SEAT Workshop Service and Repair Manuals

Servicing valve gear

Cylinder heads which have cracks between the valve seats or between valve seat inserts and the spark plug thread can be used further without reducing service life, provided the cracks do not exceed a maximum of 0.5 mm in width, or when no more than the first turns of the spark plug thread are cracked.

1 -

Camshaft

q	Checking axial clearance → Fig.

q	Markings and timing → Fig.

q	Removing and installing → Chapter

q	Oil contact surface

2 -	6 Nm + 1/4 turn (90 °) further

q

Renew

q	Observe assembly instructions and sequences when loosening and tightening → Chapter

3 -	Cylinder head cover

q	Remove remnants of old sealant

q	Coat with -D 154 103- before fitting

q	Removing and installing → Chapter

4 -

Oil seal

q	Lightly oil sealing lip of oil seal

q	Renewing → Chapter

5 -	Roller rocker finger

q	Check bearing for ease of movement

q	Oil contact surface

q	Use securing clip to clip onto support element when installing

6 -	Retaining clip

7 -	Support element

q	Do not interchange

q	With hydraulic valve clearance compensation

q	Check camshaft axial clearance before installing → Fig.

q	Oil contact surface

8 -

20 Nm

9 -	Lifting eye

10 -	Cylinder head

q	Reworking valve seats → Chapter

q	Reworking sealing surface → Fig.

11 -

Valves

q	Do not rework only grinding-in is permitted

q	Valve dimensions → Fig.

12 -	Valve guide

q	Checking → Chapter

q	Renewing → Chapter

13 -	Service part - valve guide

q	With collar

14 -	Valve stem seal

q	Renewing → Chapter

15 -	Valve spring

q	Removing and installing: Cylinder head removed: with -T20034/1- Cylinder head installed: → Chapter, Renewing valve stem seals

16 -	Upper valve spring plate

17 -

Cotters

Reworking cylinder head sealing surface, cylinder block side Cylinder head reworking dimension: a = At least 135.6 mm

Checking camshaft axial clearance Special tools and workshop equipment required t  Universal dial gauge holder -T20020- t  Dial gauge Check with support elements and cylinder head cover removed. –  Load camshaft by pressing down with thumb on camshaft centre bearing and check axial clearance by moving camshaft back and forth. Wear limit: max. 0.15 mm

Camshaft identification, valve timing

Marking between number 1 cylinder inlet and exhaust cam tabs

“030 BP” “CH PS5”

Valve timing at 1 mm valve lift

Engine code	ALD, ANV, AUC	AKK, ANW, AUD
Inlet valve opens ATDC	9.9 °	15.0 °
Inlet valve closes ABDC	28.9 °	22.4 °
Exhaust valve opens BBDC	30.1 °	16.7 °
Exhaust valve closes BTDC	11.1 °	9.3 °

Valve dimensions   Note! Valves must not be reworked. Only lapping-in is permitted. Engine codes ALD, ANV, AUC

Dimension		Inlet valve	Exhaust valve
Ø a	mm	31.0	26.0
Ø b	mm	5.98	5.96
c	mm	99.9	99.9
α	∠°	45	45

Engine codes AKK, ANW, AUD

Dimension		Inlet valve	Exhaust valve
Ø a	mm	34.0	28.0
Ø b	mm	5.973	5.953
c	mm	99.2	99.2
α	∠°	45	45