Cylinder Head Assembly Service: Removing Head for Durango 4WD V8-59L VIN Z
Valve Spring: Service and Repair
Cylinder Head Off
REMOVAL
1. Remove the cylinder head.
2. Compress valve springs using Valve Spring Compressor Tool MD- 998772A.
3. Remove valve retaining locks, valve spring retainers, valve stem seals and valve springs.
4. Before removing valves, remove any burrs from valve stem lock grooves to prevent damage to the valve guides. Identify valves to ensure
installation in original location.
INSTALLATION
1. Coat valve stems with lubrication oil and insert them in cylinder head.
2. If valves or seats are reground, check valve stem height. If valve is too long, replace cylinder head.
3. Install new seals on all valve guides. Install valve springs and valve retainers.
4. Compress valve springs with Valve Spring Compressor Tool MD-998772A, install locks and release tool. If valves and/or seats are ground,
measure the installed height of springs. Make sure the measurement is taken from bottom of spring seat in cylinder head to the bottom surface of
spring retainer. If spacers are installed, measure from the top of spacer. If height is greater than 42.86 mm (1 11/16 inches), install a 1.587 mm
(1/16 inch) spacer in head counterbore. This should bring spring height back to normal 41.27 to 42.86 mm (1 5/8 to 1 11/16 inch).
