Engine Mechanical – V6 Page 6A1–207
Page 6A1–207
7 Measure the camshaft lobes for wear using a dial
indicator (1).
Figure 6A1 – 342
8 Place the dial indicator tip on the base circle (1) of the camshaft lobe.
9 Set the dial indicator at zero.
10 Rotate the camshaft until the indicator tip is at the highest point (2) on the lobe. This reading is the lift of
the camshaft lobe.
Figure 6A1 – 343
Reinstall
Right-hand Side
1 Select the correct camshaft for the particular installation location. ID markings are on the rear end
of each camshaft. The ID markings are defined as
follows:
• The first five digits refer to the date and time of
production.
• Example = 3L18H.
• Digits six through nine refer to engine
production code.
• LY7 = Alloytec 190 engine.
• The last two digits refer to position:
• LI = left-hand intake.
• LE = left-hand exhaust.
• RI = right-hand intake.
• RE = right-hand exhaust.
Figure 6A1 – 344
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ISUZU KB P190 2007
Engine Mechanical – V6 Page 6A1–224
Page 6A1–224
Valve Guide Measurement
1 Measure the valve stem (1) to-guide (2) clearance.
Excessive valve stem-to-guide clearance may cause
excessive oil consumption and may also cause a
valve to break. Insufficient clearance will result in
noisy and sticky functioning of the valve and will
disturb the engine assembly smoothness.
2 Clamp a dial indicator to the cylinder head at the camshaft cover rail.
3 Locate the dial indicator so the movement of the valve
stem from side to side, crossways to the cylinder
head, will cause a direct mo vement of the indicator
stem. The dial indicator stem must contact the side of
the valve stem just above the valve guide.
4 Drop the valve head about 0.064 mm off the valve seat.
5 Use light pressure when moving the valve stem from side to side to obtain a clearance reading, refer to
5 Specifications .
• If the clearance for the valve is greater than
specified and a new st andard diameter valve
stem will not bring the clearance within
specifications, the valv e guide may be oversized
by 0.075 mm using the valve guide reamer, Tool
No. J 42096 or by 0.375 mm using the valve
guide reamer, Tool No. EN-46120. Two sizes of
oversized valve stems are available for service.
• Valve guide wear at the bottom 10 mm of the
valve guide is not significant enough to affect
normal operation.
• If over sizing the guide does not bring the
clearance within specif ications, replace the
cylinder head.
Figure 6A1 – 379
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ISUZU KB P190 2007
Engine Mechanical – V6 Page 6A1–227
Page 6A1–227
2 Measure the seat width on the valve face (1) using a
correct scale.
CAUTION
The seat contact area must be at least
0.5 mm from the outer diameter (margin) of
the valve. If the contact area is too close to
the margins, the seat must be reconditioned
to move the contact area away from the
margin.
3 Compare the measurements with the specifications,
refer to 5 Specifications .
4 If the seat widths are a cceptable, check the valve
seat roundness, refer to Valve Seat Roundness
Measurement Procedure in this Section.
5 If the seat width is not acceptable, grind the valve
seat to bring the width back to specification. Correct
valve seat width is critical to providing the correct
amount of valve heat dissipat ion, refer to Valve and
Seat Reconditioning Procedure in this Section.
Figure 6A1 – 383
Valve Seat Roundness Measurement Procedure
1 Measure the valve seat roundness using a dial indicator a ttached to a tapered pilot installed in the guide. The pilot
should have a slight bind w hen installed in the guide.
CAUTION
The correct size pilot must be used. Do not
use adjustable diameter pilots. Adjustable
pilots may damage the valve guides.
2 Compare your measurements with the specifications, refer to 5 Specifications.
3 If the valve seat exceeds the roundne ss specification, grind the valve and valve seat, refer to Valve and Seat
Reconditioning Procedure in this Section.
4 If new valves are being used, the valv e seat roundness must be within 0.05 mm.
Valve Margin Measurement Procedure
1 Measure the valve margin using an appropriate scale.
2 Refer to 5 Specifications for minimum valve margin
and compare them to your measurements.
3 If the valve margins are beyond specification, replace the valves.
4 If the valve margins are within specification and do not require refacing, test the valve for seat
concentricity, refer to Valve-to-Seat Concentricity
Measurement Procedure in this Section.
Figure 6A1 – 384
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ISUZU KB P190 2007
Engine Mechanical – V6 Page 6A1–245
Page 6A1–245
35 Disconnect the harness connector from the transmission, refer to Section 7B1 Manual Transmission – V6 or
Section 7C1, Section 7C2, Section 7C3 or Section 7C4 for automatic transmission.
36 Remove the left-hand side exhaust manifold upper heat shield (1), (Automatic transmission only).
Figure 6A1 – 420
37 Progressively loosen the seven exhaust manifold attaching bolts (2), working from the outside to the
centre and then remove the bolts.
38 Manoeuvre the exhaust manifold (3), away from the cylinder head.
39 Remove and discard the exhaust manifold to cylinder head gasket.
Figure 6A1 – 421
40 Remove the engine oil level indicator assembly (1), (automatic transmission only).
41 Remove the left-hand side exhaust manifold, (automatic transmission only).
Figure 6A1 – 422
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ISUZU KB P190 2007
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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ISUZU KB P190 2007
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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ISUZU KB P190 2007