Isuzu KB P190. Service manual — part 747

Engine Mechanical – V6

Page 6A1–211

Page 6A1–211

4

Ensure the camshaft lobes are in the neutral position
with the flats on the back of the camshafts up and
parallel (1) with the left-hand cylinder head camshaft
cover rail.

5

Ensure the marks on the left-hand exhaust camshaft
position actuator and timing chain, made prior to the
disassemble operation are aligned.

6

Ensure the marks on the left-hand intake camshaft
position actuator and timing chain, made prior to the
disassemble operation are aligned.

Figure 6A1 – 354

7

Observe the markings on the left-hand cylinder head
camshaft bearing caps. Each bearing cap is
marked (1) to identify its location. The markings have
the following meanings:
•

The raised feature must always be oriented
toward the centre of the cylinder head.

•

The I indicates the intake camshaft.

•

The E indicates the exhaust camshaft.

•

The number 2, 4, 6 indicates the cylinder
position from the front of the engine.

8

Apply a liberal amount of engine oil to the camshaft
bearing caps.

Figure 6A1 – 355

9

Install the camshaft bearing thrust cap (1) in the first
journal of the left-hand cylinder head.

10

Install the remaining bearing caps (2) with their
orientation mark toward the centre of the cylinder
head.

11

Hand start all the camshaft bearing cap bolts (3).

Figure 6A1 – 356

Engine Mechanical – V6

Page 6A1–212

Page 6A1–212

12

Tighten the camshaft bearing cap bolts to the correct
torque specification and in the sequence shown.

Camshaft bearing cap
bolt torque specification:

Stage 1: . . . . . . . . . . . . . 8.0 – 12.0 Nm

13

Loosen the centre intake camshaft bearing cap bolts
1, and 2, and the centre exhaust camshaft bearing
cap bolts 3 and 4.

14

Retighten the centre camshaft bearing cap bolts 1, 2,
3 and 4 to the correct torque specification.

Camshaft bearing cap
bolt torque specification:

Stage 2: . . . . . . . . . . . . . 8.0 – 12.0 Nm

15

Install the right-hand cylinder head camshaft
sprocket, refer to

3.18 Camshaft Sprocket

.

Figure 6A1 – 357

Engine Mechanical – V6

Page 6A1–213

Page 6A1–213

3.21 Rocker

Arm

Remove

1

Remove the camshafts from the appropriate cylinder head, refer to

3.19 Camshaft

.

2

Remove the rocker arm (1) from the cylinder head (2).

N O T E

Record the rocker arm positions during removal.

CAUTION

If the rocker arms are being reused, they
must be reinstalled in their original location.

Figure 6A1 – 358

Clean and Inspect

1

Inspect the rocker arm roller (1) for the following:
•

flat spots,

•

excessive scoring and pitting, and

•

ensure the roller spins freely

2

Inspect the rocker arm valve tip area (2).

3

Inspect the rocker arm stationary hydraulic lash
adjuster (SHLA) pivot area (3).

4

Replace the rocker arm as required.

Figure 6A1 – 359

Engine Mechanical – V6

Page 6A1–214

Page 6A1–214

Reinstall

1

Apply a liberal amount of commercially available
camshaft / lifter prelube or equivalent to the pivot
pocket (1), roller (2) and valve slot (3) areas of the
camshaft followers.

Figure 6A1 – 360

2

Place the rocker arm in position on the valve tip and
stationary hydraulic lash adjuster (SHLA). The
rounded head end of the arm seats on the SHLA
while the flat end seats on the valve tip.

CAUTION

• The rocker arm (1) must be positioned

squarely on the valve tip so the full width
of the roller will completely contact the
camshaft lobe.

• If the rocker arms are being reused, they

must be reinstalled in their original
location.

3

Clean the camshaft journals and carriers with a clean,
lint-free cloth.

4

Reinstall the camshafts, refer to

3.19 Camshaft

.

Figure 6A1 – 361