Isuzu KB P190. Manual - part 717

Engine Mechanical – V6 

Page 6A1–91 

 

Page 6A1–91 

3.11  Exhaust Manifold Assembly 

Remove 

 

Allow the engine to cool before commencing. 

 

Disconnection of the battery affects 

 

certain vehicle electronic systems, refer to  

1.1  WARNING, CAUTION and NOTES

 before 

disconnecting the battery. 

1 

Disconnect the battery negative terminal. 

2 

Remove the oxygen sensor harness connector (1) 
from the retaining bracket. 

3 

Disconnect the oxygen sensor wiring harness 
connector from the engine wiring harness connector  
(2). 

4 

Unclip the oxygen sensor wiring harness retaining clip 
and move aside. 

5 

For the left-hand side: 

Remove the oil level indicator tube. 

6 

Raise the front of the vehicle and place on stands, 
refer to 

Section 0A General Information

. 

7 

Working from under the vehicle, remove the two 
exhaust manifold to exhaust pipe flange nuts, refer to 

Section 6F Exhaust System - V6

. 

Figure 6A1 – 56 

8 

Remove the three bolts attaching the exhaust 
manifold outer heat shield (1) to the exhaust manifold 
(2). 

 

Figure 6A1 – 57 

Engine Mechanical – V6 

Page 6A1–92 

 

Page 6A1–92 

9 

Progressively loosen the seven exhaust manifold 
attaching bolts (2), working from the outside to the 
centre and then remove the bolts. 

10 

Manoeuvre the exhaust manifold (3), away from the 
cylinder head. 

11 

Remove and discard the exhaust manifold to cylinder 
head gasket. 

 

 

 

Figure 6A1 – 58 

12 

Remove the three bolts (1), attaching the exhaust 
manifold inner heat shield to the exhaust manifold. 

 

13 

Using a suitable commercially available non-corrosive 
cleaning solvent and a soft bristled parts cleaning 
brush, thoroughly clean the exhaust manifold. 

14 

Dry the exhaust manifold using compressed air. 

 

Safety glasses must be worn when using 
compressed air. 

 

Figure 6A1 – 59 

N O T E  

•  The same procedure applies to the Right-

hand exhaust manifold. 

 

•  To gain access to the lower rear exhaust 

manifold attaching bolts (2), apply a slight 
downward movement to the coolant inlet 
pipe (1). 

 

 

Engine Mechanical – V6 

Page 6A1–93 

 

Page 6A1–93 

Inspect 

Inspect the exhaust manifold (1) for the following: 
• 

Damage to the threaded holes for the heat shield 
mounting. 

• 

Damage to the exhaust manifold mounting holes. 

• 

Damage to the threads of the exhaust manifold to 
exhaust pipe flange studs. 

• 

Damage to the gasket sealing surfaces. 

• 

Using a straight edge (2) and feeler gauges (3), check 
the cylinder head mounting face of the exhaust 
manifold does not exceed the maximum distortion 
specification of 0.25mm. 

N O T E  

If the surface flatness is not within 
specifications, the exhaust manifold is warped 
and must be replaced. 

 

Figure 6A1 – 60 

Reinstall 

Reinstallation of the exhaust manifold assembly is the reverse of the removal procedure, noting the following: 

1 

Ensure the exhaust manifold, cylinder head and exhaust pipe flange surfaces are clean. 

2 

Position a new exhaust manifold gasket onto the exhaust manifold. 

3 

Apply a 5 mm bead of Loctite 272 thread sealant (or equivalent) to the threads of the exhaust manifold attaching 
bolts. 

4 

Install the bolts into the exhaust manifold. This will prevent the gasket from falling off the manifold. 

5 

Manoeuvre the exhaust manifold into position and install the exhaust manifold attaching bolts. 

6 

From underneath the vehicle install the exhaust manifold to exhaust pipe flange nuts. 

7 

Tighten the exhaust manifold attaching bolts to the correct torque specification. 

N O T E  

When tightening the exhaust manifold to cylinder 
head attaching bolts, begin with the centre bolts, 
then alternate from side to side to the outer bolts. 

Exhaust manifold to cylinder head 
attaching bolt torque specification...........17.0 – 23.0 Nm 

8 

Apply an anti seize compound such as Caltex Kopr-Kote (or equivalent) to the cleaned heat shield bolt threads. 
Install the heat shield attaching bolts and tighten to the correct torque specification. 

Exhaust manifold heat shield attaching  
bolt torque specification ............................8.0 – 12.0 Nm 

9 

For the right-hand side, install the battery harness ground cable attaching nut through the ground terminal and 
lower coolant tube mounting lug, and tighten to the correct torque specification. 

Battery harness ground terminal 
attaching nut torque specification.......................13.0 Nm 

Engine Mechanical – V6 

Page 6A1–94 

 

Page 6A1–94 

3.12 Camshaft 

Cover 

Remove 

1 

Remove the intake manifold assembly, refer to 

3.10  Intake Manifold Assembly – Complete

. 

2 

For the left-hand side, remove the evaporative (EVAP) emission canister purge solenoid, refer to  

Section 6C1-3 Engine Management – V6 – Service Operations

. 

3 

Remove the two bolts (1) attaching the engine wiring 
harness former to the rear of the cylinder heads. 

4 

Unclip the transmission vent tube (2) from the engine 
wiring harness. 

 

Figure 6A1 – 61 

5 

Disconnect the oxygen sensor wiring harness 
connector (1) from the engine wiring harness (2), left-
hand shown, right-hand similar. 

 

Figure 6A1 – 62