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Page 46
DESCRIPTION & OPERATION
Front Cover
Refer to Figure 49.
The front cover has been designed with a boss
for the automatic belt tensioner, room for the idler
gear, a mounting for the crankcase breather, and
a boss for the engine position sensor.
49
Figure 49 — Front Cover
CRANKCASE BREATHER
A noticeable feature of the front cover is the
crankcase ventilation assembly. The E-Tech™
engine has a crankcase breather filter assembly
which mounts on the engine front timing gear
cover. This system traps, collects and returns oil
to the engine crankcase that would otherwise be
lost with blow-by gases (Figure 50).
During operation, blow-by gases from the engine
pass upward through the filter element, then
down and out through the center standpipe,
which exits from the canister lower-outboard side.
When blow-by gases pass through the filter
element, oil collects on element surfaces and
then drains back into the crankcase.
50
Figure 50 — Crankcase Breather Operation
(Cast-Aluminum Housing Shown)
Early-production engines are equipped with a
cast-aluminum crankcase breather housing,
whereas, current-production engines are
equipped with a housing made of fiberglass-
reinforced nylon (Figure 51). The breather
element, housing mounting gasket and O-rings
are NOT interchangeable between the two
housing designs.
The canister lid and element are removable to
allow element cleaning.
5_106_00.bk Page 46 Friday, August 4, 2000 11:17 AM
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