WinGD X72 - Page 45

Maintenance
0330−1/A1
Winterthur Gas & Diesel Ltd.
19/ 27
Piston and Piston Rings
Group
Key No.
Description Measuring
direction
(method of
measuring)
Nominal
dimension
(normal, new)
[mm]
Maximum clearance,
dimension
(due to wear)
[mm]
3406 Piston head
1 Head (tapered part) outer ∅
714.6
− 0
− 0.2
2 Head outer ∅
716.5
− 0
− 0.2
3406 Piston ring grooves
3 Height of the uppermost groove vertical
22
+ 0.55
+ 0.50
4 Height of the middle groove vertical
13
+ 0.50
+ 0.45
4a Height of the lowest groove vertical
13
+ 0.50
+ 0.45
5 Groove depth radial
24
+ 0.2
+0
3425 Piston rings
3 Ring height vertical
22
0
− 0.03
4 Ring height vertical
13
0
− 0.03
4a Ring height vertical
13
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
8 Ring width radial
23 ± 0.25
3403 Piston skirt
9 Skirt outer ∅
719
− 0
− 0.1
min. 717.9
10 Rubbing ring outer ∅
719.3
− 0
− 0.1
3403 Piston rod
11 Rod outer ∅
278
− 0.056
− 0.108
min. 277.05
Used piston rings may be refitted if they will keep within their min. ring width until the next
overhaul (for judging and reusing piston rings see also 3425−1).
For evaluating and reusing piston heads see 3425−1).
Clearance Table
2015