WinGD X92 - Page 55

Maintenance
0330−1/A1
Winterthur Gas & Diesel Ltd.
19/ 25
Piston and Piston Rings
Group
Key No.
Description Measuring
Direction
(method of
measuring)
Nominal
Dimension
(usual, new)
[mm]
Maximum Clearance,
Dimension
(because of wear)
[mm]
3406 Piston head
2 Head outer ∅
916.1
− 0
− 0.2
3406 Piston ring grooves
3 Height of the uppermost groove vertical
26
+ 0.55
+ 0.50
4 Height of the middle groove vertical
17
+ 0.50
+ 0.45
4a Height of the lowest groove vertical
19
+ 0.50
+ 0.45
5a Groove depth, uppermost radial
32
+ 0.2
+0
5b Groove depth, middle radial
23
+ 0.2
+0
5c Groove depth, lowest radial
29
+ 0.2
+0
3425 Piston rings
3 Ring height, uppermost vertical
26
0
− 0.03
4 Ring height, middle vertical
17
0
− 0.03
4a Ring height, lowest vertical
19
0
− 0.03
Point A Point B
6 Ring clearance vertical 0.50−0.58 0.80 1.00
7 Ring clearance vertical 0.45−0.53 0.75 0.95
7a Ring clearance vertical 0.45−0.53 0.75 0.95
8a Ring width, uppermost radial
30 ± 0.25
8b Ring width, middle radial
20 ± 0.25
8c Ring width, lowest radial
26 ± 0.25
3403 Piston skirt
9 Skirt outer ∅
919.3
− 0
− 0.1
min. 918.0
3403 Piston rod
10 Rod outer ∅
360
− 0.062
− 0.119
min. 358.9
Used 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 see also 3425−1).
Clearance Table
2015