Kohler KDI 1903M - Page 102

8
INFORMATION ABOUT OVERHAULING
EN 102
8.5.1 Connecting rod dimensions check
Important
•
Before assembling the connecting rod and pistons
(Par. 9.3.7 e 9.3.8), check that the difference in
weight between the complete connecting rod and
piston units do not exceed 8 gr to prevent weight
imbalances during rotation of the crankshaft and
consequent damage.
•
Mark some references on the connecting rods,
caps Q, pistons and gudgeon pins to preve
nt
uni
ntentionally confusing the components during
assembly. Failure to do this may result in engine
malfunctions.
•
Connecting rod half-bearings S must be there wi
th
each
assembly.
Check that the contact surfaces are perfectly clean and
intact.
Assemble the connecting rod cap Q to the connecting rod
with the half-bearings S and tighten capscrews P
(tightening torque at 25 Nm).
With a dial gauge, measure diameters B and D.
The MAX allowed value of wear for B and D is 0.06 mm.
Tab 8.6
REF.
DIMENSIONS (mm)
CLEARANCE VALUE (mm)
A
169.980 - 170.020
B
30.020 - 30.030
0.025 - 0.030
C
29.995 - 30.000
D
54.035 - 54.066
E
67.700 - 68.000
F
29.750 - 29.790
Important
•
Tab. 8.6 details the dimensional values of new
components only.
•
Check that the connecting rod and crankshaft half-
bearings are coupled properly.
•
Refer to the warnings in Par. 8.4.1 for value D
decreased.
•
If the clearance value between B and C is no
t
o
bserved, you are required to replace bearing
R
(
Fig. 8.12).
Fig. 8.11
F
ig 8.12
F
ig 8.13