Specifications

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. 92).
INSPECTION
(1) Before installing oil pump check pump bore
depth in block (A) and pump body height (B) (Fig.
91). Difference between A and B should be
0.020-0.082 mm.
(2) Check clearance between rotors (Fig. 93).
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
(3.6196-3.6200 in.). Maximum wear limit .05mm
(.0019 in.).
(2) Check piston pin bores in piston for roundness.
Make 3 checks at 120° intervals. Maximum out of
roundness .05mm (.0019in.).
(3) The piston diameter should be measured
approximately 15 mm (.590 in.) up from the base.
(4) Skirt wear should not exceed 0.1 mm (.00039
in.).
(5) The clearance between the cylinder liner and
piston should not exceed 0.25 mm (.0009 in.).
(6) Make sure the weight of the pistons does not
differ by more than 5 g.
CONNECTING ROD
(1) Assemble bearing shells and bearing caps to
their respective connecting rods ensuring that the
serrations on the cap and reference marks are
aligned.
(2) Tighten bearing cap bolts to 29 N·m (21 ft. lbs.)
plus 60°.
(3) Check and record internal diameter of crank
end of connecting rod.
Fig. 91 Oil Pump Bore Depth
Fig. 92 Oil Pump Inner and Outer Rotors
Fig. 93 Checking Rotor Clearance
NS/GS ENGINE 9 - 75
CLEANING AND INSPECTION (Continued)