Wacker Neuson WM 90

WM 90 Repair Clearance Data and Limits Table
wc_tx000391gb.fm 93
Clearance between piston and cylinder at skirt
0.010–0.049
(0.0004–0.0019)
0.25
(0.010)
Piston ring end gap
Top ring
0.15–0.35
(0.006–0.014
1.5
(0.0591)
2nd ring
0.35–0.55
(0.014–0.022
1.5
(0.0591)
Oil ring
0.05–0.25
(0.002–0.010
1.5
(0.0591)
Cylinder
I
nner diameter Standard
STD
51.000–51.019
(2.008–2.009)
To be rebored
when the differ-
ence between
max. and min.
diameter
reaches 0.1
(0.004).
First reboring
51.250–51.269
(2.0177–2.0185)
Same as above
Second
reboring
51.500–51.519
(2.0276–2.0283)
Same as above
Roundness after reboring
Less than 0.01
(0.0004)
Cylindricity after reboring
Less than 0.01
(0.0004)
Item Standard
mm (in.)
Limit
mm (in.)
wc_gr001929
wc_gr001930
wc_gr001924