Isuzu KB P190. 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