Figure 17. Current Valve Guide Oil Seal
5. Install the valve springs and valve spring caps.
6. Thread the valve spring compressor J 7455 into one of the rocker shaft boltholes in the cylinder head (Fig.
7. Apply pressure to the free end of the tool to compress the valve spring and install the two-piece tapered
valve lock. Exercise care to avoid scoring the valve stem with the valve cap when compressing the spring.
If valve guide oil seals are used, compress the valve spring only enough to permit
installation of the valve locks. Compressing the spring too far may result in
damage to the oil seal.
8. Release the tool and install the valve locks on the remaining exhaust valves in the same manner.
9. Check the position of the exhaust valve (Fig. 13).
10. Support the cylinder head at each end with woodblocks and remove the masking tape so that the
exhaust valves are free. Then give the ends of the valve stem a sharp tap with a plastic hammer to seat the
valve locks. This will aid in the proper seating of the valve locks and reduce the chances of failure.
11. With the exhaust valves installed in the cylinder head, use spring checking gage J 25076-01 and note
the gage reading the moment the exhaust valve starts to open (Fig. 18). The minimum pressure required to
start to open the exhaust valve must not be less than 33 pounds for a two-valve cylinder head or 25 pounds for
a four-valve cylinder head.
12. Install the injectors, rocker arms, shafts, brackets, and any other parts that were previously removed
from the cylinder head.
13. Install the cylinder head. Refer to Preinstallation Inspection and Install Cylinder Head.
14. Perform a complete engine tuneup.