SEAT Workshop Service and Repair Manuals

Servicing valve gear

Cylinder heads that have cracks between the valve seats can still be used without loss in their useful life, so long as the cracks are no wider than a maximum of 0.5 mm.

1 -	Bearing cap

q	Installation position → Fig.

q	Installation sequence → Chapter

2 -

20 Nm

3 -

Camshaft

q	Checking axial clearancen → 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	Do not interchange

q	With hydraulic valve clearance compensation

q	Checking → Chapter

q	Store with cam contact surface down-wards

q	Before installing check camshaft axial clearance → Fig.

q	Oil contact surface

5 -

Cotters

6 -	Upper valve spring plate

7 -	Valve spring

q	Removing and installing:

Cylinder head removed: with -T20034/1-

installed: → 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	To remove and install, remove bearing cap

q	Removing and installing toothed belt → Chapter

11 -	Cylinder head

q	See note → Chapter

q	Reworking valve seats → Chapter

12 -	Reworking valve seats

q	Valve dimensions → Fig.

Checking camshaft axial clearance Special tools and workshop equipment required t  Universal dial gauge bracket -T20020- t  Dial gauge Take measurement with the tappets removed and with the first and last caps installed. 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. (Engine codes AGP, AQM)

Dimension		Dimension	Exhaust valve
Ø a	mm	35.95	31.45
Ø b	mm	6.963	6.943
c	mm	96.55	96.35
α	∠°	45	45

(Engine codes AGR, ALH, ASV)

Dimension		Inlet valve	Exhaust valve
Ø a	mm	35.95	31.45
Ø b	mm	6.963	6.943
c	mm	96.85	96.85
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:

Engine codes	AGP, AQM	AGR, ALH, ASV
Cylinder 1--arrow A-	38E	038K
Cylinder 2 -arrow B-	DE	DE

Valve timing at 1 mm valve lift

Engine codes	AGP, AQM	AGR, ALH, ASV
Inlet opens after TDC	11°	16°
Inlet closes after BDC	25°	25°
Exhaust opens before BDC	40°	28°
Exhaust closes before TDC	10°	19°