Service manual

ENGINE INSPECTION
OIL HOLE
: CLEARANCE 0.0005 - 0.0015 mm
(0.012 - 0.039 in)
PISTON PIN
LARGEEND--
BEARING CAP
INSTALL NEW
BEARING CAP
BOLTS
CONNECTING ROD
~SMALL END BUSHING
OIL HOLE
~BEARINGS
~
1. Visual Inspection. Check the connecting rod for cracks
or other damage and,
if necessary, replace it.
2. Bend Inspection. Using a connecting rod aligner, check
the bend and twist of the connecting rod and, if exceeding
the limit, repair it with a press or replace
it.
Bend Limit
71B/71C 0.05 mm (0.002 in)
per 100 mm (3.9 in)
3. InspeCting clearance between the piston pin and
small end bushing. Check the clearance between the
piston
pin and the small end bushing and, if it exceeds the
limit,
replace the piston pin or small bushing.
Clearance
71 B Standard: 0.012 - 0.031 mm (0.0005- 0.0015 in)
Limit: 0.05mm (0.002 in)
71C Standard: 0.014 - 0.041 mm (0.0006 - 0.0016 in)
Limit: 0.05
mm (0.002 in)
PISTON PIN
BUSHING~, ~~~=~!=~r~~~
4. Small end bushing replacement. Using a press,
press out the bushing. Align the oil passages of the
connecting rod and the small end bushing; press in the
bushing
to the connecting rod bore. After a small end
bushing
has been replaced, ream the bushing bore to obtain
the specified clearance between the small end bushing and
the piston pin.
REMOVING THE
SMALL END
,BUSHING
{7
PRESS
MANDREL---------.
'/' PRESSING ,IN
/ THE NEW
('BUSHING
OIL HOLES ----IIl .. 1
OIL HOLES,
NOTE: When reaming the bushing, correctly insert the
reamer in the bushing. In
order to prevent unevenness on
the bushing
surface, the reaming should always be made in
the cutting direction.
Make certain the reamer is stopped at
different positions at all times.
5. Inspecting connecting rod side play. Check the
connecting rod side play with the
<ljal gauge and, if it
exceeds the limit, replace the connecting rod and crankshaft.
Side Play Limit
71B/71C 0.40mm (0.016 in)
CONNECTING ROD
SIDE PLAY TEST
Engines & Generators
18