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Service Manual Trucks D12B free [Specifications D12B-345 D12B-385 D12B-425]

Specifications

Specifications: D12B D12B-345 D12B-385 D12B-425

Foreword

The descriptions and service procedures contained in this manual are based on de[1]signs and methods studies carried out up to February 98. The products are under continuous development. Vehicles and components produced after the above date may therefore have different specifications and repair methods. When this is believed to have a significant bearing on this manual, supplementary ser[1]vice bulletins will be issued to cover the changes. The new edition of this manual will update the changes. In service procedures where the title incorporates an operation number, this is a refer[1]ence to an S.R.T. (Standard Repair Time). Service procedures which do not include an operation number in the title are for gen[1]eral information and no reference is made to an S.R.T. The following levels of observations, cautions and warnings are used in this Service Documentation: Note: Indicates a procedure, practice, or condition that must be followed in order to have the vehicle or component function in the manner intended. Caution: Indicates an unsafe practice where damage to the product could occur. Warning: Indicates an unsafe practice where personal injury or severe damage to the product could occur. Danger: Indicates an unsafe practice where serious personal injury or death could oc[1]cur

Engine Designation

Volvo D12B-385

Type designation ……………………………………………………………………. D12B-345
D12B-385
D12B-425
Max. output at 1700 rpm (28.3 r/s)
D12B-345 …………………………………………………………………………….. 257 kW 345 bhp
D12B-385 ……………………………………………………………………………… 287 kW 385 bhp
D12B-425 ……………………………………………………………………………… 317 kW 425 bhp
Max. torque at 1200 rpm (20.0 r/s)
D12B-345 …………………………………………………………………………….. 1850 Nm (1350 ft-lb)
D12B-385 …………………………………………………………………………….. 1965 Nm (1450 ft-lb)
D12B-425 …………………………………………………………………………….. 2100 Nm (1550 ft-lb)
Number of cylinders ……………………………………………………………….. 6
Bore ……………………………………………………………………………………… 131 mm (5.2 in.)
Stroke …………………………………………………………………………………… 150 mm (5.9 in.)
Displacement …………………………………………………………………………. 12.13 liters (740 in3)
Compression ratio ………………………………………………………………….. 17.5:1
Firing sequence ……………………………………………………………………… 1-5-3-6-2-4
Low idle ………………………………………………………………………………… 500-650 rpm (8.3-10.8 r/s)
High idle ……………………………………………………………………………….. 2100 +0/-40 rpm (35 +0/-0.7 r/s)
Max. full load speed ……………………………………………………………….. 1900 rpm (31.6 r/s)
Weight, engine with flywheel, flywheel housing and starter (dry) …. 1060 kg (2332 lb)
Max. length ……………………………………………………………………………. 1348 mm (53 in.)
Max. width …………………………………………………………………………….. 780 mm (30.7 in.)
Max. height ……………………………………………………………………………. 1138 mm (44.8 in.

Engine
Cylinder Head

Type …………………………………………………………………………………………….. 6 cylinder
Length ………………………………………………………………………………………….. 1076 mm (42.36 in.)
Width …………………………………………………………………………………………… 373 mm (14.68 in.)
Height …………………………………………………………………………………………. 135 mm (5.31 in.)

Cylinder Head Bolts

Number …………………………………………………………………………………… 38
Thread size ……………………………………………………………………………… M16
Length …………………………………………………………………………………….. 200 mm (7.87 in.)

Cylinder Block

D12B-345

Height, upper block face-crankshaft center (A) min. ……………………. 422 mm (16.61 in.)
Height, lower block face-crankshaft center (B) min. …………………….. 120 mm (4.72 in.)
Cylinder Liner
Type ………………………………………………………………………………………. Wet, replaceable
Sealing surface height above block face (protrusion) …………………… 0.15–0.20 mm (0.0059–0.0078 in.)
Liner height variance between all cylinders ………………………………… 0.05 mm (0.002 in.)
Number of O-rings, cylinder liner ………………………………………………. 4

Pistons

Height above cylinder block face ………………………………………………. 0.15-0.65 mm (0.0059–0.0255 in.)
Diameter, combustion chamber ………………………………………………… 86 mm (3.38 in.)
Depth, piston ball ……………………………………………………………………. 19.7 mm (0.775 in.)
Number of ring grooves …………………………………………………………… 3
Front marking …………………………………………………………………………. Arrow pointing forward

Piston Rings
Compression Rings

Number ………………………………………………………………………………….. 2
Piston ring clearance in groove:
Upper compression ring …………………………………………. Keystone
Lower compression ring …………………………………………. 0.070–0.102 mm (0.0027–0.004 in.)
Piston ring gap measured in ring opening:
Upper ring ……………………………………………………………. 0.40–0.65 mm (0.015–0.0255 in.)
Lower ring ……………………………………………………………. 0.8–1.0 mm (0.031–0.039 in.)
Oil Scraper Ring
Number …………………………………………………………………………………. 1
Width, including spring ……………………………………………………………. 4.88 mm (0.192 in.)
Piston ring clearance in groove …………………………………………………. 0.050–0.082 mm (0.0019–0.0032 in.)
Piston ring gap measured in ring opening …………………………………. 0.40–0.75 mm (0.0157–0.0295 in.)

Valve Mechanism
Valves

D12B-385

 

Valve disc diameter:

Intake …………………………………………………………………… 40 ± 0.1 mm (1.57 ± 0.0039 in.)
Exhaust ……………………………………………………………….. 40 ± 0.1 mm (1.57 ± 0.0039 in.)
Valve stem diameter:
Intake …………………………………………………………………… 7.964–7.975 mm (0.3135–0.3140 in.)
Exhaust ……………………………………………………………….. 7.951–7.962 mm (0.313–0.3135 in.)
Valve seat angle:
Intake …………………………………………………………………… 29.5
Exhaust ……………………………………………………………….. 44.5
Valve disc edge:
Intake …………………………………………………………………… 1.76 mm (0.069 in.)
Exhaust ……………………………………………………………….. 1.57 mm (0.061 in.)
Seat angle in cylinder head:
Intake …………………………………………………………………… 30
Exhaust ……………………………………………………………….. 45
Valve clearance, cold engine, setting value:
Intake …………………………………………………………………… 0.2 mm (0.0078 in.)
Exhaust ……………………………………………………………….. 0.5 mm (0.0196 in.)
Exhaust, with VEB ………………………………………………… 1.6 mm (0.0629 in.)
Valve clearance, cold engine, checking value:
Intake …………………………………………………………………… 0.15–0.25 mm (0.0059–0.0098 in.)
Exhaust ……………………………………………………………….. 0.45–0.55 mm (0.0177–0.0216 in.)
Exhaust, with VEB ………………………………………………… 1.55–1.65 mm (0.061–0.065 in.)

Valve Seat

D12B-425

Outer diameter (meas. A) standard :
Intake ………………………………………………………………….. 43.070–43.086 mm (1.695–1.696 in.)
Exhaust ………………………………………………………………. 43.070–43.086 mm (1.695–1.696 in.)
Oversize:
Intake ………………………………………………………………….. 43.270–43.286 mm (1.703–1.704 in.)
Exhaust ………………………………………………………………. 43.270–43.286 mm (1.703–1.704 in.)
Height (meas. B):
Intake ………………………………………………………………….. 8.5–8.7 mm (0.335–0.343 in.)
Exhaust ………………………………………………………………… 8.4-8.6 mm (0.331-0.339 in.)

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Service Manual Trucks D12B free [Specifications D12B-345 D12B-385 D12B-425]

Specifications

Specifications: D12B D12B-345 D12B-385 D12B-425

Foreword

The descriptions and service procedures contained in this manual are based on de[1]signs and methods studies carried out up to February 98. The products are under continuous development. Vehicles and components produced after the above date may therefore have different specifications and repair methods. When this is believed to have a significant bearing on this manual, supplementary ser[1]vice bulletins will be issued to cover the changes. The new edition of this manual will update the changes. In service procedures where the title incorporates an operation number, this is a refer[1]ence to an S.R.T. (Standard Repair Time). Service procedures which do not include an operation number in the title are for gen[1]eral information and no reference is made to an S.R.T. The following levels of observations, cautions and warnings are used in this Service Documentation: Note: Indicates a procedure, practice, or condition that must be followed in order to have the vehicle or component function in the manner intended. Caution: Indicates an unsafe practice where damage to the product could occur. Warning: Indicates an unsafe practice where personal injury or severe damage to the product could occur. Danger: Indicates an unsafe practice where serious personal injury or death could oc[1]cur

Engine Designation

Volvo D12B-385

Type designation ……………………………………………………………………. D12B-345
D12B-385
D12B-425
Max. output at 1700 rpm (28.3 r/s)
D12B-345 …………………………………………………………………………….. 257 kW 345 bhp
D12B-385 ……………………………………………………………………………… 287 kW 385 bhp
D12B-425 ……………………………………………………………………………… 317 kW 425 bhp
Max. torque at 1200 rpm (20.0 r/s)
D12B-345 …………………………………………………………………………….. 1850 Nm (1350 ft-lb)
D12B-385 …………………………………………………………………………….. 1965 Nm (1450 ft-lb)
D12B-425 …………………………………………………………………………….. 2100 Nm (1550 ft-lb)
Number of cylinders ……………………………………………………………….. 6
Bore ……………………………………………………………………………………… 131 mm (5.2 in.)
Stroke …………………………………………………………………………………… 150 mm (5.9 in.)
Displacement …………………………………………………………………………. 12.13 liters (740 in3)
Compression ratio ………………………………………………………………….. 17.5:1
Firing sequence ……………………………………………………………………… 1-5-3-6-2-4
Low idle ………………………………………………………………………………… 500-650 rpm (8.3-10.8 r/s)
High idle ……………………………………………………………………………….. 2100 +0/-40 rpm (35 +0/-0.7 r/s)
Max. full load speed ……………………………………………………………….. 1900 rpm (31.6 r/s)
Weight, engine with flywheel, flywheel housing and starter (dry) …. 1060 kg (2332 lb)
Max. length ……………………………………………………………………………. 1348 mm (53 in.)
Max. width …………………………………………………………………………….. 780 mm (30.7 in.)
Max. height ……………………………………………………………………………. 1138 mm (44.8 in.

Engine
Cylinder Head

Type …………………………………………………………………………………………….. 6 cylinder
Length ………………………………………………………………………………………….. 1076 mm (42.36 in.)
Width …………………………………………………………………………………………… 373 mm (14.68 in.)
Height …………………………………………………………………………………………. 135 mm (5.31 in.)

Cylinder Head Bolts

Number …………………………………………………………………………………… 38
Thread size ……………………………………………………………………………… M16
Length …………………………………………………………………………………….. 200 mm (7.87 in.)

Cylinder Block

D12B-345

Height, upper block face-crankshaft center (A) min. ……………………. 422 mm (16.61 in.)
Height, lower block face-crankshaft center (B) min. …………………….. 120 mm (4.72 in.)
Cylinder Liner
Type ………………………………………………………………………………………. Wet, replaceable
Sealing surface height above block face (protrusion) …………………… 0.15–0.20 mm (0.0059–0.0078 in.)
Liner height variance between all cylinders ………………………………… 0.05 mm (0.002 in.)
Number of O-rings, cylinder liner ………………………………………………. 4

Pistons

Height above cylinder block face ………………………………………………. 0.15-0.65 mm (0.0059–0.0255 in.)
Diameter, combustion chamber ………………………………………………… 86 mm (3.38 in.)
Depth, piston ball ……………………………………………………………………. 19.7 mm (0.775 in.)
Number of ring grooves …………………………………………………………… 3
Front marking …………………………………………………………………………. Arrow pointing forward

Piston Rings
Compression Rings

Number ………………………………………………………………………………….. 2
Piston ring clearance in groove:
Upper compression ring …………………………………………. Keystone
Lower compression ring …………………………………………. 0.070–0.102 mm (0.0027–0.004 in.)
Piston ring gap measured in ring opening:
Upper ring ……………………………………………………………. 0.40–0.65 mm (0.015–0.0255 in.)
Lower ring ……………………………………………………………. 0.8–1.0 mm (0.031–0.039 in.)
Oil Scraper Ring
Number …………………………………………………………………………………. 1
Width, including spring ……………………………………………………………. 4.88 mm (0.192 in.)
Piston ring clearance in groove …………………………………………………. 0.050–0.082 mm (0.0019–0.0032 in.)
Piston ring gap measured in ring opening …………………………………. 0.40–0.75 mm (0.0157–0.0295 in.)

Valve Mechanism
Valves

D12B-385

 

Valve disc diameter:

Intake …………………………………………………………………… 40 ± 0.1 mm (1.57 ± 0.0039 in.)
Exhaust ……………………………………………………………….. 40 ± 0.1 mm (1.57 ± 0.0039 in.)
Valve stem diameter:
Intake …………………………………………………………………… 7.964–7.975 mm (0.3135–0.3140 in.)
Exhaust ……………………………………………………………….. 7.951–7.962 mm (0.313–0.3135 in.)
Valve seat angle:
Intake …………………………………………………………………… 29.5
Exhaust ……………………………………………………………….. 44.5
Valve disc edge:
Intake …………………………………………………………………… 1.76 mm (0.069 in.)
Exhaust ……………………………………………………………….. 1.57 mm (0.061 in.)
Seat angle in cylinder head:
Intake …………………………………………………………………… 30
Exhaust ……………………………………………………………….. 45
Valve clearance, cold engine, setting value:
Intake …………………………………………………………………… 0.2 mm (0.0078 in.)
Exhaust ……………………………………………………………….. 0.5 mm (0.0196 in.)
Exhaust, with VEB ………………………………………………… 1.6 mm (0.0629 in.)
Valve clearance, cold engine, checking value:
Intake …………………………………………………………………… 0.15–0.25 mm (0.0059–0.0098 in.)
Exhaust ……………………………………………………………….. 0.45–0.55 mm (0.0177–0.0216 in.)
Exhaust, with VEB ………………………………………………… 1.55–1.65 mm (0.061–0.065 in.)

Valve Seat

D12B-425

Outer diameter (meas. A) standard :
Intake ………………………………………………………………….. 43.070–43.086 mm (1.695–1.696 in.)
Exhaust ………………………………………………………………. 43.070–43.086 mm (1.695–1.696 in.)
Oversize:
Intake ………………………………………………………………….. 43.270–43.286 mm (1.703–1.704 in.)
Exhaust ………………………………………………………………. 43.270–43.286 mm (1.703–1.704 in.)
Height (meas. B):
Intake ………………………………………………………………….. 8.5–8.7 mm (0.335–0.343 in.)
Exhaust ………………………………………………………………… 8.4-8.6 mm (0.331-0.339 in.)

Download the full document here.

The list of Volvo software you can refer to here.

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