Wacker Neuson WM 90 User Manual

WM 90 Repair Reassembly Procedures
wc_tx000389gb.fm 57
8.5 Installing Piston
See Graphic: wc_001902, wc_gr001903, and wc_gr001904
8.5.1 Position the piston rings so that the gaps in the rings are at 90°
intervals from each other (a = top ring, b = second ring, c = oil ring).
8.5.2 Apply oil to the piston rings, the cylinder bore, and the large end of the
connecting rod.
8.5.3 Position the “MA” mark on the crankshaft so that it faces the flywheel
side of the engine when assembled. Then, using a ring guide (d), hold
the piston rings in and lower the piston into the cylinder.
Note: If you do not have a ring guide, hold the piston rings in with your
fingers while tapping lightly on the piston head with a block of wood or
rubber mallet.
8.5.4 Rotate the crankshaft down to the bottom dead center and lightly tap
the piston head until the large end of the connecting rod touches the
crank pin.
8.5.5 To mount the connecting rod, line up the matching marks (e) and fit the
connecting rod cap to the connecting rod. Secure the two halves
together using two M5 bolts. Torque bolts to: 5.9–7.8 Nm (4.3–5.7
ft.lbs).
8.5.6 Check for free movement of the connecting rod by turning the
crankshaft slowly.
"MA"
d
wc_gr001902
wc_gr001904
e

Wacker Neuson WM 90 Specifications

General

Brand	Wacker Neuson
Model	WM 90
Category	Engine
Language	English