SEAT Workshop Service and Repair Manuals

Valve control: repairing

t	The cylinderheads with cracks between the valve seats can still be used without decrease in their useful life, so long as the cracks are no wider than 0.5 mm max.

t	Before installation work, oil the support and slide surfaces.

1 -	20 Nm + 1/4 turn (90°)

q

Replace

q	Follow the installation order when loosening and tightening → Fig., Camshaft: removing and installing

2 -	Rocker shaft

3 -	Cylinderhead bolt

q

Replace

q	Follow the installation order when loosening and tightening → Anchor, Cylinderhead: removing and installing

q	Before installation, fit the washers → Item in the cylinderhead

4 -

Washer

q	For the cylinderhead bolts

5 -	Hydraulic plunger

q	Before removing, remove the half-bearings of the camshaft

q	Do not swap them

q	With hydraulic compensation of valve play

q	Place with the slide surface down

q	Before installation test the axial play of the camshaft → Fig.

q	Lubricate the slide surface

6 -	Half-cones

7 -	Valve spring plate

8 -	Valve spring, exterior

q	Remove and install: Cylinderhead: removed: with -T20034/1- installed: → Item, replace the valve stem seals

9 -	Valve spring, interior

q	Remove and install: Cylinderhead: removed: with -T20034/1- installed: → Item, replace the valve stem seals

10 -	Valve stem seal

q	Replace → Item

11 -	Valve guide

q	Test → Item

q	Replace → Item

q	Repair guides, with collar

12 -	Pump injector

q	Remove and install → Chapter

13 -	Cylinderhead

q	Bear in mind the note → Anchor

q	Re-cut the valve seats → Chapter

14 -

Seal

q	Do not apply more oil or grease to the seal lip

q	Before installation, clean excess oil from the camshaft journal with a clean cloth

q	For installation, cover the slot in the camshaft cone (e.g. with tape)

q	Remove and install → Chapter

15 -

Valves

q	Valve dimensions → Fig.

16 -	Half-bearings

q	Do not swap the used half-bearings (mark them)

q	Check that the cylinderhead and the fixing flanges fit well in the caps

17 -

Camshaft

q	Test the axial play → Fig.

q	Remove and install → Fig.

q	Test the radial play with Plastigage Wear limit: 0.11 mm

q	Eccentricity: max. 0.01 mm

q	Identification and distribution timing → Fig.

18 -

Cap

q	Installation order → Fig., Camshaft: removing and installing

q	Cap 4 is marked as cap 5

q	For installation, seal the contact surfaces of caps 1 and 4 with -AMV 17400401- → Fig.

19 -	20 Nm + 1/4 turn (90°)

q

Replace

Measure the axial play of the camshaft Special tools and workshop equipment required t  Support universal for gauge -T20020- t  Gauge Measure with the cup plungers removed and the caps installed. Wear limit: max. 0.15 mm

Seal the contact surfaces of caps 1 and 4 with -AMV 17400401- Apply and thin, even coating of -sealant AMV 17400401- to the surfaces -1-.   Note! t  Make sure that no sealant gets into the slots -arrows-. t  The cap 4 is marked as cap 5.

Valve dimensions   Note! The valves can not be re-cut, only seated.

Dimension		Intake valve	Exhaust valve
Ø a	mm	35.95	31.45
Ø b	mm	6.980	6.956
c	mm	89.95	89.95
α	∠°	45	45

Identification of the camshaft, distribution timing Identification t  Basic cam diameter: a = Ø 52.8 mm t  Identification with numbers and letters stamped on the front of the exhaust valve cam in the cylinder 3.

Cylinder 3 -arrow-

045 C

Distribution timing for 1 mm of valve stroke

Intake opens after TDC			15.8°
Intake closes after BDC			25.3°
Exhaust opens before BDC			28.2°
Exhaust closes before TDC			18.7°