Volvo Engine Brake VE D12, D12A, D12B. Manual - part 13

Group 25

Service Procedures

CAUTION

With older engines, avoid damage to the valve cover
and injector cable harness by making sure the mount-
ing screws do not unscrew from the cylinder head
during removal. Do not use impact tools to remove
the nuts securing the valve cover.

3
Clean the area round the solenoid
valve.

T2007731

Remove the electrical connections
from the solenoid valve.

T2007732

Remove the mounting bolt and flange.
Lift off the old solenoid valve.

Note: Check that the drain channel in
the VEB control valve is not clogged.

T2007736

Install the new solenoid valve, flange,
and mounting bolt.

Note: The solenoid mounting angle is
important. The terminals of the sole-
noid should be at a 0 to 45

angle to

the VEB control valve oil pipe.
Torque the solenoid mounting screw to
12.2 Nm (9 ft-lb).

12.2 Nm
(9 ft-lb)

Group 25

Service Procedures

T2007733

Connect the electrical cables to the
solenoid valve and tighten the nuts to
a torque of 1.4 Nm (1 ft-lb).

1.4 Nm
(1 ft-lb)

8
Install the valve cover.

T2007003

Tighten the valve cover nuts to 30 ± 3
Nm (22 ± 2 ft-lb). Follow the tightening
sequence shown.

30 ± 3 Nm
(22 ± 2 ft-lb)

10
Test run engine and check for oil leaks.

2531-03-02-02
Control Valve, Engine Brake,
Replacement

Before working on a vehicle, set the parking brakes,
place the transmission in neutral, and block the
wheels. Failure to do so can result in unexpected ve-
hicle movement and can cause serious personal
injury or death.

WARNING

HOT ENGINE! Keep yourself and your test equipment
clear of all moving or hot engine parts. A hot engine
can cause serious burns or can permanently damage
test equipment.

WARNING

Always wear appropriate eye protection to prevent the
risk of eye injury due to contact with engine debris or
fluids.

1
Set the parking brake.

T2006731

Remove the valve cover.

Note: With older engines, avoid
damage to the valve cover and injector
cable harness by making sure the
mounting screws do not unscrew from
the cylinder head during removal. Do
not use impact tools to remove the
nuts securing the valve cover.

3
Clean the area around the solenoid
valve.

Group 25

Service Procedures

T2007731

Remove the electrical connections
from the solenoid valve.

T2007722

Remove the valve cover stud located
beside the VEB control valve.

Note: Use Kent Moore tool J–41203 to
torque the studs on early D12 engines.

J–41203

T2007734

Loosen the attaching bolts and re-
move the control valve.
Also remove the oil pipe and seals be-
tween the control valve and rocker
arm shaft.

T2007794

Transfer the solenoid valve to the new
control valve, if it is to be re-used.
Torque the solenoid mounting screw to
12.2 Nm (9 ft-lb).

Note: Check that the drain holes in the
VEB solenoid valve are not clogged.
The solenoid mounting angle is impor-
tant. The terminals of the solenoid
should be at a 0 to 45

angle to the

VEB control valve oil pipe.

12.2 Nm
(9 ft-lb)

Group 25

Service Procedures

T2007734

Install new seals on the pipe between
the control valve and rocker arm shaft.
Press the pipe (together with the seal)
into the control valve. Install a new
seal in the control valve oil inlet hole
where it mates with the cylinder head.

Install and bolt down the control valve.
Make sure that the seals against the
cylinder head and rocker arm shaft are
positioned correctly.

Torque the control valve mounting
bolts to 20 ± 3 Nm (15 ± 2 ft-lb).

20 ± 3 Nm
(15 ± 2 ft-lb)

T2007723

Clean the threaded hole in the cylinder
head located beside the VEB control
valve. Clean the valve cover stud bolt
and apply locking fluid. Torque the
stud to 48 ± 8 Nm (35 ± 6 ft-lb).

Note: Use Kent Moore tool J–41203 to
torque the studs on early D12 engines.
Carefully remove any excess locking
fluid after the stud bolt has been tight-
ened.

J–41203
48 ± 8 Nm
(35 ± 6 ft-lb)

T2007733

Connect the electrical cables to the
solenoid valve and tighten the nuts to
a torque of 1.4 Nm (1 ft-lb).

1.4 Nm
(1 ft-lb)

11
Press the electrical cable clamp onto
the stud bolt.

Note: The electrical cable must be po-
sitioned on the outside of the valve
cover stud.

12
Install the valve cover.

T2007003

Tighten the valve cover nuts to 30 ± 3
Nm (22 ± 2 ft-lb). Follow the tightening
sequence shown.

30 ± 3 Nm
(22 ± 2 ft-lb)

14
Test run engine and check for oil leaks.

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