Removing and installing SCR catalytic converters (vehicles compliant with EU 6 standard) — VW

Removing and installing SCR catalytic converters (vehicles compliant with EU 6 standard)
Special tools and workshop equipment required
Torque wrench (5…50 Nm)
V.A.G 1331
Removing:
WARNING
Risk of burns.
Parts of the exhaust system may be hot.
Allow exhaust system to cool before removing.
When doing any repair work, especially in the engine compartment, pay attention to the following due to the cramped conditions:
Route all the various lines (e.g. for fuel, hydraulics, activated charcoal filter system, coolant and refrigerant, brake fluid and vacuum) and electrical wiring in their original positions.
To avoid damage to lines, ensure sufficient clearance from all moving or hot components.
Cut through cable ties carefully and reinstall them in the same position.
Pull
NOx sender 2
G687
with
control unit for NOx sender 2
J881
off connector and therefore separating from line.
Push connection of delivery line
1
as far as stop onto
injector for reducing agent
N474
4
; then press securing clips
arrow
, and pull off connection. Seal open connections to prevent ingress of dirt.
Release and disconnect connector
2
.
Pull speed nut
1
off rear mounting for SCR catalytic converters.
Only vehicles with long exhaust system:
Pull speed nut
1
off rear exhaust pipe mounting
Item
.
Continuation for all vehicles:
Open and remove clip
1
.
Pull exhaust system together with SCR catalytic converters
2
towards rear out of mountings to remove.
Installing:
Installation is carried out in the reverse order. When installing, note the following:
Note
Make sure that the clamps are seated correctly.
Always renew clamps, seals and speed nuts.
After working on the exhaust system, ensure that the system is not under tension and that there is sufficient clearance to the bodywork. If necessary, loosen clamps, and align the front exhaust pipe so that sufficient clearance is maintained to the bodywork and the mountings are evenly loaded.
Checking exhaust system for leaks
Chapter
.
Specified torques:
Chapter
“
Assembly overview – SCR catalytic converters (vehicles compliant with EU 6 standard)
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