GMC 1976 ZEO 6083 Maintenance Manual page 728

6KW MODEL
51
- Intake 70° F . ......... .. .. .. .. . .. .. .. .. . .003"
Valve Tappet Clearance
- Exhaust 70° F ... .. .. .. .. . .. .. .. .. .. .... .010"
Valve Tappet Clearance
ONAN MOTOR GENERATOR
24C-
MINIMUM INCHES
MAXIMUM
Piston Clearance in Cylinder
Solid Type-Measured
.10 Below Oil Controlling
Ring - 90° From
Pin .. .. .. .. ......... .. .. . . .. . .. .. .. .. ..... ... . .
.001
- .003
Cylinder Bore-Honed Std. .. .. .. .. ......
3.1245 - 3.1255
CRANKSHAFT AND CAMSHAFT
Crankshaft Main Bearing
Journal to Bearing
Clearance Steel Backed
Aluminum .. ......... .. .. .. .. . . . .. .. .. ......... .
.0025 - .0038
Crankshaft End Play . ..... .. .. .. .. . .. .. .. .. . .006 -
.012
Camshaft End Play . .. .. .. ... .. .. .. .. ..... .. .. . .003"
Crankshaft Rod Journal to
Rod Bearing Clearance.
Aluminum Rod . ......... .. .. .. . . . .. .. .. ... .0020 -
.0033
Connecting Rod End Play .. .. ..... .. .. . .002 -
.016
Timing Gear Backlash .... .. .. .. . .. .. .. .. ... .002 -
.003
Oil Pump Gear Backlash .. .. .. ..... .. .. . .002 -
.005
TAPPET AND VALVES
Tappet to Cylinder Block
Clearance .. .... ....... .. .. .. . . . .. .. .. .. ........ .0015 -
.0030
Valve Seat Width . .. .. .. .. .. . .. .. .. .. ..... .. .. . 1/32 -
1/8
Valve Stem to Guide -
Intake .. .. .. .. .. ......... .. .. .. .. . . . .. .. .. ....... .. . .0010
-
.0025
Valve Stem to Guide -
Exhaust ..... .. .. .. .. . . . .. .. .. ....... .. .. .. . . .. . . . .0025
Valve Face Angle . .. ....... .. .. .. .. .. . .. .. .. .. .
44°
Valve Seat Angle . .. ......... .. .. .. .. . .. .. .. .. .
45°
Valve Tappet Clearance
Intake .. .. .. ....... .. .. .. .. ... .. .. .. .. ... ...... .. .. .. ...
Exhaust .. .. .... ....... .. .. .. .. ..... .. .. .. .. .. ... .. .. .. .
Valve Stem in Guide - Intake .. .. . .. .. .. .
Valve Stem in Guide - Exhaust . .. .. ...
0.001 1,
0.0025"
0.003"
0.012
,
-
-
0.0025"
0 .004"
Valve Spring Length
Free Length . .. .. .. .. .. ... .. .. .. .. ..... .. .. .. .. .. .. . 1 .662
,
Compressed Length .. .. .. ........... .. .. .. . 1 .375"
Valve Spring Tension (lb)
Open . . .. .. .. ........... .. .. .. .. . .. .. .. ........... .. .. .. . 71 -
79
Closed .. .. . . . .. .. .. .. .. .. ..... .. .. .. .. ... .. .. .. .. .. ..... 38 -
42
Valve Seat Bore Diameter
Intake .. .. . .. .. .. .. ........... .. .. .. . .. .. .. .. ........... 1 .5645" -
1 .5655"
Exhaust .. . . . .. .. .. .. .. .. .. ... .. .. .. .. ..... .. .. .. .. ..... 1 .2510" -
1 .2520"
Valve Seat Diameter
Intake .. .. .. ....... .. .. .. .. .. . .. .. .. .. ......... .. .. .. .. .
1 .569"
-
1 .570
,
Exhaust .. . . ....... .... .. .. .. .. . . . .. .. . .. ........ . . .. .. . 1 .255" - 1 .256"
Valve Stem Diameter
Intake .. .. .. ...... . .... .. . . .. .. .... . .. .. .. . .. .... .. . . . . .
0.3425"
- 0.3430
,
Exhaust . . .. . .. . . . . .. .. .. . . ... .. .. . . .. ..... .. .. .. .. ..... 0.3410" - 0.3415"
Valve Guide Diameter (I .D .) ........... .. .. .. . 0 .344" - 0.346"
Valve Lifter Diameter .. .. .. .. . . . .. .. .. ........... 0.7475" - 0.7480"
Valve Lifter Bore . .. ....... .. .. .. .. . .. .. .. .. .. .......
0.7500" - 0.7515"
Valve Seat Interference Width . ........... 1/32" -
3/64"