Generac Power Systems 53187 - Manual (Page 76)

PART 2
ENGINE MECHANICAL
Connecting Rods (Continued)
Install the rings Into piston w ith scribed m arks at
end of rings facing upw ard.
CAUTION: The difference In weight between
cylinders of the assembled piston, piston pin,
connecting rod and rings should not exceed
0.35 ounce (10 grams).
Main Bearing Holders
Rem ove the bearing holder and inspect for peeling,
cracking, w ear, etc. Replace holder, if defective. Use
plastigauge to m easure the oil clearance betw een the
crankshaft center journal and the bearing. If oil clear­
ance exceeds allow able lim its, either replace the bear­
ing or grind the crankshaft center journal and use an
undersize bearing.
□ Standard Oil Clearance = 0.0015-0.0036 Inch
(0.039-0.092mm)
□ Allowable Limit = 0.0078 Inch (0.2mm)
1
SECTION 2.4
DISASSEMBLY AND INSPECTION
CRANKSHAFT JOURNAL DIA. BEARING SIZE
1.B09S-1.8100tnch
(45.964-45.975mm)
Standard
1.7998-1.8002 inch
(45.714-45.725mm) iTSSmrfniS:
L7899-1.7903 fcich
(45.464-45.475mm)
0.50mm U.S.
Carefully inspect the THRUST W ASHER for w ear,
poor contact, burning, other defects. Replace w asher if
It is dam aged or defective.
□ Standard Thickness of Thrust Washer
0.079 Inch (1.95-2.0mm)
□ Allowable Limit = 0.071 Inch (1.8mm)
0.077-
Bearing holder (Upper)
Metal ,
(Upper) Oil groove
A
‘ Bite -^-Chamfered part
Thrust Chamfered part
washer
Figure 23. M ain Bearing Holders
Reassem ble the bearing holder, center bearing
and thrust w asher as follow s:
1. Face the cham fered part of the bearing holder tow ard
the front. Install the bearing holder w hich has reference
bite at its center. Then, install the bearing holder w hich
is to be m ounted at the flyw heel side.
2. Install the thrust w asher. Face oil groove of thrust
w asher tow ard the thrust face of crankshaft.
3. Place the bearing w ith oil groove at the upper side.
Place the bearing w ithout oil groove at the low er side.
NO TE: Tightening torque of bearing holder Is 18-22
foot-pounds (2.S-3.0 m -kg).
INSPECTION
Crankshaft Bearing
1. Check crankshaft bearir^s for peeling, w eld cracks,
burning, poor contact, etc. Replace beanng(s), if defec­
tive.
2. Use a cylinder gauge and m icrom eter to m easure oil
clearance betw een the bearing and the crankshaft jour­
nal.
PAGE 2.4-7