Page 44
DESCRIPTION & OPERATION
Gear Train
The gear train of the E-Tech™ engine (Figure 46)
is designed to accommodate the large diameter
camshaft and the addition of electronic unit
pumps. The major changes include all new gears,
an added idler gear, and camshaft and auxiliary
gears that rotate in opposite directions than the
E7. In addition, the power steering pump and air
compressor rotate in opposite directions and the
oil pump drive gear helix has been reversed to
maintain pumping direction.
The larger camshaft on the E-Tech™ had to be
relocated upward and outward from the original
E7 location in order for the engine camshaft to
drive the unit pumps. This placed the camshaft
further away from the crankshaft and, as a result,
larger timing gears are required. An idler gear is
used between the crank and cam gears. This
keeps the gear sizes from becoming too large
and keeps the engine timing gear flange and
timing gear cover from requiring enlargement.
46
Figure 46 — E-Tech™ Gear Train
1. Fuel Pump Gear
2. Camshaft Gear
3. Idler Gear
4. Crankshaft Gear
5. Auxiliary Shaft Gear
5_106_00.bk Page 44 Friday, August 4, 2000 11:17 AM
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