Table of contents: Disassembly ↓ Assembly ↓
Disassembly
Attention! The manufacturer supplies new and repair cylinder heads to repair points as spare parts. Due to the fact that specialized tools are required for disassembly and inspection procedures, and spare parts are sometimes difficult to find, it seems more expedient to purchase a new cylinder head than to disassemble, inspect and repair a used head.
1. Remove the cylinder head.
2. Remove the intake and exhaust manifolds if these parts have not already been removed (see subsection 6.1.12 and subsection 6.1.13).
3. Remove the valve drive levers and hydraulic regulators.
4. Loosen the bolts and remove the cooling system pipes from the cylinder head.
5. Compress the first valve spring with a tool and remove the crackers. Carefully release the valve spring, remove the spring plate, spring and support washer. Remove the valve stem seals from the guide bushings with pliers.
6. If the valve spring retainer does not move away and release the crackers when the tool is compressed, lightly tap the tool directly above the retainer with a soft-faced hammer to make it easier to remove the retainer.
7. Remove the valve from the cylinder head on the combustion chamber side.
8. The valve should be stored with the cotters, spring, spring retainer and thrust washer. Valves should also be marked for reinstallation unless they show severe wear that requires replacement.
9. If the valves are to be reinstalled, place them in a separate plastic bag marked with the appropriate number. Note that valve N1 is located next to the timing chain cover.
Assembly
1. Install the spring support washer, then dip the valve stem seal into fresh engine oil. Carefully place the seal on the valve stem and onto the bushing. Be careful not to damage the seals when placing them on the valve stem.
2. Press the cap onto the guide sleeve using a mandrel.
3. Lubricate the valve stems with fresh engine oil and install the valves into their respective guides on the cylinder head in the same order as the original installation. New valves should be installed in the seats they were lapped into.
4. Place the spring on the support washer, orienting it so that the tightly wound spring coils are facing downwards.
5. Install the spring plate.
6. Compress the springs and insert the crackers into the groove on the valve stem. Release the valve spring and remove the device. Install the crackers of the remaining valves in the same way.
Caution: To hold the crackers in the valve grooves while removing the tool, secure the crackers by applying a dot of grease to them.
7. After installing all the valves, turn the cylinder head over and seat the valve train parts with light hammer blows through a wooden spacer on the stem of each valve.
8. Check the cleanliness of the cylinder head and coolant pipe joint surfaces. Apply a bead of sealant to these surfaces and install the pipe, tightening the bolts securely.
9. Now you can assemble the cylinder head with the rest of the parts.