Isuzu KB P190. Manual - part 654

Engine Mechanical – V6 

Page 6A1–137 

 

Disassemble 

CAUTION

 

There are no serviceable components within 
the oil pump. Disassemble the pump only to 
diagnose an oil related concern. A 
disassembled oil pump must not be reused: it 
must be replaced. 

1 

Remove the two bolts (1) attaching the primary timing 
chain lower guide (2) and remove the guide. 

 

CAUTION

 

The primary timing chain lower guide is not 
serviced separately and is part of the oil 
pump assembly. If it is removed from the 
pump assembly, the guide and the pump 
must be replaced. 

Figure 6A1 – 213 

2 

Remove the seven bolts (2) attaching the oil pump 
cover to the oil pump housing (1) and remove the 
cover from the housing. 

 

Figure 6A1 – 214 

Engine Mechanical – V6 

Page 6A1–138 

 

3 

Remove the inner gerotor ring (1). 

4 

Remove the outer gerotor ring (2). 

 

Figure 6A1 – 215 

5 

Remove the clip (1), retaining the oil relief valve cap 
(2). 

6 

Remove the cap, spring (3) and plunger (4) from the 
oil pump housing. 

 

Figure 6A1 – 216 

Clean 

1 

Clean the oil pump components with non-corrosive solvent. 

 

Safety glasses must be worn when using 
compressed air. 

2 

Dry the oil pump components with compressed air. 

Engine Mechanical – V6 

Page 6A1–139 

 

Inspect 

1 

Inspect the oil pump housing for damage. 

Figure 6A1 – 217 

2 

Inspect the oil pump cover for damage. 

 

Figure 6A1 – 218 

3 

Inspect the inner drive gear for damage. If inner 
surface damage is found, ensure the crankshaft is 
also inspected. 

 

Figure 6A1 – 219 

Engine Mechanical – V6 

Page 6A1–140 

 

4 

Inspect the outer driven gear for damage. 

 

Figure 6A1 – 220 

5 

Inspect the oil pump relief valve components for 
debris or damage. 

 

Figure 6A1 – 221 

6 

Inspect the primary camshaft chain lower guide for 
damage. If replacement of the primary camshaft chain 
lower guide is required, replace the entire oil pump 
assembly as the primary camshaft chain lower guide 
is not serviceable separately. 

7 

If debris or damage is present within the oil pump, 
further inspection of all of the engine components is 
required. 

 

Figure 6A1 – 222