Mack E7 - Page 48

Page 2-18
200 SPECIFICATIONS
PISTON (CONT.)
Ring groove service limit over 0.120 inch pins (3.048 mm)
Top groove 4.912 in. 124.765 mm
PISTON RINGS
Piston ring end gap — when checked in 4.875 gauge diameter
Compression rings — No. 349GC3101 0.016–0.028 in. 0.406–0.711 mm
Compression rings — No. 349GC3102 0.013–0.025 in. 0.330–0.635 mm
Oil control ring — 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: Refer to MACK branch or distributor for specifications for piston ring part numbers not listed above.
NOTE: For every 0.001 in. (0.0254 mm) increase in gauge diameter, ring gap will increase by 0.003 in. (0.076 mm).
ROCKER ARM
Ratio 1.5:1
Hole ID 1.1306–1.1326 in. 28.7172–28.7680 mm
Hole-to-shaft clearance 0.004–0.0015 in. 0.1016–0.0381 mm
Shaft OD 1.1286–1.1291 in. 28.6664–28.6791 mm
Push rod overall length — intake and non-brake exhaust (flat to
cup top)
15.751–15.813 in. 400.075–401.650 mm
Push rod overall length — exhaust w/Dynatard (flat to flat) 16.353–16.388 in. 415.366–416.255 mm
TIMING GEAR COVER
Dowel Pins
Holes in cylinder block (both) 0.4987–0.4997 in. 12.6670–12.6924 mm
Hole in timing gear cover — RH for round pin 0.5005–0.5012 in. 12.7127–12.7305 mm
— LH for diamond pin 0.5577–0.5584 in. 14.1656–14.1834 mm
Pin OD — RH for round pin 0.5001–0.5003 in. 12.7025–12.7076 mm
— LH for diamond pin, cylinder block end 0.5001–0.5003 in. 12.7025–12.7076 mm
— LH for diamond pin, timing cover end 0.5570–0.5575 in. 14.1478–14.1605 mm
Crankshaft seal mounting bore 3.9995–4.0025 in. 101.5873–101.6635 mm
Seal square to hub 0.010 in. 0.254 mm
Seal mounting bore-to-crank runout 0.015 in. T.I.R.* 0.381 mm*
Hydraulic steering pump mounting bore 3.2525–3.2545 in. 82.6135–82.6643 mm
* Must be held relative to main bearing bores. Check runout with an alignment bar installed through the cylinder block main
bearing bores.
TIMING GEAR
Backlash — injection pump drive gear to injection pump
driven gear
0.0025–0.0095 in. 0.0635–0.2413 mm
— all other gears 0.0013–0.0108 in. 0.0330–0.2743 mm
Fits and Limits (Cont.)
Component
Standard Size or Fit
English Metric
5-101.bk Page 18 Friday, March 17, 2006 11:05 AM