SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | 3 cylinder Diesel engine (1.2 litre engine, Common Rail) | Enginecrankshaft group, pistons | Pistons and conrods

Measuring piston projection at „TDC“

Check the tool and equipment equivalence table according to the applicability between Seat / VW / Audi / Skoda → Chapter

Note

t	Piston projection at „TDC“ must be measured when installing new pistons or a short engine.

t	If different values are measured for the protrusion of pistons then the largest measurement is used.

t	Install the appropriate cylinder head gasket depending upon piston projection, according to following table:

Special tools and workshop equipment required

t	Measuring bridge -VW 382/7- of the measuring tool -VW 382-, see equivalent → Anchor

t	Measuring plate -VW 385/17- of the universal measuring tool -VW 385-, see equivalent → Anchor

t	Gauge -VAS 6079-, see equivalent → Anchor

Operation process

–	Secure dial gauge -VAS 6079- with measuring bridge -VW 382/7- and measuring plate -VW 385/17- to cylinder block as shown in the illustration.

–	Measure the protrusion on each piston at different positions and the positions marked with -arrows- (as viewed in the longitudinal direction of the engine: front and rear on the piston).

–	Install the appropriate cylinder head gasket depending upon piston projection, according to following table:

Piston projection above top surface of cylinder block mm	Identification (No. of holes)
0,91 … 1,00	1
1,01 … 1,10	2
1,11 … 1,20	3

Identification of cylinder head gasket

1 -	Part number

2 -

Holes

3 -

Disregard

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