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❑ To measure radial clearance, tighten to 40 Nm but not further.
8 - Cylinder block
❑ Checking cylinder bores
⇒ page 58
.
❑ Removing and installing crankshaft
⇒ page 49
.
❑ Piston and cylinder dimensions
⇒ page 61
.
9 - Piston pin
❑ If difficult to remove, heat piston to 60°C.
❑ Remove and install using drift - VW 222 A- .
4.2
Checking piston and cylinder
Checking piston ring gap
⇒ page 57
.
Checking ring-to-groove clearance
⇒ page 57
.
Checking piston
⇒ page 58
.
Checking cylinder bore
⇒ page 58
.
Installing piston
⇒ page 58
.
Piston and cylinder dimensions
⇒ page 61
4.2.1
Checking piston ring gap
Special tools and workshop equipment required
♦ Feeler gauge
Test sequence
– Push ring at right angles to cylinder wall from above down to
approx. 15 mm from bottom end of cylinder. Push in using a
piston without rings.
Piston ring
Ring gap
New
Wear limit
Rectangular-section 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
4.2.2
Checking ring-to-groove clearance
Special tools and workshop equipment required
♦ Feeler gauge
Clean annular groove before check.
Piston ring
Clearance
New
Wear limit
Rectangular-section ring
mm 0.04 … 0.09
0.15
Tapered stepped ring
mm 0.03 … 0.06
0.15
Oil scraper ring
mm 0.02 … 0.06
0.15
Touareg 2010 ➤ , Touareg 2015 ➤
6-cylinder direct-injection engine (3.6 l engine, 4V) - Edition 12.2019
4. Pistons and conrods
57
