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SPECIFICATIONS
Page 317
Ring Groove Service Limit, Top
(over 0.120 in./3.048 mm pins)
4.912 in.
124.765 mm
PISTON RINGS
Compression Ring End Gap (No. 349GC3101)
0.016–0.028 in.
0.406–0.711 mm
Compression Ring End Gap (No. 349GC3102)
0.013–0.025 in.
0.330–0.635 mm
Oil Control Ring End Gap (No. 350GC340)
0.013–0.028 in.
0.330–0.711 mm
Piston Ring Side Clearance (new)
0.0016–0.0030 in.
0.0406–0.0762 mm
Piston Ring Side Clearance (used)
Maximum 0.0045 in.
Maximum 0.1143 mm
Note: End gap checked in 4.875 gauge diameter. For every 0.001-inch (0.0254-mm) increase in gauge diameter, ring gap will
increase by 0.003 inch (0.076 mm). Refer to a MACK branch or dealer for specifications for piston ring part numbers not
listed above.
ROCKER ARM
Rocker Arm Ratio
1.5:1
Rocker Arm Hole ID
1.1306–1.1326 in.
28.7172–28.7680 mm
Rocker Arm Hole-to-Shaft Clearance
0.004–0.0015 in.
0.1016–0.0381 mm
Rocker Arm Shaft OD
1.1286–1.1291 in.
28.6664–28.6791 mm
Push Rod Overall Length
(from ball end, 0.560 in./14.224 mm ball placed in cup)
14.108–14.170 in.
358.343–359.918 mm
TIMING GEAR AND FRONT COVER
Idler Gear to Camshaft Gear Backlash
0.001–0.008 in.
0.025–0.203 mm
Camshaft Gear to Auxiliary Shaft Gear Backlash
0.001–0.009 in.
0.025–0.229 mm
Camshaft Gear to Fuel Supply Pump Gear Backlash
0.001–0.008 in.
0.025–0.203 mm
Crankshaft Gear to Idler Gear Backlash
0.001–0.008 in.
0.025–0.203 mm
Dowel Pin Holes (both, in cylinder block)
0.4987–0.4997 in.
12.6670–12.6924 mm
Dowel Pin Hole (round pin, in front cover, RH)
0.5005–0.5012 in.
12.7127–12.7305 mm
Dowel Pin Hole (blade pin, in front cover, LH)
0.5577–0.5584 in.
14.1656–14.1834 mm
Dowel Pin OD (round pin, RH)
0.5001–0.5003 in.
12.7025–12.7076 mm
Dowel Pin OD (blade pin, in cylinder block, LH)
0.5001–0.5003 in.
12.7025–12.7076 mm
Dowel Pin OD (blade pin, in front cover, LH)
0.5570–0.5575 in.
14.1478–14.1605 mm
Crankshaft Seal Mounting Bore
3.9995–4.0025 in.
101.5873–101.6635 mm
Timing Gear Cover Seal Mounting Bore to Crankshaft
Runout
0.015 in. TIR (Max)
0.381 mm TIR (Max)
Timing Gear Cover Seal Square to Crankshaft
0.010 in. (Max)
0.254 mm (Max)
Hydraulic Steering Pump Mounting Bore
3.2525–3.2545 in.
82.6135–82.6643 mm
Note: Must be held relative to main bearing bores. Check runout with an alignment bar installed through the cylinder block
main bearing bores.
TURBOCHARGER
Shaft End Play (models S300, S400)
0.003–0.006 in.
0.0762–0.1524 mm
Bearing Radial Check (measured at bearings)
0.018–0.029 in.
0.4572–0.7366 mm
VALVES
Lash Setting (Rocker Arm to Valve Guide Yoke Clearance)
Cold*
Inlet (adjustment at scheduled intervals)
0.016 in.
0.406 mm
Tolerances Are Shown Low to High
Standard Size or Fit
Component
English
Metric
5_106_00.bk Page 317 Friday, August 4, 2000 11:17 AM
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