SEAT Workshop Service and Repair Manuals > Leon Mk1 > Power unit | 4 cylinder TDI Engine, 2.0 l, 4 V with injector pump, mechanics | Enginecrankshaft group, pistons | Piston and conrod: Dismantling and assembling

Checking piston position at TDC: check

t	Test sequence → Anchor

t	Cylinder head identification → Anchor

Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter.

Special tools and workshop equipment required

t	Socket -T20026-, see equivalent → Anchor

t	Dial gauge

Test sequence

When fitting new pistons or engine from the spare parts catalogue, the projection measurement of the piston at TDC must be measured.

Depending on the protrusion measure of the pistons, fit a corresponding cylinder head gasket, according to the following table:

Piston projection on the upper edge of the engine block	Identification (No. of holes)
0.91 ... 1.00 mm	1
1.01 ... 1.10 mm	2
1.11 ... 1.20 mm	3

Cylinder head identification

t	Part No. = -Arrow 1-

t	Production code = -Arrow 2- (can be disregarded)

t	Holes = -Arrow 3-

Note

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

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