Engine / Cooling
3.51
Engi ne Inspec tion -- All Engines
Connecting Rod Small End Inspection
1. Clean small end of connecting rod and inspect inner
bore with a magnifying glass. Look for any surface
irregularities including pitting, wear , or dents.
2. Run your fingernail around the inside of the rod and
check for rough spots, galling, or wear.
3. Oil and install needle bearing and pin in connecting
rod. Rotate pin slowly and check for rough spots or
any resistance to movement. Slide pin back and
forth through bearing while rotating and check for
rough spots.
4. With pin and bearing centered in rod, twist ends back
and forth in all directions to check for excessive axial
play. Pull up and down evenly on both ends of pin to
check for radial play. Replace pin andbearing if there
is any resistance to rotation or excessive axial or
radial movement. If play or roughness is evident with
a new pin and bearing, replace the connecting rod.
Piston Inspection/Measurement
1. Check piston for scoring or cracks in piston crown or
pin area. Excessive carbon buildup below the ring
lands is an indication of piston, ring or cylinder wear.
2. Measure piston outside diameter at a point 10 mm
(3/8²)upfrombottomofskirtata90° angle to the
direction of the piston pin. Record the
measurement for each piston.
NOTE: The piston must be measured at this point to
provide accurate piston-to-cylinder clearance measure-
ment.
3. Subtract this measurement from the minimum
cylinder measurement recorded previously. If
clearance exceeds the service limit, determine if
piston or cylinder is worn and recondition or replace
as necessary.
10mm
Piston
Piston Pin
Piston to Cylinder Clearance
STD: .0055 - .0065² (.14 - .16mm)
Service Limit: .010² (.25 mm)
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