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Engine Mechanical – V6 Page 6A1–280
Page 6A1–280
7 Reinstall the oil pan and oil pump pick up assembly, refer to 4.2 Oil Pan and Oil Pump Suction Pipe Assembly.
8 Reinstall the cylinder heads, refer to 3.22 Cylinder Head Assembly.
9 Reinstall the engine assembly, refer to 4.1 Engine .
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Page 3058 of 6020

Engine Mechanical – V6 Page 6A1–281
Page 6A1–281
4.6 Crankshaft and Main Bearings
1 Remove the engine assembly, refer to 4.1 Engine .
2 Remove both cylinder head assemblies, refer to 3.22 Cylinder Head Assembly.
3 Remove the oil pan assembly, refer to 4.2 Oil Pan and Oil Pump Suction Pipe Assembly .
4 Remove the piston and connecting rod assemblies, refer to 4.5 Pistons, Pins, Rings, Connecting Rods and Big-
end Bearings .
5 Remove the oil pump assembly, refer to 3.17 Oil Pump Assembly.
6 Remove the crankshaft rear oil seal and plate assembly, refer to 4.4 Crankshaft Rear Seal and Plate Assembly .
7 Remove the crankshaft position sensor, refer to Section 6C1-3 Engine Management – V6 – Service Operations.
Crankshaft End Play Measurement
1 Place a dial indicator at the end of the crankshaft nose.
2 Gently force the crankshaft towards the front and rear of the cylinder block with a lever while monitoring the
movement of the dial indicator.
3 The crankshaft endplay should not exceed specifications, refer to 5 Specifications.
4 If the specifications are ex ceeded, inspect the thrust bearing thrust outer diameter and the crankshaft thrust wall for
wear and/or excessive runout. Compare the va lues with the specifications, refer to 5 Specifications.
5 Replace the thrust bearing or crankshaft as required.
Remove
1 Remove the crankshaft bearing cap side bolts (3).
CAUTION
The crankshaft bearing cap outer bolts are
yield tightened during assembly and must
be replaced prior to reassembly. Crankshaft
bearing cap outer bolts that are not replaced
will not torque to the correct clamp load and
can lead to serious engine damage.
2 Remove the crankshaft bearing cap outer bolts (1).
3 Remove the crankshaft bearing cap inner bolts (2).
Figure 6A1 – 500
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Engine Mechanical – V6 Page 6A1–282
Page 6A1–282
4 Loosen the nuts (1) of the crankshaft main bearing
cap remover, Tool No. J-41818 (2) to separate the
chamfered collets. Install the collets into the inner bolt
holes of the front main bearing cap (3).
5 Tighten the remover nuts to the correct torque specification.
Crankshaft bearing cap remover nut.................11.0 Nm.
6 Install a slide hammer, Tool No. J-6125-1B (4) onto the crankshaft bearing cap remover and remove the
crankshaft bearing cap.
7 Repeat steps 9 to 14 for the remaining crankshaft bearing caps.
Figure 6A1 – 501
8 Remove the crankshaft (1) from the engine block (2), lifting evenly to avoid jamming against the main thrust
bearing.
9 Place the crankshaft in a secure place.
Figure 6A1 – 502
10 If required, remove the crankshaft sprocket drive pin (1) from the crankshaft (2),
Figure 6A1 – 503
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Engine Mechanical – V6 Page 6A1–283
Page 6A1–283
Crankshaft Bearing
1 Prepare a piece of cardboard or similar, numbered 1
– 4 for bearing identification.
NOTE
Main bearing journals are numbered from the
front of the engine.
2 Remove the crankshaft upper bearing halves from the cylinder block. Note the position of the thrust
bearing (1) at the number 3 journal (2).
3 Place the crankshaft upper bearing halves on the cardboard in the correct positions.
Figure 6A1 – 504
4 Remove the crankshaft lower bearing halves (2) from the crankshaft bearing caps (1).
5 Place the crankshaft lower bearing halves in the correct positions on the cardboard.
Figure 6A1 – 505
Clean and Inspect
Crankshaft and Main Bearing Cleaning
Safety glasses must be worn when using
compressed air.
Clean the following components in solvent and then dry with compressed air:
• crankshaft bearings,
• connecting rod bearings,
• crankshaft journals,
• crankpin journals,
• crankshaft oil passages, and
• crankshaft threaded holes.
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Page 3061 of 6020

Engine Mechanical – V6 Page 6A1–284
Page 6A1–284
Crankshaft and Main Bearing Visual Inspection
1 Perform the following visual inspections:
• Inspect the crankshaft balancer bolt hole (1) for
thread damage.
• Inspect the crankshaft balancer mounting
area (2) for damage.
• Inspect the crankshaft sprocket pin hole (3) for
damage.
• Inspect the oil pump drive flats (4) for damage.
• Inspect the crankshaft main journals (5) for
damage.
• Inspect the crankshaft connecting rod
journals (6) for damage.
• Inspect the crankshaft oil passages (7) for
obstructions.
• Inspect the crankshaft main bearing thrust wall
surfaces (8) for damage.
• Inspect the crankshaft counterweights (9) for
damage.
• Inspect the crankshaft reluctor ring teeth (10) for
damage.
• Inspect the crankshaft rear main oil seal surface
(11) for damage.
• Inspect the crankshaft engine flexplate
mounting surface (12) for damage.
• Inspect the crankshaft pilot hole (13) for
damage.
• Inspect the crankshaft engine flywheel bolt
holes (14) for thread damage.
2 Repair or replace the crankshaft as required.
Figure 6A1 – 506
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Page 3062 of 6020
Engine Mechanical – V6 Page 6A1–285
Page 6A1–285
Crankshaft Main Bearing Inspection
CAUTION
All connecting rod and main journal bearings
that have been used in a running engine must
be replaced. Never re-use the crankshaft or
connecting rod bearings.
NOTE
The following bearing wear conditions should be
used to diagnose engine operating conditions or
root cause of a condition.
1 Inspect for fatigue indicated by craters or pockets (2). Flattened sections on the bearing halves (1) also
indicate fatigue.
Figure 6A1 – 507
2 Inspect for excessive sco ring or discoloration (2) on
both front and back of t he bearing halves (1).
3 Inspect the main bearings for dirt embedded into the bearing material.
Figure 6A1 – 508
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Page 3063 of 6020
Engine Mechanical – V6 Page 6A1–286
Page 6A1–286
4 Inspect for incorrect seating indicated by bright,
polished sections (1).
Figure 6A1 – 509
Crankshaft Measurement
1 Using a suitable fixture (1 ), support the crankshaft (2).
Figure 6A1 – 510
2 Using a dial indicator (1) and magnetic base (2), rotate the crankshaft (3) carefully by hand. Measure
the crankshaft main journals for runout and compare
with the engine specifications, refer to
5 Specifications .
Figure 6A1 – 511
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Engine Mechanical – V6 Page 6A1–287
Page 6A1–287
3 Measure the crankshaft thrust wall width (1) for wear
using an inside micrometer and compare with the
engine specifications, refer to 5 Specifications.
4 Measure the crankshaft thrust wall surface (2) for runout using a dial indica tor, mounted to a magnetic
stand and compare with t he engine specifications,
refer to 5 Specifications .
5 If the crankshaft journals are damaged or worn beyond specifications, t he crankshaft may be ground
0.25 mm. There is only one size of oversized main
bearings available for service.
Figure 6A1 – 512
6 Inspect the crankshaft main journals (1) for undersize, using an outside micrometer (2).
Figure 6A1 – 513
7 Inspect the crankpins (1) for undersize using an outside micrometer (2).
8 Compare your measurements with those listed in the
engine specifications, refer to 5 Specifications. If the
crankpin journals are worn beyond the specifications,
the crankshaft may be ground 0.25 mm. Only one
size of oversized connecting rod bearings available
for service.
Figure 6A1 – 514
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