Commander 4WD V8-4.7L (2008)
Valve: Removal and Replacement
Removal
REMOVAL
NOTE: The cylinder heads must be removed in order to perform this procedure.
1. Remove rocker arms and lash adjusters.
2. Remove the camshaft bearing caps and the camshaft.
NOTE: All eight 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 in.) 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 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 Engine Specifications to obtain specified height and allowable tensions.See:
Specifications/Engine Specifications
Replace any springs that do not meet specifications.
