SEAT Workshop Service and Repair Manuals

Assembly diagram

1 -	Bearing cap

q	Installation position → Fig.

q	Fitting order → Chapter, Camshaft: removing and fitting

q	Apply a small amount of -AMV 174 004 01- sealant to the contact surface of the bearing cap 1

2 -

20 Nm

3 -

Camshaft

q	Axial play: checking → Fig.

q	Removing and fitting → Chapter

q	Radial play using Plastigage: verification

Wear limit: 0.1 mm

Eccentricity: máx. 0.01 mm

q	Distribution timing identification → Fig.

4 -

Pin

q	Ensure tight fit

5 -

80 Nm

q	Use tool -T20018A- to loosen and tighten

6 -

Cover

q	Replacement

7 -	Hydraulic cam follower

q	Do not interchange

q	With hydraulic valve clearance compensation

q	Checking → Chapter

q	Place with contact surface downwards

q	Before fitting, check the axial play of the camshaft → Fig.

q	Oil sliding surface

8 -	Valve cotters

9 -	Upper valve spring plate

10 -	Valve spring

q	Removing and fitting:

Cylinder head removed: using the -T20034/1- tool

Checking: → Chapter, valve stem seals: replacement

11 -	Valve stem seal

q	Replace → Chapter

12 -	Lower valve spring plate

13 -	Valve guide

q	Checking → Chapter

q	Replace → Chapter

q	Valve guide for repairs, with collar

14 -	Cylinder head

q	Replacement cylinder heads with camshaft half bearings → Fig.

q	Valve seating: reworking → Chapter

q	Sealing surface: reworking → Fig.

q	See note → Item

15 -

Oil seal

q	Replace → Chapter

16 -	Reworking dimensions

q	Minimum height: a = 132.6 mm

17 -

Valves

q	Do not rework, only grinding is permitted

q	Valve dimensions → Fig.

Sealing surface of the cylinder head: reworking Cylinder head reworking dimension: a = at least 132.6 mm   Note When the sealing surface is reworked, the valves must be lowered by the same amount (rework the valve seat inserts), if not the pistons will collide with the valves. Ensure that the minimum acceptable dimension is not passed → Chapter.

Axial play of the camshaft: verification Special tools and workshop equipment required t  Bracket -T20020- t  Dial gauge Carry out the measurement with the hydraulic pushers removed and with the first and last bearing caps in place.    Wear limit: max. 0.15 mm

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

Dim.	Valv. inlet	Valv. exhaust
Ø a mm	38.0	33.0
Ø b mm	7.97	7.95
c mm	91.90 - 0.90	91.20 - 0.40
α ∠°	45	45

Assembly position for the bearing caps of the camshaft Note the eccentricity. Before mounting the camshaft, fit the bearing caps and establish the assembly position.

Identification of the camshaft distribution timing Identification t  Basic diameter of the cams: a = Ø 34 mm.

Between inlet and exhaust cams, cylinder 1 -arrow I-	M
Between inlet and exhaust cams, cylinder 3 -arrow II-	026

Distribution time for 1 mm run of the valve
Inlet opens after TDC	4°
Inlet closes after BDC	26°
Exhaust opens before BDC	24°
Exhaust closes before BDC	2°

Replacement cylinder heads with camshaft half-bearings Replacement cylinders or replacement engines are usually delivered with half-bearings for the camshaft. A -  Cylinder head with camshaft of normal dimensions: a = Ø 26.0 mm. B -  Cylinder head with camshaft of reduced dimensions: a = Ø 25.75 mm with a yellow point on the manufacturers symbol.   Note The camshaft of reduced dimensions is not delivered as a spare part. For repairs, fit and mount the camshaft of normal dimensions with the corresponding half-bearings.