Generac 86640 - Manual (Page 106)

Table 11.4- Tightening Torques for Stan­
dard Metric Bolts
GRADE
TORQUE
SIZE N-m fRBs
M6 3-4 2.2-2.9
M8 8-11 5.8-8.0
4T M10 16-22 12-16
M12 26-36 20-27
M14 46-62 34-46
M6 6-7 4.3-5.1
M8 14-18 10-13
7T M10 25-35 19-26
M12 45-61 33-45
M14 76-103 56-76
M6 8-11 5.8-8.0
M8 19-25 14-18
9T M10 36-50 27-37
M12 65-88 48-65
M14 109-147 80-108
Table 11.5- Engine Service Data
COMPRESSION PRESSURE (@ 350 RPM):
Standard..................... .. .......... 192 psi (13.5 kg/cm^)
Minimum................................... 164 psi (11.5 kg/cm^)
Maximum Difference
Between Cylinders .................. 14.0 psi (1.0 kg/cm*)
CYLINDER HEAD FLATNESS:
Standard................................... Less than 0.0020 Inch
Limit.......................................... 0.004 Inch (0.1mm)
VALVE DATA:
Valve Head Diameter “D"
Intake................................1.358 inch (34.5mm)
Exhaust............................ 1.18 Inch (30.0mm)
Valve Length "L"
Intake................................4.2736-4.2854 inch
(108.55-108.85mm)
Exhaust............................ 4.2539-4.2657 Inch
(108.05-108.35mm)
Valve Stem Diameter "d"
Intake................................0.2744-0.2750 inch
(6.970-€.985mm)
Exhaust............................ 0.2734-0.2740 Inch
((6.945-6.960mm)
Valve Seat Angle "a"
Intake and Exhaust............45* 15'-45* 45’
Valve Margin ("T") Limit _____ 0.020 inch (0.5mm)
Valve Stem End Surface
Grinding Limit............................ 0.008 Inch (0.2mm)
Valve Clearance (Hot)
Intake.................................0.0098 Inch (0.25mm)
Exhaust............................. 0.0118 Inch (0.30mm)
Valve Clearance (Cold)
Intake and Exhaust............0.009 inch (0.22mm)
VALVE SPRING:
Pree Height......... ..................... 1.8386 Inch (46.7mm)
Pressure Height........................ 1.122 Inch @ 36.4 lbs
(28.5mm @ 55.6kg)
Assembled Height..................... 1.457 inches @ 36.4 lbs
(37.0mm @ 16.5kg)
Out-of-Square........................... 0.079 Inch (2.0mm)
VALVE GUIDE:
Standard O.D. .. ....................... 0.4340-0.4344 Inch
(11.023-11.034mm)
Service Limit O.D.............. .. 0.4418-0.4423 Inch
(11.223-11.234mm)
Valve Guide I.D......................... 0.2758-0.2764 inch
(7.005-7.020mm)
Cylinder Head Valve Guide Hole Diameter
Standard ...........................0.4315-0.4322 Inch
(10.960-10.978mm)
Service Limit.....................0.4394-0.4401 inch
(11.160-11.178mm)
Interference Fit of
Valve Guide...............................0.0018-0.0029 inch
(0.045-0.074mm)
Valve Stem to Valve Guide Clearance
Intake (Standard)..............0.0006-0.0018 inch
(0.015-0.045mm)
Exhaust (Standard) _____ 0.0018-0.0030 inch
(0.045-0.075mm)
Maximum Tolerance____ 0.004 Inch (0.1mm)
Valve Deflection Limit . .0.008 inch (0.2mm)
CAMSHAFT & CAMSHAFT BEARING:
Camshaft Journal to Bearing Clearance
Standard ...........................0.0012-0.0028 inch
(0.03-0.07mm)
Maximum Tolerance.................. 0.0059 Inch (0.15mm)
Camshaft Bearing I.D................ 1.5748-1.5760 Inch
(40.00-40.03mm)
Camshaft Journal O.D............... 1.5728-1.5736 Inch
(39.95-39.97mm)
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