SEAT Workshop Service and Repair Manuals

Assembly overview - valve gear

1 -	20 Nm + 1/4 turn (90°) further

q

Renew.

q	Observe sequence when loosening and tightening → Chapter.

2 -	Rocker arm shaft

q	Do not interchange.

3 -	Cylinder head bolt

q	Observe sequence when loosening and tightening → Chapter.

q	Before installing, insert washers ( → Item) in cylinder head.

4 -

Washer

q	For cylinder head bolts.

q	Insert in cylinder head before installing bearing caps

5 -	Bucket tappet

q	Do not interchange.

q	With hydraulic valve clearance compensation.

q	Place down with contact surface facing downwards

q	Before installing, check camshaft axial clearance → Fig..

q	Oil contact surface.

q	Before removing, remove camshaft bearing caps.

6 -	Valve cotter

7 -	Valve spring plate

8 -	Outer valve spring

q	Removing and installing → Chapter.

q	With valve spring compressor -2037-, with cylinder head removed

9 -	Inner valve spring

q	Removing and installing → Chapter.

q	With valve spring compressor -2037-, with cylinder head removed

10 -	Valve stem seal

q	Renewing → Chapter.

11 -	Valve guide

q	Checking → Chapter.

12 -	Unit injector

q	Removing and installing → Chapter.

13 -	Cylinder head

q	See note → Chapter.

14 -

Seal

q	Do not additionally oil or grease the oil seal sealing lip.

q	Before installing, remove residual oil from camshaft journal using a clean cloth.

q	To install, mask off groove on camshaft taper (e.g. using Sellotape)

q	Removing and installing → Chapter.

15 -

Valves

q	Valve dimensions → Fig..

16 -	Bearing shell

q	Do not interchange used bearing shells (mark).

q	Ensure that retaining lugs are correctly seated in bearing caps and cylinder head

17 -

Camshaft

q	Checking axial clearance → Fig..

q	Removing and installing → Chapter.

q	Check radial clearance with Plastigage, wear limit: 0.11 mm.

q	Runout: max. 0.01 mm.

q	Identification → Fig..

18 -	Bearing cap

q	Installation sequence → Chapter

q	To install, seal parting surfaces of bearing caps 1 and 5 with sealant -AMV 174 004 01- → Fig.

19 -	8 Nm + 1/4 turn (90°) further

q

Renew.

Checking camshaft axial clearance Special tools and workshop equipment required t  Universal dial gauge bracket -VW 387- t  Dial gauge Check with bucket tappets removed and with first, third and last bearing caps fitted. Wear limit: max. 0.15 mm

Seal parting surfaces of bearing caps 1 and 5 with sealant -AMV 174 004 01- –  Apply sealant -AMV 174 004 01- thinly and evenly on the surfaces -1-.   Note t  Observe expiry date of sealing compound. t  Be careful that no sealant gets into grooves -arrows-. t  The bearing caps must be installed within 5 minutes after applying sealant.

Valve dimensions   Note Valves must not be reworked. Only grinding-in is permissible.

Dimension		Inlet 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

Camshaft identification t  Cam base diameter: a = 52.8 mm Ø t  Identification by stamped numbers and letters on front side of No. 4 cylinder exhaust cam -arrow-: 038 R or 858 R