– Install piston with commercially available piston ring tension‐
ing strap, check installation position ⇒ page 71 .
– Install conrod bearing cap, check installation position Pos.
-2- ⇒ page 69 .
– Install cylinder head ⇒ page 80 .
– Install sump top part ⇒ page 132
Tightening torques
♦ Conrod with conrod bearing cap
⇒ “4.1 Piston and conrod - Summary of components”,
page 69
4.3 Checking piston and cylinder bore
Inspecting pistons
– Using an external micrometer, measure pistons approx.
10 mm from the lower edge of skirt, at 90° to the piston pin
axis.
• Maximum deviation from nominal dimension: 0.04 mm.
Piston ∅ mm
Nominal dimension without lu‐
bricating coating
76.455 + 0.009
– 0.009
Nominal dimension with lubri‐
cating coating
76.485 + 0.017
– 0.017
Measure piston ring end gap
– Insert ring at right angles from above down into lower cylinder
opening, about 15 mm away from edge of cylinder.
– Push a commercially available feeler gauge into the piston ring
opening to check the end gap.
Piston ring new
mm
Wear limit
mm
1. Compression ring
0.20
+ 0.15
1.0
2. Compression ring
0.40
+ 0.20
1.0
Oil scraper rings 3 part
0.20
+ 0.50
no wear indica‐
tion possible
Measure piston ring vertical gap
– Clean before inspecting the annular groove of the piston.
Piston ring new
mm
Wear limit
mm
1. Compression ring 0.04 … 0.08 0.15
2. Compression ring 0.03 … 0.07 0.15
Oil scraper rings (3 part) cannot be measured
Octavia III 2013 ➤ , Octavia III 2014 ➤ , Yeti 2010 ➤ , Yeti 2011 ➤
1.6/81 kW MPI engine - Edition 06.2014
4. Pistons and conrods 73
ProCarManuals.com
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