Caravan FWD L4-2.4L VIN X (1997)
Valve: Service and Repair
Removal and Installation
REMOVAL
1. With cylinder head removed, compress valve springs using Special Tool MD 998735 or equivalent.
2. Remove valve retaining locks, valve spring retainers, valve stem seals and valve springs.
3. Before removing valves, remove any burrs from valve stem lock grooves to prevent damage to the valve guides. Identify valves to insure
installation in original location.
INSTALLATION
1. Coat valve stems with clean engine oil and insert in cylinder head.
2. Install new valve stem seals on all valves using a valve stem seal tool. The valve stem seals should be pushed firmly and squarely over valve guide.
CAUTION: When oversize valves are used, the corresponding oversize valve seal must also be used. Excessive guide wear may result if oversize
seals are not used with oversize valves.
3. Install valve springs and retainers. Compress valve springs only enough to install locks, taking care not to miss-align the direction of compression.
Nicked valve stems may result from misalignment of the valve spring compressor.
CAUTION: When depressing the valve spring retainers with valve spring compressor the locks can become dislocated. Check to make sure both
locks are in their correct location after removing tool.
4. Check the valve spring installed height B after refacing the valve and seat. 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 (1.525 inch), install a 0.762 mm (0.030 inch) spacer under the valve spring
seat to bring spring height back within specification.
5. Install rocker arm shafts.
6. Checking dry lash. Dry lash is the amount of clearance that exists between the base circle of an installed cam and the rocker arm roller when the
adjuster is drained of oil and completely collapsed. Specified dry lash is 1.17 mm (0.046 inch) for intake and 1.28 mm (0.050 inch) for exhaust.
After performing dry lash check, refill adjuster with oil and allow 10 minutes for adjuster's to bleed down before rotating cam.