ENGINE REPAIR (Cont'd)
Servicing The Connecting Rods
And
Pistons
(Cont'd)
Measure the piston pin hole [A).
The specifications are
0.9055-0.9060 inch (23-23,013
mm)
. The wear limit
is
0.9076 inch (23,053 mm).
Measure the piston pin
(Item 1) [B] and the connecting
rod
busing (Item 2) [B]. B
The clearance specification
is
0.0006-0.0026 inch
(0
,0015-0,
07
mm).
The allowable limit
is
0.0059 inch
(0
,149 mm)
If
the
clearance exceeds the allowable limit, replace the part.
NOTE: When
the
replacement
bushing
is
installed,
be
sure
to
drill
the
oil
hole
in
the
bushing.
~urr
the
hole
after
drilling
[B].
Put
the piston ring
on
the bottom of the cylinder.
Check the clearance of the ring gap [C].
The specification
is
0.0018-0.0177 inch (0,
046-0
,45
mm). The wear limit
is
0.0492 inch
(1
,25 mm).
Install the connecting
rod
on the tool for checking
connecting
rod
alignment.
Check the clearance at the piston pin area
[0].
The specifications are 0.0008 inch ( 0,02 mm).
The wear limit
is
0.0020 inch
(0
,05 mm).
NOTE: Be
sure
the
bushing
diameter
of
the
connecting
rod
is
within
specification.
Revised Jan. 92
D
-7C-31-
EH>3622
EH>406
7
741
, 742, 743, 7430S
Bobcat
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Service Manual
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