Grand Caravan V6-3.3L VIN R (2005)
Valve Spring: Service and Repair
Off Vehicle Service
REMOVAL - CYLINDER HEAD OFF
1. With the cylinder head on a bench, position Special Tool C-3422-D with Adapter on the valve and spring retainer (Fig. 20).
2. Compress the spring only enough to remove the valve retainer locks.
3. Slowly release the spring tension and remove the valve spring and retainer.
4. For removal of the valve stem seal (Refer to ENGINE/CYLINDER HEADVALVE STEM SEALS REMOVAL).
INSPECTION
NOTE: The are two different types of valve springs used that are interchangeable, but have different specifications(Refer to - ENGINE CYLINDER
HEADVALVE SPRINGS - DESCRIPTION).
Whenever valves have been removed for inspection, reconditioning or replacement, valve springs should be tested (Fig. 22). As an example; the
compression length of a spring to be tested is 38.00 mm (1.496 inch). Turn the table of Tool C-647 until surface is in line with the 38.00 mm (1.496
inch) 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 Engine Specifications to obtain specified height and
allowable tensions (Refer to ENGINE - SPECIFICATIONS). Replace any springs that do not meet specifications.
INSTALLATION - CYLINDER HEAD OFF
1. If removed, install a new valve stem seal (Refer to - ENGINE/CYLINDER HEAD/VALVE STEM SEALS - INSTALLATION).
2. Position valve spring and retainer on spring seat.
