Checking Pistons And Cylinder Bores - Seat Ateca 2017 Workshop Manual

Ateca 2017 ➤ , León 2013 ➤ , León ST 2013 ➤
4 cyl. petrol engine (1.8 l and 2.0 l with direct injection, 4 V, exhaust gas turbocharger, timing chain,
EA 888 III. Gen) - Edition 10.2018
5.3

Checking pistons and cylinder bores

Checking piston
Special tools and workshop equipment required
♦ External micrometre 75 - 100 mm - VAS 6071-
– Using a micrometer, measure approx. 15 mm from the lower
edge, perpendicular to the piston pin axis.
♦ Difference between actual and nominal diameter max.
0.04 mm.
Basic dimension
• 1)
Dimensions without graphite coating (thickness 0.02
mm). The graphite coating is used up gradually.
Checking end clearance
– Push ring at right angles to cylinder wall from above down to
approx. 15 mm from bottom end of cylinder. Use a piston with‐
out rings to push ring into bore.
Piston ring gap in connection
with two-part oil scraper ring
1st compression ring
2nd compression ring
Oil scraper ring
Piston ring gap in connection
with three-part oil scraper ring
1st compression ring
2nd compression ring
Oil scraper ring
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permitted unless authorised by SEAT S.A. SEAT S.A does not guarantee or accept any liability with
respect to the correctness of information in this document. Copyright by SEAT S.A.
100
Rep. gr.13 - Crankshaft group
Piston ∅
mm 1)
82.42
New Wear limit
0.30 ... 0.40 0.80
0.40 ... 0.50 0.80
0.20 ... 0.40 0.80
New Wear limit
0.30 to 0.60 mm
0.40 mm
0.40 to 0.70 mm
0.50 mm
Cannot be Cannot be
measured measured