Valve Guide Seal: Service and Repair

DISASSEMBLY
1. Follow Procedure outlined in illustration, noting the following.








2. Remove the cylinder head bolts in sequence shown. Using the special tool, loosen the cylinder head bolt.
3. Loosen the cylinder head bolts in the order shown. Loosen bolts evenly little by little, taking several steps.

NOTE: Store removed valves, springs and other parts, tagged to indicate their cylinder No. and location for reassembly.





4. Using special tool, remove valve, springs and other parts.





5. Use pliers to remove the valve stem seal.

CAUTION: Do not reuse the stem seals.

ASSEMBLY
1. Follow disassembly procedure in reverse order, noting the following.
2. Install the valve spring seat.








3. Using the special tool, install a new stem seal to the valve guide.

NOTE: Improper installation can be a cause of leakage of oil down into the cylinder.





4. Install the valve spring so that its end with identification color is positioned on the rocker arm end.
5. Do not compress the valve spring excessively, or the bottom end of the retainer will damage the stem seal.





NOTE: When installing the cylinder head bolts, the length below the head of the bolts should be within (A): 99.4 mm (3.91 inch). If it is outside (A): 99.4 mm (3.91 inch), replace the bolts.

6. Apply engine oil to the bolt thread and the washer.





7. Tighten the bolts by the following procedure.
a. Tighten to 78 Nm (58 ft. lbs). In the order shown in the illustration.
b. Loosen fully in the reverse order of that shown in the illustration.
c. Tighten to 20 Nm (15 ft. lbs.). In the order shown in the illustration.

CAUTION:
1. Always make a tightening angle just 90°. If it is less than 90°, the head bolt will be loosened.
2. If it is more than 90°, remove the head bolt and repeat the procedure from step 1.





d. Mark the head of the cylinder head bolt and cylinder head with paint. Tighten 90° of a turn. In the order shown in the illustration.
e. Tighten 90° of a turn. In the order shown in the illustration. Check that the painted mark of the head bolt is lined up with that of the cylinder head.