Withdrawal
1. Using a special tool to compress the valve springs (09222-28000, 09222-28100), remove the cracker. Next, remove the upper valve spring plate, valve spring, lower plate and valve.
Note. Save these dividers in the order in which they are to be placed in their original positions.
2. Use pliers to remove the sealing cap (don't reuse it).
Examination
Valves
Check each valve for wear, damage, broken head and stem in zone B. Repair or correct if necessary. If end A of the rod is worn out, resurface it. This direction should be minimal. Restore also the surface of the working chamfer of the valve. If the height of the valve edge is less than the allowable limit, replace the valve.
Valve springs
1. Check the length of the spring in the assembled state and its extension. If it exceeds the allowable limits, replace the spring.
2. Check the parallelism of the ends of each spring. If it exceeds the specified limits, replace the spring.
Valve bushings
Check clearance between valve stem and bushing. If it exceeds the specified limits, replace the valve bushing with the next size bushing.
Valve seat
Check the valve seat for signs of overheating and proper contact with the valve face. Repair or replace the valve seat if necessary.
Before repairing the seat, inspect the valve liner for wear. If the bushing is worn, replace it and then repair the seat. Repair the valve seat using a valve seat grinder or cutter.
Valve seat replacement procedure
1. An excessively worn valve seat should be replaced after cutting off most of the seat wall using a valve seat grinder as shown.
2. After removing the seat, use a reamer or cutter to machine the seat hole. Processing is carried out to the size indicated in the table.
3. Heat the cylinder head to about 250°C and press in the oversized seat.
Valve Sleeve Replacement Procedure
The valve sleeve is installed with a press fit. Using the device for installing valve sleeves. (09221-22000) or a suitable tool, replace the valve sleeve in the following order:
1. Using the valve stem installer pusher, use a press to push the valve stem toward the cylinder block.
2. Machine the valve sleeve hole in the cylinder head to fit the oversized new valve sleeve.
3. Using a valve seat installer or appropriate tool, press the valve seat into a press fit. When using a device for installing valve bushings, it is possible to press the valve bushing to a predetermined height. The valve sleeve must be installed from the top of the cylinder head. Keep in mind that the intake and exhaust valve bushings have different lengths (42.7 mm for intake valve and 39.1 mm for exhaust valve).
The oversized seat must be at normal room temperature before installation. After installing a new seat, treat its surface as just indicated above.
4. After installing the valve bushings, insert new valves into them And check the gap between them.
5. Each time the valve stems are replaced, check the nature of the contact between the valve and the seat and, if necessary, restore the surface of the seat.
Installation
Note:
1) Clean all parts before assembly.
2) Use engine oil to lubricate rotating and sliding parts.
1. After installing the lower spring plate, press the sealing cap onto the valve sleeve. To install it, fit the cap by slightly rotating the valve sealing cap installer (09222-22000).
The sealing cap is installed in the desired position with a special tool. If the sealing cap is not positioned correctly, the eccentric location of the protrusion, its internal hole and oil leakage into the valve sleeve are possible. Do not rotate the cap when installing. Do not use old sealing caps.
2. Apply engine oil to each valve. Insert the valves into the sleeves without forcing the valve stem through the sealing cap. After installation, check that the valve can move freely.
3. Install the valve springs and their upper plates. The valve springs must be installed with the varnished side towards the top plate.
4. Using a valve spring compressor (09222-28000; 09222-28100), compress the spring. Be careful not to deform the top of the dish with the sealing cap. Then install crackers. After installing the valves, make sure that the cotters are correctly installed.
5. Install the cylinder head.