Maintenance
0330−1/A1
Winterthur Gas & Diesel Ltd.
19/ 25
Piston and Piston Rings
Group
Key No.
Description Measured
Direction
Nominal
Dimension
(mm)
(usual, new)
Maximum Clearance,
Dimension
(mm)
(because of worn
components)
3406 Piston Head
1 Head (tapered part) outer ∅
495
0
− 0.2
2 Head outer ∅
497.7
0
− 0.2
3403
3425
Piston ring grooves
3 Height of the top groove vertical
17
+ 0.38
+ 0.33
4 Height of the two lower grooves vertical
15
+ 0.33
+ 0.28
5 Groove depth radial 17.50
3425 Piston rings
3 Top ring height vertical
17
0
− 0.03
4 Lower ring height vertical
15
0
− 0.03
Point A Point B
6 Top ring clearance vertical 0.33−0.41 0.60 0.75
7 Ring clearance vertical 0.28−0.36 0.58 0.75
8 Ring width radial
18.0 ± 0.25
8a Ring width radial
16.5 ± 0.25
3403 Piston skirt
9 Skirt outer ∅
499.4
− 0
− 0.2
min. 497.7
3403 Piston rod
10 Rod outer ∅
200
− 0.050
− 0.096
min. 199.30
Removed piston rings can be installed again if they are in their minimum ring width
until the next overhaul (for more data about the piston rings refer to 3425−1).
2016
Clearance Table
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