Removal and Installation
INTAKE/EXHAUST VALVES & SEATSREMOVAL
NOTE: The cylinder heads must be removed in order to perform this procedure.
1. Remove rocker arms and lash adjusters. (Fig. 27).
2. Remove the camshaft bearing caps and the camshaft.
NOTE: All six valve springs and valves are removed in the same manner; this procedure only covers one valve and valve spring.
3. Using Special Tool C-3422-B or C-3422-C Valve Spring Compressor and Special tool 8519 Adapter, compress the valve spring.
NOTE: It may be necessary to tap the top of the valve spring to loosen the spring retainers locks enough to be removed.
4. Remove the two spring retainer lock halves.
NOTE: the valve spring is under tension use care when releasing the valve spring compressor.
5. Remove the valve spring compressor.
6. Remove the spring retainer, and the spring.
NOTE: Check for sharp edges on the keeper grooves. Remove any burrs from the valve stem before removing the valve from the cylinder head.
7. Remove the valve from the cylinder head.
NOTE: The valve stem seals are common between intake and exhaust.
8. Remove the valve stem seal. Mark the valve for proper installation.
TESTING VALVE SPRINGS
NOTE: Whenever the valves are removed from the cylinder head it is recommended that the valve springs be inspected and tested for reuse.
Inspect the valve springs for physical signs of wear or damage. Turn table of tool C-647 until surface is in line with the 40.12 mm (1.579 inch) mark on the threaded stud and the zero mark on the front. Place spring over the stud on the table and lift compressing lever to set tone device. Pull on torque wrench until a 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 any springs that do not meet specifications (Fig. 28).
INSTALLATION
1. coat the valve stem with clean engine oil and insert it into the cylinder head.
2. Install the valve stem seal. make sure the seal is fully seated and that the garter spring at the top of the seal is intact.
3. Install the spring and the spring retainer (Fig. 29).
4. Using the valve spring compressor, compress the spring and install the two valve spring retainer halves.
5. Release the valve spring compressor and make sure the two spring retainer halves and the spring retainer are fully seated.
6. lubricate the camshaft journal with clean engine oil then Position the camshaft (with the sprocket dowel on the left camshaft at 11 o'clock and the right camshaft at 12 o'clock), then position the camshaft bearing caps.
7. Install the camshaft bearing cap retaining bolts. Tighten the bolts 9 - 13 Nm (100 inch lbs.) in 1/2 turn increments in the sequence shown (Fig. 30).
8. Position the hydraulic lash adjusters and rocker arms.