Caravan V6-3.3L VIN R (2003)
Valve Spring: Service and Repair
In Vehicle Service
Removal
REMOVAL - CYLINDER HEAD ON
1. Disconnect negative cable from battery.
2. Remove spark plug wires and all spark plugs.
3. Remove cylinder head cover(s).
4. Remove rocker arms and shaft.
5. Rotate engine until the piston in the cylinder bore requiring spring removal is at TDC.
Fig.38
6. Install Special Tool 8453 to the cylinder head (Fig. 38). Tighten the attaching bolts to 23 Nm (200 in. lbs.).
7. Install a spark plug adapter in the spark plug hole. Connect air hose that can supply 620.5 - 689 kPa (90 - 100 psi) of air pressure to adapter. This
is to hold valves in place while servicing components.
8. Locate the forcing screw and spring retainer adapter assembly over the spring requiring removal (Fig. 38).
9. Slowly turn the forcing screw clockwise (compressing the valve spring) until the valve keepers can be removed.
10. Turn forcing screw counterclockwise to relieve spring tension. Remove retainer and valve spring.
11. Repeat procedure for each cylinder requiring valve spring removal.
Installation
INSTALLATION - CYLINDER HEAD ON
1. The intake valve stem seals should be pushed firmly and squarely over the valve guide using the valve stem as guide. Do Not Force seal against
top of guide. When installing the valve retainer locks, compress the spring only enough to install the locks.
CAUTION: Do not pinch seal between retainer and top of valve guide.
2. Follow the same procedure on the remaining 5 cylinders using the firing sequence 1-2-3-4-5-6. Make sure piston in cylinder is at TDC on the valve
spring that is being covered.
3. Remove spark plug adapter tool.
4. Install rocker arms and shaft assembly.
5. Install cylinder head covers.
6. Install spark plugs and connect wires.
7. Connect negative cable to battery.
