Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 578

6A – 150 ENGINE MECHANICAL

25. Cooling Fan Pulley

1) Install the cooling fan pulley to the water pump with

spacer.

2) Tighten the cooling fan pulley bolts to the specified

torque.

Cooling Fan Pulley Bolt Torque

kg·m (lb.ft/N·m)

0.8

± 0.2 (5.8 ± 1.4/7.8 ± 2.0)

26. Cooling Fan Drive Belt

Install the fan drive belt and adjust the belt tension
referring SERVICING of this section.

EGR Pipe (If equipped)

Install EGR pipe and tighten fixing bolt and nuts to the
specified torque.
Bolt kg·m

(lb.ft/N·m)

2.7

± 0.5 (19.5 ± 3.6/26.5 ± 4.9)

Nuts kg·m

(lb.ft/N·m)

2.4

± 0.5 (17.4 ± 3.6/23.5 ± 4.9)

027RY00007

ENGINE MECHANICAL 6A – 151

LUBRICATING SYSTEM

MAIN DATA AND SPECIFICATIONS

Engine Model

4JA1, 4JA1T

4JB1T, 4JG2T, 4JA1TC,

4JH1TC

Oil pump type
Oil pressure switch operating pressure

kg/cm

2

(psi/kPa)

Oil

filter

type

Gear

0.2 – 0.5 (2.8 – 7.1/19.6 – 49.0)

Full flow with cartridge paper element

Relief valve opening pressure

kg/cm

2

(psi/kPa)

4.3 – 4.7

(61.1 – 66.8/421.4 – 460.6)

5.7 – 6.3

(82.5 – 89.5/558.6 – 617.4)

Safety valve opening pressure

kg/cm

2

(psi/kPa)

Oil cooler type
Safety valve opening pressure

kg/cm

2

(psi/kPa)

0.8 – 1.2 (11.38 – 17.07/78.9 – 117.6)

Water-cooled

2.3 – 2.7 (32.7 – 38.4/225.4 – 264.6)

6A – 152 ENGINE MECHANICAL

GENERAL DESCRIPTION

LUBRICATING OIL FLOW

Except
4JA1

ENGINE MECHANICAL 6A – 153

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Oil filter safety valve opening pressure : 0.8 – 1.2 (11.4 – 17.1/78.9 – 117.6)

‚

Oil cooler safety valve opening pressure : 2.3 – 2.7 (32.7 – 38.4/225.4 – 264.6)

ƒ

Oil filter relief valve opening pressure : 5.7 – 6.3 (82.5 – 89.5/558.6 – 617.4)

„

Oil pressure switch opening pressure : 0.2 – 0.5 (2.8 – 7.1/19.6 – 49.0)

Engine regulating valve : 2.3 – 2.7 (32.7 – 38.4/225.4 – 264.6)

†

Oil pump relief valve opening pressure : 6.7 – 7.8 (95.3 – 110.9/657.0 – 764.9)

C06L200010

The 4J series engine has a full flow type lubricating system.
Lubricating oil is pumped from the oil pump to the cylinder body oil gallery through the oil cooler and the oil filter. It is
then delivered to the vital parts of the engine from the cylinder body oil gallery.
Oiling jets installed on the cylinder body spray engine oil to the piston backside faces to achieve maximum piston
cooling effect.

4JA1TC,
4JH1TC