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Checking the crankshaft and
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CONNECTING RODS
Ъ Measure:
crankshaft runout
Out of specification → Replace the crank-shaft.
Crankshaft runout
Less than 0.03 mm (0.0012 in)
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CRANKCASE AND CRANKSHAFT ENG
Ы Check:
crankshaft journal surfaces
crankshaft pin surfaces
bearing surfaces
Scratches/wear → Replace the crankshaft.
Ы Measure:
crankshaft-pin-to-big-end-bearing clear-
ance
Out of specification → Replace the big end bearings.
Crankshaft-pin-to-big-end-bear-ing clearance
0.026 ~ 0.050 mm
(0.0010 ~ 0.0020 in)
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The following procedure applies to all of the connecting rods.
CAUTION:
Do not interchange the big end bearings and connecting rods. To obtain the correct crankshaft-pin-to-big-end-bearing clear-ance and prevent engine damage, the big end bearings must be installed in their orig-inal positions.
Ь Clean the big end bearings, crankshaft pins and the inside of the connecting rod halves.
Ь Install the big end upper bearing into the connecting rod and the big end lower bear-ing into the connecting rod cap.
NOTE:
Align the projections a on the big end bear-ings 1 with the notches b in the connecting rod and connecting rod cap.
Э Put a piece of Plastigauge® on the crank-shaft pin.
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d. Assemble the connecting rod halves.
NOTE:
А Do not move the connecting rod or crank-shaft until the clearance measurement has been completed.
А Apply molybdenum disulfide grease onto the bolts, threads, and nut seats.
А Make sure that the “Y” mark c on the con-necting rod faces towards the left side of the crankshaft.
А Make sure that the characters d on both the connecting rod and connecting rod cap are aligned.
e. Tighten the connecting rod nuts.
CAUTION:
Б When tightening the connecting rod nuts, be sure to use an F-type torque wrench.
Б After tightening the connecting rod nut to the specified torque, turn the connecting rod nut another+90°.
Refer to “INSTALLING THE CONNECTING
RODS”.
T.
R.
Connecting rod nut
16 Nm (1.6 m · kg, 11 ft · lb) + 90°
Л Remove the connecting rod and big end bearings.
Refer to “REMOVING THE CONNECTING RODS”.
Л Measure the compressed Plastigauge® width 1 on each crankshaft pin.
If the clearance is out of specification,
select replacement big end bearings.
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P1 P3
P2
М Select:
big end bearings (P1, P2, P3)
NOTE:
Н The numbers И stamped into the crankshaft web and the numbers 1 on the connecting rods are used to determine the replacement big end bearing sizes.
Н “P1, P2, P3” refer to the bearings shown in the crankshaft illustration.
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For example, if the connecting rod “P1” and the crankshaft web “P1” numbers are “4” and “1” respectively, then the bearing size for “P1” is:
Bearing size for “P1”: “P1” (connecting rod) – “P1” (crankshaft web) = 4 – 1 = 3 (brown)
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BEARING COLOR CODE
| blue | |
| black | |
| brown | |
| green | |
О Measure:
crankshaft-journal-to-crankshaft-journal-
bearing clearance.
Out of specification → Replace the crank-shaft journal bearings.
Crankshaft-journal-to-crankshaft-journal-bearing clearance
0.040 ~ 0.082 mm
(0.0016 ~ 0.0032 in)
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The following procedure applies to all of the journal bearing.
CAUTION:
On the journal, the larger value is used as a basis for calculation of the oil clearance, and on the journal bearing, the smaller value is used.
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П Clean the surface of main journal and jour-nal bearings.
П Check the bearing surface. If the bearing surface is worn or scratched, the bearings should be replace.
NOTE:
If either of the right or left journal bearing is worn or scratched, both bearings should be replaced as a set.
Р Measure the outside diameter a of each main journal at two places. If it is out of specification, replace the crankshaft.
Р Measure the inside diameter b of each journal bearing at two places.
Р If journal bearing inside diameter is “45.03” and crankshaft journal outside diameter is “44.98”, then the main journal oil clearance is:
Main journal oil clearance: Journal bearing inside diameter – Main journal outside diameter = 45.03 – 44.98 = 0.05 mm
If the oil clearance is out of specification, select a replacement bearings.
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С Select:
crankshaft journal bearings (J1, J2)
NOTE:
Т The numbers И stamped into the crankshaft web and the numbers 1 on the crankcase are used to determine the replacement crankshaft journal bearing size.
Т “J1, J2” refer to the bearings shown in the crankshaft illustration.
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For example, if the crankcase “J1” and the crankshaft web “J1” numbers are “4” and “2” respectively, then the bearing size for “J1” is:
Bearing size for “J1”: “J1” (crankcase) –
“J1” (crankshaft web) = 4 – 2 = 2 (black)
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| BEARING COLOR CODE | ||
| blue | ||
| J1 | J2 | |
| black | ||
| brown | ||
| green |
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