Removing and installing delivery unit for reducing agent metering system GX19 — VW

Removing and installing
delivery unit for reducing agent metering system
GX19
Special tools and workshop equipment required
Torque wrench
V.A.G 1783
Engine bung set
VAS 6122
Removing
Emptying tank for reducing agent
Chapter
.
Remove reducing agent tank
Chapter
.
Place tank for reducing agent on a clean surface with delivery module facing upwards.
Clean area around delivery module.
CAUTION
Risk of injury from escaping reducing agent
The reducing agent may cause eye and skin irritations as well as injuries to the respiratory system and poisoning.
Wear eye protection.
Wear protective gloves.
Always wear protective clothes.
Make sure that a sufficient amount of fresh air is supplied. In closed areas, switch on the exhaust gas extractor system.
Disconnect connectors
1
and
3
.
Separate delivery line
2
.
Place a cloth underneath separating point to catch any escaping reducing agent.
Seal off all open lines and connections with clean plugs from
engine bung set
VAS 6122
.
Remove bolts
arrows
.
Carefully lever out delivery module
5
at recess
4
.
Pull out delivery module
5
from reducing agent tank.
Installing
Installation is carried out in the reverse order; note the following:
Do not clean the delivery module for reducing agent with compressed air.
All components must be dry when installing them.
Moisten seals with a suitable lubricant before installing
Electronic Parts Catalogue
.
Clean all components and connections with water and a lint-free cloth.
Renew dampers, spacer sleeves and seals.
Fit delivery module for reducing agent, and push it into mounting without canting.
Apply the required force over the entire surface.
Note
There are letters indicated on the supply unit at the tank for reducing agent.
The letters
S1 to S3
denote the tightening sequence.
Tighten the delivery module as follows:
Renew bolts.
Tightening sequence
Designation of bolts on supply unit
Position of bolt
Specified torque
1.
S1
Bolt with largest distance to seal
2.
S2
Bolt with medium distance to seal
6 Nm
3.
S3
Bolt with smallest distance to seal
Connect
Vehicle diagnostic tester
.
Switch ignition on.
Adapt SCR system learnt values
Vehicle diagnostic tester
,
01 - Systems capable of self-diagnosis
,
01 - Diesel direction injection and preglow system EDC 17
,
01 - Engine electronics functions
,
01 - Adapting SCR system learnt values
.
Follow further instructions displayed on
Vehicle diagnostic tester
.
Specified torques
Chapter
“
Assembly overview - delivery module for reducing agent
”
Chapter
“
Assembly overview - tank for reducing agent
”