SPECIFICATIONS
Page 475
FUEL SUPPLY PUMP
Pump Gear End Play (steel gear) 0.008 in. (Max) 0.203 mm (Max)
Pump Gear End Play (plastic gear) 0.019 in. (Max) 0.483 mm (Max)
IDLER GEAR
Gear Journal Clearance 0.0027–0.0062 in. 0.069–0.158 mm
Gear End Play 0.003–0.009 in. 0.076–0.228 mm
JACOBS ENGINE BRAKE
Slave Piston Lash Adjustment 0.021 in. 0.381 mm
POWERLEASH™ ENGINE BRAKE
Hydraulic Actuator Lash Adjustment 0.045 in. 1.14 mm
OIL PUMP
Gear-to-Cover End Clearance 0.0035–0.0060 in. 0.089–0.152 mm
Oil Pump OD-to-Cavity Clearance 0.003–0.0045 in. 0.076–0.114 mm
Oil Pump Gear Backlash (inside pump) 0.008–0.022 in. 0.203–0.559 mm
Oil Pump Drive Gear-to-Driven Gear Backlash 0.006–0.016 in. 0.152–0.406 mm
Relief Valve Spring (free length) 6.4 in. 162.6 mm
Relief Valve Spring Pressure (compressed to
5.56 in./14.12 cm)
63 lbs. 28.6 kg
Relief Valve Opening Pressure 90–115 psi 621–793 kPa
PISTON
Top Extension Above/Below Cyl. Block Deck at TDC +0.020 to −0.002 in. +0.508 to −0.051 mm
Wrist Pin Bore 2.2501–2.2509 in. 57.153–57.173 mm
Wrist Pin Length 3.820–3.825 in. 97.028–97.155 mm
Wrist Pin-to-Piston/Bore Clearance 0.0012–0.0021 in. 0.0297–0.0547 mm
Wrist Pin OD 2.24875–2.24895 in. 57.11825–57.12333 mm
Piston-to-Liner Clearance (Two-piece piston, 90 degrees
from pin axis)
0.0030–0.0050 in. 0.0762–0.1270 mm
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. 349GC3113) 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
Tolerances Are Shown Low to High Standard Size or Fit
Component English Metric
5-111.bk Page 475 Monday, July 10, 2006 2:26 PM
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