SEAT Workshop Service and Repair Manuals

Servicing valve gear

Cylinder heads with cracks between the valve seats may be used without reducing engine life, provided the cracks are small and not more than 0.5 mm wide.

1 -	Bearing cap

q	Installation position → Fig.

q	Installation sequence → Chapter, removing and installing camshaft

2 -

20 Nm

3 -

Camshaft

q	Checking axial clearance → Fig.

q	Removing and installing → Chapter

q	Checking radial clearance with plastigage Wear limit: 0.11 mm

q	Run-out: max. 0.01 mm

q	Identification and valve timing → Fig.

4 -	Bucket tappet

q	Before installing check camshaft axial clearance → Fig.

q	Checking → Chapter

q	Use pliers -U-10014- to remove

q	Do not interchange

q	With hydraulic valve clearance compensation

q	Oil contact surface

q	Store with cam contact surface downwards on storage plate -U-10083-

5 -

Cotters

6 -	Upper valve spring plate

7 -	Valve spring

q	Store on storage plate -U-10083-

q	Remove and install with assembly tool -T20034- → Chapter, Renewing valve stem seals

8 -	Valve stem seal

q	Renewing → Chapter

9 -	Valve guide

q	Checking → Chapter

q	Renewing → Chapter

q	Service version with collar

10 -

Oil seal

q	Lightly oil sealing lip of oil seal

q	To remove and install, remove bearing cap

q	Removing, installing and tensioning toothed belt → Chapter

11 -	Cylinder head

q	See note → Chapter

q	Reworking valve seats → Chapter

12 -

Valves

q	Valve dimensions → Fig.

q	Store on storage plate -U-10083-

q	Do not rework only grinding-in is permitted

13 -	Lower sealing cone

Checking camshaft axial clearance Special tools and workshop equipment required t  Universal dial gauge bracket -T20020- t  Dial gauge Check with bucket tappets removed and with first and last bearing caps fitted. Wear limit: max. 0.15 mm

Fitting position of camshaft bearing caps Note offset. Before installing camshaft fit bearing caps and determine fitting position.

Valve dimensions   Note! Valves must not be reworked. Only lapping-in is permitted.

Dimension		Inlet valve	Exhaust valve
Ø a	mm	35.950	31.450
Ø b	mm	6.963	6.943
c	mm	96.550	96.350
α	∠°	45	45

Camshaft identification, valve timing Identification t  Cam base diameter: a = 38 mm Ø t  Identification by stamped numbers and letters between inlet and exhaust cams:

Cylinder	Identification
Cylinder 1 -arrow A-	W
Cylinder 2 -arrow B-	028 H

Valve timing at 1 mm valve lift

Valve	Valve timing
Inlet opens after TDC	11 °
Inlet closes after BDC	25 °
Exhaust opens before BDC	40 °
Exhaust closes before TDC	10 °