Chapter 2 Basic Engine
6. Connecting Rod
.4LHA Series
6.
Connecting
Rod
The connecting rod is made of high-strength forged car-
bon steel.
The large end
with
the special aluminum-alloy metal
can
be separated
into
two and the small end has a copper
alloy coil bushing.
Piston
pin bushing
Connecting rod —
(big
end
cap)
Connecting rod
Lube,
oil hole
Crank
pin
metal
- —Connecting rod
bolt
6-1
Inspecting
the
connection
rod
6-1.1
Twist
and
parallelism
of the
large
and
small
ends
Insert
the measuring
tool
into
the large and small ends of
the connecting rod. Measure the extent of
twist
and
parallelism and replace if they exceed the tolerance.
Parallelism
Measuring
twist
mm (in.^
Standard
Wear
limit
Connecting rod
twist
and parallelity
0.05/100 or less
(0.0020/3.94)
0.2
(0.0079)
6-1.2 Checking
thrust
clearance
Fit the respective crank pins to the connecting rod anc
check to make sure
that
the clearance in the crankshaf
direction is correct.
Feeler
gauge
mm (in.)
Standard
Wear
limit
Connecting rod side
clearance
0.2 - 0.4
(0.079-0.0157)
0.45
(0.0177)
Measuring parallelism
2-25
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