Isuzu 4LB1, 4LC1, 4LE1 diesel engine manuals, specs and bolt torques

4LB1 engine
Main bearing cap Bolts
Step 1 = 20 Nm, 15 lb.ft
Step 2 = 50 Nm, 35 lb.ft
Step 3 = 90 Nm, 66 lb.ft
Con Rod Bolts
41 Nm, 30 lb.ft

Cylinder Head Bolts M12
Step 1 = 90 Nm, 66 lb.ft
Step 2 = + 60 to 90 degrees
Cylinder Head Bolts M8
25-34 Nm, 18-25 lb.ft

4LC1 engine
Main bearing cap Bolts
Step 1 = 20 Nm, 15 lb.ft
Step 2 = 50 Nm, 35 lb.ft
Step 3 = 90 Nm, 66 lb.ft
Con Rod Bolts
step 1 = 27 Nm, 20 lb.ft
step 2 = + 100-115 degrees
Cylinder Head Bolts M12
Step 1 = 90 Nm, 66 lb.ft
Step 2 = + 60 to 90 degrees
Cylinder Head Bolts M8
25-34 Nm, 18-25 lb.ft

4LE1 engine
Main bearing cap Bolts
Step 1 = 20 Nm, 15 lb.ft
Step 2 = 50 Nm, 35 lb.ft
Step 3 = 90 Nm, 66 lb.ft
Con Rod Bolts
82 Nm, 60 lb.ft

Cylinder Head Bolts M12
Step 1 = 90 Nm, 66 lb.ft
Step 2 = + 60 to 90 degrees
Cylinder Head Bolts M8
25-34 Nm, 18-25 lb.ft

4LB1 engine
Type
4 cylinder in-line
water cooled
OHV
Bore, stroke
77.4 × 79.7 mm
displacement
1499 ml
compression ratio
22:1
Power naturally aspirated
24 kW, 33 hp @3000 rpm
Power turbocharged
27 kW, 37 hp @2800 rpm
dimensions approx
length = 550 mm
width = 440-450 mm
height = 580-590 mm
weight approx
130-140 kg

4LC1 engine
Type
4 cylinder in-line
water cooled
OHV
Bore, stroke
77.4 × 92 mm
displacement
1731 ml
compression ratio
22:1
Power naturally aspirated
30 kW, 41 hp @3000 rpm


dimensions approx
length = 550 mm
width = 440 mm
height = 600 mm
weight approx
145 kg

4LE1 engine
Type
4 cylinder in-line
water cooled
OHV
Bore, stroke
85 × 92 mm
displacement
2179 ml
compression ratio
21.5:1
Power naturally aspirated
40 kW, 54 hp @3000 rpm


dimensions approx
length = 690 mm
width = 450 mm
height = 610 mm
weight approx
155 kg