Specifications

Note: When changing connecting rods, all four
must have the same weight and be stamped with the
same number. Replacement connecting rods will
only be supplied in sets of four.
(4) Connecting rods are supplied in sets of four
since they all must be of the same weight category.
Max allowable weight difference is 18 gr. NOTE: On
one side of the big end of the con-rod there is a two-
digit number which refers to the weight category. On
the other side of the big end there is a four digit
number on both the rod and the cap. These numbers
must both face the camshaft as well as the recess on
the piston crown (Fig. 94). Lightly heat the piston in
oven. Insert piston pin in position and secure it with
provided snap rings. The Four digit numbers
marked on con rod big end and rod cap must
be on the same side as the camshaft (Fig. 94) .
After having coated threads with Molyguard, tighten
con rod bolts to 29 N·m (21 ft. lbs.) plus 60°.
PISTON PIN
(1) Measure the diameter of piston pin in the cen-
ter and both ends (Fig. 95).
(2) Piston pin diameter is 29.990 to 29.996mm
(1.1807 to 1.1809 in.).
CRANKSHAFT
CRANKSHAFT JOURNALS
(1) Using a micrometer, measure and record crank-
shaft connecting rod journals, take reading of each
journal 120° apart. Crankshaft journal diameter is
53.84 to 53.955mm (2.1196 to 2.1242 in.).
(2) Crankshaft journals worn beyond limits or
show signs of out of roundness must be reground or
replaced. Minimum reground diameter is 53.69mm
(2.1137 in.).
BEARING-TO-JOURNAL CLEARANCE
Compare internal diameters of connecting rod with
crankshaft journal diameter. Maximum clearance
between connecting rod and crankshaft journals .022
to .076mm (.0008 to .0029 in.) (Fig. 96).
CRANKSHAFT MAIN BEARING
INSPECTION
(1) Fit main bearing carriers together and torque
to 42 N·m (31 ft. lbs.)
Fig. 94 Connecting Rod Identification
Fig. 95 Piston, Connecting Rod and Pin
Fig. 96 Bearing Clearance
9 - 76 ENGINE NS/GS
CLEANING AND INSPECTION (Continued)