Isuzu engine 4j series. Manual — part 7

SERVICE INFORMATION 00 – 27

Checkpoint

Trouble Cause

Countermeasure

Oil level

Too low

Correct

Contaminated

Replace oil

Turbocharger oil feed pipe

Restricted

Repair or replace

Turbine housing

Carbon deposits

Clean

Compressor housing

Dirty

Clean

Turbine shaft bearings

Worn

Replace

OK

OK

OK

OK

OK

NG

NG

NG

NG

NG

NG

Continued from the previous page

00 – 28

SERVICE INFORMATION

5) EXCESSIVE ROTATING PART WEAR

Checkpoint

Trouble Cause

Countermeasure

Engine oil

Contaminated

Change

Wrong grade or type

Change

Turbocharger oil feed pipe

Restricted

Clean or replace

Turbocharger oil seal

Defective

Replace

Center housing oil

drain passage

Restricted

Clean or replace

Turbine shaft

Oil sludge and coking

Replace

Engine lubrication system

Inadequate oil supply

Correct

OK

OK

OK

OK

OK

NG

NG

NG

NG

NG

NG

NG

SERVICE INFORMATION 00 – 29

LUBRICATION CHART

The 4J Series engine lubricating system is a full flow type.
Lubricating oil is pumped from the oil pump to the cylinder body oil gallery through the oil cooler and the oil filter
(replaceable type oil filters have on oil cooler). It is then delivered to the vital parts of the engine from the cylinder
body oil gallery.

4JB1, 4JB1TC, 4JG2, Oil Filter & Oil Cooler

kPa (Kg/cm

2

/psi)

!

Oil filter relief valve opening pressure

:

559 - 0618 (5.7 - 6.3/81 - 90)

"

Oil cooler safety valve opening pressure

:

314 - 373 (3.2 - 3.8/46 - 54)

#

Oil filter safety valve opening pressure

:

78 - 118 (0.8 - 1.2/11 - 19)

$

Oil pressure switch opening pressure

:

29.4 - 49.0 (0.3 - 0.5/4.3 - 7.1)

Lubu Chart 5J.tif

00 – 30

SERVICE INFORMATION

MAIN DATA AND SPECIFICATIONS

MAIN DATA AND SPECIFICATIONS

Item

Engine Model

4JB1 / 4JB1T / 4JB1TC

4JG2 (G. EXP & EC)

Engine type

Four-cycle, overhead valve, water cooled

Combustion chamber type

Direct injection

In direct injection

Cylinder liner type

Dry type, chrome plated, stainless steel tube

Timing train system

Gear drive

Gear and Belt Drive

No. of cylinders - Bore x stroke mm (in)

4 - 93 x 102

(3.66 x 4.02)

4 - 95.4 x 107

(3.76 x 4.21)

No. of piston rings

Compression rings: 2 / Oil ring: 1

Total piston displacement

cm

3

(in

3

)

2,771 (169.0)

3,059 (186.6)

Compression ratio (to 1)

18.2 (4JB1)

18.1 (4JB1T/4JB1TC)

20.1

Compression pressure

kPa (kg/cm

2

/psi)

3,038 (31 / 441)

3,334 (34 / 483.8)

(For EC 2,363 (24.1 / 531))

Engine weight (Dry)

N (kg/lb)

Approximately

2,245 (229 / 505) (4JB1)

2,511 (256 / 564)

(4JB1T/4JB1TC)

Approximately

2,403 (245 / 540)

Fuel injection order

1 - 3 - 4 - 2

Fuel injection timing

deg

BTDC 14 (4JB1)

BTDC 12 (’91/542A) (4JB1)

BTDC 11 (4JB1T)

BTDC 4 (4JB1TC)

ATDC 1 (Belt ’91/542A)

TDC 0° (Belt ’91/542B)

ATDC 2 (Gear ’91/542A)

Specified fuel type

SAE No. 2 diesel fuel

Idling speed

rpm

750 - 790

700 – 740

Valve clearances (At cold): Intake

mm(in)

0.40 (0.016)

Exhaust mm(in)

0.40 (0.016)

Valve clearances (At hot): Intake

mm(in)

0.45 (0.018)

Exhaust mm(in)

0.45 (0.018)

Intake valves

Open at (BTDC) deg

24.5

Close at (ATDC) deg

55.5

Exhaust valves

Open at (BTDC) deg

54

Close at (ATDC) deg

26

NOTE:

G.EXP

: General Export Model

EC

: European

Countries

Emission Gas Control Standard
’91/542A : Euro

1

’91/542B : Euro

2