Chrysler 1998 Voyager Service Manual page 1254

9 - 76 ENGINE
CLEANING AND INSPECTION (Continued)
VALVES AND VALVE SPRINGS
VALVE CLEANING
Clean all carbon deposits from the combustion
chambers, valve ports, valve stems, valve stem
guides and heads.
Clean all grime and gasket material from the
engine cylinder head machined gasket surfaces.
INSPECTION
Inspect for cracks in the combustion chambers and
valve ports.
Inspect for cracks on the exhaust seat.
Inspect for cracks in the gasket surface at each
coolant passage.
Inspect valves for burned, cracked or warped
heads.
Inspect for scuffed or bent valve stems.
Replace valves displaying any damage.
Check valve spring height. (Fig. 72).
Fig. 72 Valve Spring Chart
HYDRAULIC TAPPETS
(1) Clean all tappet parts in a solvent that will
remove all varnish and carbon.
(2) Replace tappets that are unfit for further ser-
vice with new assemblies.
(3) If plunger shows signs of scoring or wear,
install a new tappet assembly. If valve is pitted, or
valve seat on end of plunger is prevented from seat-
ing, install a new tappet assembly.
OIL PUMP
CLEANING
Wash all parts in a suitable solvent and inspect
carefully for damage or wear (Fig. 74).
INSPECTION
(1) Before installing oil pump check pump bore
depth in block (A) and pump body height (B) (Fig.
73). Difference between A and
0.020-0.082 mm.
(2) Check clearance between rotors (Fig. 75).
Fig. 73 Oil Pump Bore Depth
Fig. 74 Oil Pump Inner and Outer Rotors
PISTON AND CONNECTING ROD
PISTONS
(1) Piston Diameter: Size Group A: 91.93-91.94mm
(3.6191-3.6196 in.) Size Group B: 91.94-91.95mm
NS/GS
B should be