Volkswagen Golf / Golf GTI / Jetta. Manual — part 23

13-42

9 - Piston

pin

If

difficult
to
remove,
heat
piston
to 60

C

Remove

and
install
with drift
VW
222a

Piston and connecting rod, disassembling and assembling

13-43

Special tools and equipment

Test sequence

Fig. 1

Checking piston ring gap

Feeler gauge

- Push ring squarely from above down

to approx. 15 mm from bottom end of
cylinder. To do this use a piston
without rings.

Piston ring

Gap

New

Wear

limit

Compression
ring

mm 0.20...0.40 1.0

Tapered-
stepped ring

mm 0.20...0.40 1.0

Oil scraper
ring

mm 0.25...0.50 1.0

Piston and connecting rod, disassembling and assembling

13-44

Special tools and equipment

Test sequence

Fig. 2

Checking ring to groove
clearance

Feeler gauge

- Clean ring groove before checking.

Piston ring

Ring to groove

clearance

New

Wear

limit

Compression
ring

mm 0.04...0.08 0.15

Tapered-
stepped ring

mm 0.02...0.06 0.15

Oil scraper
ring

mm 0.03...0.06 0.15

Piston and connecting rod, disassembling and assembling

13-45

Special tools and equipment

Test sequence

Fig. 3

Checking piston

External micrometer 75...100 mm

- Take measurement approx. 6 mm

from lower edge of piston skirt
and offset 90 to piston axis.

Deviation from nominal

dimension: max. 0.04 mm

Piston and connecting rod, disassembling and assembling