Generac Power Systems 53187 - Manual (Page 62)

PART 2
ENGINE MECHANICAL
Engine Tolerances
MAIN REVOLVING SYSTEM (CONT’D);
Connecting Rod (Continued):
Connecting Rod to
Crankpin Oil Clearance
Allow able Lim it.................... 0.008 Inch
Connecting Rod
Bolt Torque ........................ 22-25 Ft.-Lbs.
Crankshaft:
Standard Diam eter of
Main Journal ...................... 1.8110 inch
Standard Tolerance of
Main Journal ...................... 1.8096-1.8100 Inch
Allow able Lim it of
Main Journal ...................... 1.7874 Inch
Main Journal Undersize_____ 0.010, 0.020 Inch
Cram kpln Standard
Diam eter ............................ 1.5354 Inch
Crankpin Standard
Tolerance............................ 1.5340-1.5344 inch
Allow able Crankping Lim it .. 1.5118 Inch
Crankpin Undersize.............. 0.010, 0.020 inch
Standard Crankshaft
Deflection........................... Less than 0.001 inch
Maxim um Allow able
Crankshaft Deflection .......... 0.002 inch
Standard Axial
Crankshaft Play................... 0.002 inch
Maxim um Allow able Axial
Crankshaft Play................... 0.020 inch
Standard Thickness of
Thrust W asher..................... 0.079 inch
Standard Tolerance
of Thrust W asher................. 0.077-0.079 inch
Maxim um Allow able Thickness
of Thrust W asher................. 0.071 inch
Tolerance of Oil Clearance
Betw een Crankshaft Journal
and Center Bearing.............. 0.0015-0.0036 Inch
Maxim um Allow able Oil
Clearance Betw een Crankshaft
Journal and Center Bearing . 0.0078 Inch
VALVE SYSTEM:
Cam shaft:
Standard Height of Cam
Tolerance for Intake &
Exhaust............................... 1.0413-1.0433 inch
Minim um Allow able Cam Height
for Intake & Exhaust ............ 1.0276 Inch
Standard Cam Height
for Injection Pum p............... 0.9425-0.9472 inch
Minim um Allow able Injection
Pum p Cam Height................ 0.9370 inch
Standard Cam Height for
Feed Pum p ......................... 1.0590-1.0630 inch
Minim um Alow able Cam Hieght
for Feed Pum p..................... 1.0236 Inch
Standard Cam Gear
Backlash ............................. 0.003 Inch
Maxim um Cam Gear
Backlash .............................0.012 inch
SECTION 2.1
ENGINE SPECIFICATIONS & CHARTS
and Fits (Continued)
^ “ (thickness)
Valves:
Standard Diam eter of
Intake Valve Stem ................ 0.
Maxim um Allow able Diam eter
of Intake Valve Stem ............. 0.
Standard Diam eter of
Exhaust Valve Stem .............. 0.
Maxim um Allow able Diam eter
of Exhaust Valve Stem ...........0,
Standard Clearance Betw een
Intake Valve Stem and Valve
Guide..................■ ............... 0.
Maxim um Clearance Betw een
Intake Valve Stem and Valve
Guide.................................. 0,
Standard Clearance Betw een
Exhaust Valve Stem and
Guide...................................0
Maxim um Clearance Betw een
Exhaust Valve Stem and
Guide...................................0
Valve Standard Thickness .. 0
Valve Thickness Standard
Tolerance.............................0
Maxim um Allow able Valve
Thickness............................. 0
Valve Clearance- Intake &
Exhaust (W hen Cold).............0
2744-0.2738 Inch
2713 inch
2740-0.2736 Inch
2693 inch
001-0.002 inch
,0079 inch
.0016-0.0026 inch
.010 Inch
.039 inch
.036-0.042 inch
,020 Inch
.008-0.020 inch
Valve Springs:
Force Required to Com press
Springs to a Length of 1.197
inch.....................................17.86 pounds
Valve Spring Standard
Free Length......................... 1.3779 Inch
Valve Spring Minim um
Free Length......................... 1.3189 Inch
Standard Valve Spring
Squareness ..........................Less than 0.047 inch
Replace Spritig if Out-of-
Square More Than................. 0.079 Inch