Renewing seals on injectors N30/N33: VW 1.2 (CBZA, CBZB)
Step-by-step renewing seals on injectors N30/N33 for the VW 1.2 (CBZA/CBZB): factory workshop text. What to remove, in what order, and what to check after.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
📐 50 workshop diagrams for CBZA
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
Renewing seals on injectors
N30
/
N33
Special tools and workshop equipment required
Tool set for FSI engines
T10133C
Renewing Teflon seal
Remove intake manifold
Chapter
.
Remove
injector, cylinder 1
N30
to
injector, cylinder 4
N33
Chapter
.
Carefully clean
injector, cylinder 1
N30
to
injector, cylinder 4
N33
.
Carefully cut oil seal open with a knife
arrow
as shown.
Note
Avoid contact between knife blade and valve body under all circumstances.
Set of seals
Electronic Parts Catalogue
Remove old seal and clean seal groove in area of seal
arrow
.
Remove any deposits (coking) with a brass wire brush.
Put new seal
1
on
assembly cone
T10133/5
.
Using
assembly sleeve
T10133/6
(knurling points to seal
1
), gently slide seal onto
assembly cone
T10133/5
as far as possible.
Turn
assembly sleeve
T10133/6
around.
Note
The knurling no longer faces towards the seal.
Push oil seal
1
onto end of
assembly cone
T10133/5
.
Place
assembly cone
T10133/5
with seal from before onto
injector, cylinder 1
N30
to
injector, cylinder 4
N33
.
Using the
assembly cone
T10133/6
, push the seal further onto
injector, cylinder 1
N30
to
injector, cylinder 4
N33
.
The seal is not yet seated in its groove.
Remove
assembly sleeve
T10133/6
and
assembly cone
T10133/5
.
Push seal into annular groove by hand.
Fit
spacer sleeve
T10133/11
onto valve body.
Push
calibration sleeve
T10133/7
over seal as far as stop onto
spacer sleeve
T10133/11
.
Pull the
calibration sleeve
T10133/7
off.
Push
calibration sleeve
T10133/8
over seal as far as stop onto
spacer sleeve
T10133/11
.
Pull the
calibration sleeve
T10133/8
off.
Now the Teflon seal has correct installation dimensions.
Renewing support washer
Remove O-ring
3
.
Cut open the support washer
2
with small oblique cutting pliers and remove.
Pull
injector, cylinder 1
N30
to
injector, cylinder 4
N33
: Pull off the spring element
1
and push on the
securing plate
T10133/12
auf.
Slide support washer
1
into first groove
arrow
on injector using
calibration sleeve
T10133/17
(knurled side faces towards injector).
Put new support washer
1
onto
assembly cone
T10133/13
and push the latter onto injector as shown.
Turn
calibration sleeve
T10133/17
around.
Note
Knurled side is now no longer pointing towards injector.
Push
calibration sleeve
T10133/17
1
in
direction of arrow
as far as it will go until it touches the
securing plate
T10133/12
.
Pull
calibration sleeve
T10133/17
off again.
The support washer now has correct installation dimensions.
Fit a new spring element
1
for the
securing plate
T10133/12
.
Fit new O-ring
3
before the support washer
2
.
Note
The Teflon seal
arrow
must not be oiled to install injector.
Install
injector, cylinder 1
N30
to
injector, cylinder 4
N33
Chapter
.
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
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The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.