1D-114 Engine Mechanical: For J20 Engine
Connecting rod
• Big-end side clearance:
Check big-end of connecting rod for side clearance,
with rod fitted and connected to its crank pin in the
normal manner. If measured clearance is found to
exceed its limit, replace connecting rod.
Big-end side clearance
• Connecting rod alignment:
Mount connecting rod on aligner to check it for bow
and twist. If limit is exceeded, replace it.
Limit on bow
0.05 mm (0.0020 in.)
Limit on twist
0.10 mm (0.0039 in.)
Crank pin and connecting rod bearings
• Inspect crank pin for uneven wear or damage.
Measure crank pin for out-of-round or taper with a
micrometer. If crank pin is damaged, or out-of round
or taper is out of limit, replace crankshaft or regrind
crank pin referring to the following step 6).
Connecting rod bearing and crank pin
Out-of-round
“A” – “B”
Taper
“a” – “b”
Out-of-round and taper limits
0.01 mm (0.0004 in.)
•
Connecting rod bearing general information:
Inspect bearing shells for signs of fusion, pitting, burn
or flaking and observe contact pattern. Bearing shells
found in defective condition must be replaced.
Two kinds of connecting rod bearings are available;
standard size bearing and 0.25 mm (0.0098 in.)
undersize bearing. For identification of undersize
bearing, it is painted red (1) at the position as
indicated in the figure, undersize bearing thickness is
1.605 – 1.615 mm (0.0632 – 0.0635 in.) at the center
of it.
Standard
Limit
0.25 – 0.40 mm
(0.0099 – 0.0150 in.)
0.45 mm (0.0177 in.)
I4RH01140041-01
I4RH01140053-01
Item
Standard
Crank pin diameter
49.982 – 50.000 mm
(1.9768 – 1.9685 in.)
I2RH01140163-01
I2RH01140164-01
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