Generac Power Systems 53187 - Manual (Page 80)

PART 2
ENGINE MECHANICAL
i
SECTION 2.5
ENGINE REASSEMBLY
Section 2.5
ENGINE REASSEMBLY
General
This section provides instructions for the reassem ­
bly of the engine. Be sure to w ash all parts prior to
reassem bly. In addition, be sure to coat all sliding and
rotating surfaces w ith fresh, clean, new engine oil. Such
surfaces as cylinder bores, pistons, bearings, bearing
surfaces, etc., should be liberally coated w ith oil. Use
new gaskets, seals and o-rings. Alw ays tighten bolts to
the recom m ended tightness. Never overtighten any
fasteners that thread into alum inum .
Relief Valve
See Figure 16 on Page 2.3-4. Install a new o-ring
onto the relief valve assem bly. Install the relief valve
and tighten to the recom m ended torque.
RELIEF VALVE TORQUE
43-61 Ft-Lbs. m-kg)'
Crankshaft and Bearing Holder
1. Instali bearing holder onto crankshaft and into bush­
ing at front of cylinder block.
2. Align bolt holes at low er part of cylinder block w ith
threaded holes on bearing holder, install and tighten
bolts. Use tw o hex head bolts at flyw heel side.
BEARING HOLDER TORQUE
18-22 Ft.-Lbs. (2.S-3.0 m-kg)
3. Measure the crankshaft end play, in the direction of
the crankshaft.
Figure 2. Cheeking Crankshaft End Play
CRANKSHAFT END PLAY
Standard = 0.0020-0.0118 inch (0.05-0.30mm)
Allowable Limit = 0.020 Inch (O.Smm)
4. Install oil seal at flyw heel end of crankshaft (Figure
3).
5. Install flyw heel cover. Spread liquid packing over the
M10 screw hole of the cylinder block flyw heel cover
face (Rgure 4), then fit the flyw heel over it.
FLYWHEEL TIGHTENING TORQUE
—34-40Tt:-Lb8. (4.T-S.S m-kgj—
6. Install the flyvyheel. Pay close attention to location of
the alignm ent pin. Retain flyw heel w ith bolts and lock
ring. See Figure 5.
FLYWHEEL TIGHTENING TORQUE
43-Si Ft.-Lbs. (6-y m-ltg)
PAGE 2.5-1