Overhaul
CONNECTING ROD1) Check that the large or small end thrust surface is not damaged.
2) Install the connecting rod to the crankshaft, and check the thrust clearance using a thickness gauge. If it is not within the standard, replace the connecting rod.
NOTE:
^ Do not forget to install the connecting rod bearing and the connecting rod cap bearing, when installing the connecting rod to the crankshaft.
^ Measurement should be performed at a temperature of 20°C (68°F).
^ Measure the thrust clearance of each connecting rod at several points, and replace the connecting rod if there is uneven wear.
Connecting rod thrust clearance:
Standard
0.070 - 0.330 mm (0.0028 - 0.0130 in)
3) Check for bend or twist using a connecting rod aligner. If it exceeds the limit, replace the connecting rod.
Limit of bend or twist per 100 mm (3.94 in) in length:
0.10 mm (0.0039 in)
4) Inspect the connecting rod bearing for scar, peeling, seizure, melting or wear, etc.
5) Check the oil clearance on each connecting rod bearing using plastigauge. If it is not within the standard, replace the connecting rod bearing.
NOTE:
^ Measurement should be performed at a temperature of 20°C (68°F).
^ Measure the outer diameter of crank pin using micrometer, and select the suitable size connecting rod bearing when replacing the connecting rod bearing.
Connecting rod oil clearance:
Standard
0.017 - 0.047 mm (0.0007 - 0.0019 in)
6) Check the bushing at connecting rod small end for damage.
7) Check the clearance between piston pin and bushing at connecting rod small end. Check the clearance between the piston pin and bushing at connecting rod small end by measuring respectively the outer diameter of piston pin and the inner diameter of bushing at connecting rod small end.
(1) Measure the outer diameter of piston pin with a micrometer.
NOTE:
^ Measurement should be performed at a temperature of 20°C (68°F).
^ Record the measured value.
(2) Using a caliper gauge, measure the inner diameter of bushing at connecting rod small end.
NOTE:
^ Measurement should be performed at a temperature of 20°C (68°F).
^ Record the measured value.
(3) Calculate the clearance between piston pin and bushing at connecting rod small end.
Clearance between piston pin hole and piston pin:
Standard
0.004 - 0.008 mm (0.0002 - 0.0003 in)
8) If the clearance between piston pin and bushing at connecting rod small end exceeds the standard, replace the piston pin and bushing at connecting rod small end as a set. For replacement procedure of bushing at connecting rod small end, refer to the following.
(1) Remove the bushing from connecting rod with ST and press.
(2) Press the bushing with ST and the press, after applying engine oil on the periphery of bushing.
ST 18350AA000 CONNECTING ROD BUSHING REMOVER AND INSTALLER
(3) Make two 3 mm (0.12 in) holes in the pressed bushing to match the pre-manufactured holes on the connecting rod, then ream the inside of the bushing.
(4) After completion of reaming, clean the bushing to remove chips.