SEAT Workshop Service and Repair Manuals

Cylinder head, camshaft - Component overview t  Camshaft axial clearance: checking → Fig. t  Seal contact surfaces of bearing caps 1 and 5 → Parts Catalogue → Fig. t  Valve dimensions → Fig. t  Identification of the camshaft distribution timing → Fig. t  Distribution time for 1 mm run of the valve → Anchor

1 -	20 Nm + 90° (1/4 turn)

q

Renew

q	Observe sequence when loosening and tightening → Chapter.

2 -	Rocker axle

3 -	Cylinder head bolt

q

Renew

q	Observe sequence when loosening and tightening → Chapter.

q	Prior to installation, insert washers → Item in cylinder head

4 -

Washer

q	For cylinder head bolts

5 -	Hydraulic followers:

q	Do not interchange

q	With hydraulic valve play compensation

q	Set down with cam bearing surface facing downwards.

q	Checking axial clearance of camshaft before fitting → Fig.

q	Oil contact surface.

q	Before separation, extract the half bearings from the camshaft

6 -	Valve half-cones

7 -	Valve plate spring

8 -	Exterior valve spring

q	Removing and fitting with the cylinder head removed using the valve installation tool -T20034/1-. Cylinder head fitted → Chapter

9 -	Interior valve spring

q	Removing and installing: cylinder head removed with the gasket tool -T20034/1-, cylinder head fitted → Chapter

10 -	Valve stem seal

q	Replace → Chapter

11 -	Valve guide

q	Checking → Chapter

q	If the wear limit is still exceeded, replace the cylinder head

12 -	Injector pump

q	Removing and installing → Chapter

13 -	Cylinder head

q	See note → Chapter

q	Valve seats: reworking → Chapter

14 -

Seal

q	Do not grease or oil the seal lip of the seal.

q	Before fitting, clean the remains of oil on the crankshaft journal using a clean cloth.

q	For fitting, cover the camshaft cone groove (for ex. With cellophane)

q	Removing and installing → Chapter

15 -

Valves:

q	Valve dimensions → Fig.

16 -	Bearing cap

q	Do not interchange used bearing shells (mark)

q	Ensure the correct seating in the allotment

17 -

Camshaft:

q	check the axial play → Fig.

q	Removing and installing → Chapter

q	Check the radial play using a Plastigage: Wear limit: 0.11 mm

q	Radial clearance: Max. 0.01 mm

q	Identification and distribution time → Fig.

18 -	Bearing cap

q	Fitting order → Chapter

q	The bearing cap 4 is identified as bearing cap 5.

q	Seal contact surfaces of bearing caps 1 and 4 for installation → Spare parts catalogue → Fig.

19 -	8 Nm + 90° (1/4 turn)

q

Renew

Camshaft axial clearance: –  Carry out the measurement support -T20020- and the gauge, with the hydraulic followers removed and the bearing caps in place. l  Axial play, wear limit: 0.15 mm

Seal contact surfaces of bearing caps -1- and -4- –  Apply a fine, even layer of sealant to the surfaces -1- → Parts Catalogue .   Note t  Ensure that the sealant does not enter in the grooves -arrows-. t  The bearing cap 4 is identified as bearing cap 5.

Valve dimensions   Note The intake and exhaust valves should not be refaced or reworked. They may only be grinded.

Dim.		Inlet valve	Outlet 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 diameter of the cams: -a- = Ø 52.8 mm t  Identification using numbers and letters stamped on the frontal surface of the cam for the exhaust valve on the cylinder 3. t  Cylinder 3 -arrow-: 858 D Distribution time for 1 mm run of the valve

Inlet opens at TDC	15,8°
Inlet closed at BDC	25,3°
Exhaust opens before BDC	28,2°
Exhaust closes before TDC	18,7°