Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 1722

6G-2  ENGINE LUBRICATION

General Description

Legend

1 Oil Strainer
2 Oil Pump
3 Relief Valve
4 Oil Filter
5 Safety Valve
6 Oil Gallery
7 Crankshaft Bearing
8 Crankshaft

9 Connecting Rod Bearing

10 Connecting Rod
11 Piston
12 Oil Gallery; Cylinder Head
13 Camshaft
14 Camshaft Journal
15 HLV
16 Check relief valve
17 Oil Pan

A gear-type oil pump is directly driven by the crankshaft and
draws oil from the oil pan, via the suction pipe. If then passes
the pressured oil through a full-flow disposable oil filter, to the
main oil gallery in the cylinder Block. An oil pump pressure
relief valve and oil filter bypass valve are incorporated in the
system.
From the main oil gallery in the cylinder block, the cylinder
head and crankshaft main bearings are supplied with oil.
The camshaft bearings and hydraulic tappets are supplied
through the main feed galleries in the cylinder head. Vent
valves allow air to be expelled from the oil galleries in the
cylinder head. The balance shaft journals are directly fed from
the crankshaft main bearings. The connecting rod bearings are
fed via passages in the crankshaft. The oil returns to the oil
pan via passages in the cylinder block.

ENGINE LUBRICATION  6G-3

Service Precaution

CAUTION:
Always use the correct fastener in the proper location.
When you replace a fastener, use ONLY the exact part
number for that application. ISUZU will call out those
fasteners that require a replacement after removal. ISUZU
will also call out the fasteners that require thread lockers
or thread sealant. UNLESS OTHERWISE SPECIFIED, do
not use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or fastener
joint interfaces. Generally, such coatings adversely affect
the fastener torque and the joint clamping force, and may
damage the fastener. When you install fasteners, use the
correct tightening sequence and specifications. Following
these instructions can help you avoid damage to parts and
systems.

6G-4  ENGINE LUBRICATION

Oil Pump

Oil Pump and Associated Parts

Legend

1 Oil Pump Assembly
2 Oil Pressure Switch

3 Gasket
4 Sleeve

Disassembly

1. Remove crankshaft timing pulley.

2. Remove oil pan.

3. Remove oil strainer.

4. Remove oil pump assembly.

5. Remove oil pressure switch.

6. Remove gasket.

7. Remove sleeve.

ENGINE LUBRICATION  6G-5

Inspection and Repair

CAUTION: Make necessary correction or parts
replacement if wear, damage or any other abnormal
conditions are found through inspection.

Body and Gears

The pump assembly must be replaced if one or more of the
conditions below is discovered during inspection:
Indentation of gear pair - Use feeler strip and straight edge.

Dimension: 0.03 mm to 0.10 mm

(0.0012 to 0.0039 in)

Oil Strainer

Check the oil strainer for cracking and scoring. If cracking and
scoring are found, the oil strainer must be replaced.

Reassembly

1. Install oil pressure switch to the oil pump.

Torque: 40 N

⋅⋅⋅⋅m (4.1 kgf⋅⋅⋅⋅m)

2. Install the oil pump with the sleeve and the gasket.

Torque: 6 N

⋅⋅⋅⋅m (0.6 kgf⋅⋅⋅⋅m)

3. Install oil strainer.

Torque: 8 N

⋅⋅⋅⋅m (0.8 kgf⋅⋅⋅⋅m)

4. Install the oil pan.

Tighten the bolts:

15 N

⋅⋅⋅⋅m (1.5 kgf⋅⋅⋅⋅m)

5. Install crankshaft timing pulley.

Tighten the bolts:

20 N

⋅⋅⋅⋅m (2.0 kgf⋅⋅⋅⋅m)