Off Vehicle Service

REMOVAL - CYLINDER HEAD OFF
1. Using Special Tool C-3422-D (valve spring compressor) with Adapter 6526 compress valve spring and remove valve retaining locks.
2. Slowly release valve spring compressor. Remove valve spring retainer and valve spring.
3. Remove valve stem seal assembly.

INSPECTION





When valves have been removed for inspection, reconditioning or replacement, valve springs should be tested (Fig. 50). As an example; the compression length of the spring to be tested is 38.00 mm (1.496 in.). Turn table of Tool C-647 until surface is in line with the 38.00 mm (1.496 inches.) mark on the threaded stud and the zero mark on the front. Place spring over stud on the table and lift compressing lever to set tone device. Pull on torque wrench until ping is heard. Take reading on torque wrench at this instant. Multiply this reading by two. This will give the spring load at test length. Fractional measurements are indicated on the table for finer adjustments. Refer to Specifications to obtain specified height and allowable tensions. Replace springs that do not meet specifications.

INSTALLATION - CYLINDER HEAD OFF
1. Install valves if removed.





2. Install valve stem seal/spring seat assembly over valve guides on all valve stems (Fig. 52). Ensure that the garter spring is intact around the top of the rubber seal.
3. Place valve spring (color-coded end facing up) and valve retainer into position.





4. Compress valve spring with valve spring compressor. Install locks and release tool. If valves and/or seats are reground, measure the installed height of springs (B) (Fig. 51), make sure measurements are taken from top of spring seat to the bottom surface of spring retainer. If height is greater than 38.75 mm (1.5256 in.), install a 0.762 mm (0.030 in.) spacer in head counterbore under the valve spring seat to bring spring height back within specification.