passages. Clean and flush all threaded holes.
2. Wash all valve train parts with solvent, being careful not to damage them.
Examination
Head
1. Carefully inspect the head for cracks and signs of coolant penetration. If cracks are found, replace the head.
2. Check the deformation of the split surface of the head. If the deviation from the plane exceeds the norm, the head should be re-ground.
3. Check the condition of the valve seats. In the presence of pitting (pits), cracks, traces of burnout, you will need to repair the head in a car service station.
4. Check the valve play in the transverse direction (arrow). If half of the total play on the indicator exceeds the norm, then the bushing should be replaced (performed in a car service).
Valves
5. Inspect the valves carefully (cm. rice. Valve wear check points), check the valve faces for cracks, traces of uneven wear, metal loss and burnout. Check the necks and rods for cracks, as well as rod bending by turning the valve in the guide bushing.
6. Check the wear on the ends of the rods (see fig. Characteristic wear of the valve end). The presence of any of the above defects indicates the need for valve repair.
7. Measure the width of the edge band (1) of each valve and compare it with the standard value. If this distance is less than the standard, replace the valve.
Valve Mechanism Parts
8. Measure the length of the spring in a free state. Replace springs with shrinkage. Before installing springs on a repaired engine, they must be tested under load on a special stand in a car service center.
9. Check the verticality of the springs. If a spring deviation from the vertical is detected, the spring should be replaced.
10. Check for visible signs of wear and cracks on the spring plates and crackers. Replace parts with any defects.
11. If the inspection reveals that the wear of the parts does not exceed the norm, then assemble the cylinder head, installing the parts in their original places. Cylinder head repairs of any complexity should be performed at a car service center.