Volkswagen Golf / Golf GTI / Golf Variant. Service manual - part 661

Tightening Specifications
♦ Refer to

⇒ “5.1 Overview - Piston and Connecting Rod”, page 77

 .

5.3

Pistons and Cylinder Bore, Checking

⇒ “5.3.1 Pistons and Cylinder Bore, Checking, Engine Codes

CXBA, CXBB, CNSA and CNSB”, page 80
⇒ “5.3.2 Piston and Cylinder Bore, Checking, Engine Codes

CNTA, CXCA, CXCB”, page 82

5.3.1

Pistons and Cylinder Bore, Checking,

Engine Codes CXBA, CXBB, CNSA and

CNSB

Pistons, Checking

Special tools and workshop equipment required
♦ Outside Micrometer - 75-100mm - VAS6071-
– Measure approximately 15 mm in from the lower edge at a 90°

angle to the piston pin axis using a micrometer.

♦ Deviation from specified size: maximum 0.04 mm

Basic Dimension

Piston Diameter

in mm

82.465 

1)

•

1)

 Measurements without graphite coating (thickness = 0.02

mm). The graphite coating wears off.

Checking Piston Ring Gap

Special tools and workshop equipment required
♦ Feeler Gauge
– Push piston ring squarely from above down to approximately

15 mm from bottom end of cylinder. To do this use a piston

without rings.

Piston Ring

Dimensions in mm

New

Wear Limit

Compression ring

0.20 to 0.40

0.80

Oil scraping ring

0.25 to 0.50

0.80

Piston Ring Groove Clearance, Checking

Special tools and workshop equipment required
♦ Feeler Gauge
– Clean the piston ring groove before checking.

Piston Ring

Dimensions in mm

New

Wear Limit

1st Compression ring

0.06 to 0.09

0.20

2nd Compression ring

0.03 to 0.06

0.15

Oil scraping rings

Cannot be measured

Check Cylinder Bore

Special tools and workshop equipment required
♦ Cylinder Dial Bore Gauge - VAS6078-

NOTICE

Risk of damaging the cylinder bore surface through incorrect

handling.
– Never handle the cylinder bore with service equipment (drill‐

ing, honing, grinding).

– Using a Cylinder Dial Bore Gauge - VAS6078- measure in a

diagonal sequence at three positions transversely -A- and lon‐

gitudinally -B-.

♦ Deviation from specified size: maximum 0.08 mm

Basic Dimension

Cylinder Bore Diame‐

ter

in mm

82.51

Note

The cylinder bore must not be measured when the cylinder block

is mounted on the Engine and Transmission Holder - VAS6095-

because the measurements may be incorrect.

5.3.2

Piston and Cylinder Bore, Checking, En‐

gine Codes CNTA, CXCA, CXCB

Pistons, Checking

Special tools and workshop equipment required
♦ Outside Micrometer - 75-100mm - VAS6071-
– Measure approximately 15 mm in from the lower edge at a 90°

angle to the piston pin axis using a micrometer.

♦ Deviation from specified size: maximum 0.04 mm

Basic Dimension

 

Piston Diameter

in mm

82.42 

1)

•

1)

 Measurements without graphite coating (thickness = 0.02

mm). The graphite coating wears off.

Checking Piston Ring Gap

Special tools and workshop equipment required
♦ Feeler Gauge
– Push piston ring squarely from above down to approximately

15 mm from bottom end of cylinder. To do this use a piston

without rings.

Piston Ring

Dimensions in mm

New

Wear Limit

1st Compression ring

0.30 to 0.40

0.80

Piston Ring

Dimensions in mm

New

Wear Limit

2nd Compression ring

0.40 to 0.50

0.80

Oil scraping ring

0.20 to 0.40

0.80

Piston Ring Groove Clearance, Checking

Special tools and workshop equipment required
♦ Feeler Gauge
– Clean the piston ring groove before checking.

Piston Ring

Dimensions in mm

New

Wear Limit

1st Compression ring

0.06 to 0.09

0.20

2nd Compression ring

0.03 to 0.06

0.15

Oil scraping rings

Cannot be measured

Check Cylinder Bore

Note

The cylinder bore must not be measured when the cylinder block

is mounted on the Engine and Transmission Holder - VAS6095-

because the measurements may be incorrect.

Special tools and workshop equipment required
♦ Cylinder Dial Bore Gauge - VAS6078-

NOTICE

Risk of damaging the cylinder bore surface through incorrect

handling.
– Never handle the cylinder bore with service equipment (drill‐

ing, honing, grinding).