SEAT Workshop Service and Repair Manuals

Assembly diagram

1 -	Piston ring

q	Offset gaps by 120°

q	Remove and install with piston ring pliers

q	“TOP” faces towards piston crown

q	Checking ring gap → Fig.

q	Checking ring to groove clearance → Fig.

q	2 or 3 part oil scraper ring, mixed installations permissible

2 -

Piston

q	Checking → Fig.

q	Mark installation position and cylinder number

q	Arrow on piston crown points to pulley end

q	Install using piston ring clamp

3 -

Conrod

q	Only renew as a set

q	Mark cylinder number -B-

q	Installation position: Marking -A- faces towards pulley end

4 -	Conrod bearing cap

q	Note installation position

5 -	30 Nm + 1/4 turn (90°) further

q	Oil threads and contact surface

q	To measure radial clearance tighten to 30 Nm but not further

6 -	Pressure relief valve, 27 Nm

q	Opening pressure: 2,5 … 3,2 bar

7 -	Oil spray jet

q	For piston cooling

8 -	Bearing shell

q	Note installation position

q	Do not interchange used bearing shells

q	Ensure retaining lugs fit tightly in recesses

q	Axial clearance

New: 0,05 … 0,31 mm

Wear limit: 0,37 mm

q	Check radial clearance with Plastigage:

New: 0,01 … 0,06 mm

Wear limit: 0,12 mm

Do not rotate crankshaft when checking radial clearance

9 -	Cylinder block

q	Checking cylinder bores → Fig.

q	Piston and cylinder dimensions → Chapter

10 -	Conrod bolt

11 -

Circlip

12 -	Piston pin

q	If difficult to remove, heat piston to 60 °C

q	Remove and install with -T20019-

Checking piston ring gap Special tools and workshop equipment required t  Feeler gauges –  Push ring squarely from above down to approx. 15 mm from bottom end of cylinder.

Piston ring		Gap
		New	Wear limit
Compression rings	mm	0,20…0,40	0,8
Oil scraper ring	mm	0,25…0,50	0,8

Checking ring to groove clearance Special tools and workshop equipment required t  Gauge Clean groove before check.

Piston ring		Gap
		New	Wear limit
Compression rings	mm	0,06…0,09	0,20
Oil scraper ring	mm	0,03…0,06	0,15

Checking piston Special tools and workshop equipment required t  Exterior micrometer 75 … 100 mm Measure pistons approx. 10 mm from the lower edge of skirt, at 90° to the piston pin axis. Deviation from nominal dimension max. 0.04 mm

Checking cylinder bores Special tools and workshop equipment required t  Interior gauge 50 … 100 mm –  Measure bores at 3 locations in both directions -A- across the engine and -B- in line with crankshaft. Deviation from nominal dimension max. 0.08 mm   Note! Measuring the cylinder bores must not be done when the cylinder block is mounted on a repair stand with adapter bracket -Ar-2204 A-, as incorrect measurements would then be possible.