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DESCRIPTION & OPERATION
VALVE LIFTER/EUP OIL GALLERY
Refer to Figure 53.
A second oil gallery, located above the camshaft,
supplies oil to the valve lifter bores and EUP
bores. Oil is fed to this gallery by drilled passages
from the No. 2 and No. 5 cam bores which also
feed oil to the cylinder head rocker arm shaft and
engine brake assemblies. The No. 2 and No. 5
main bearing bores are grooved to satisfy the
additional oil flow required by this second oil
gallery. The tappet guide pins in the EUP bores
are factory-installed in all cylinder blocks and
should not be removed.
OIL PASSAGES
r
The passage from the main oil gallery to the
No. 1 main bearing bore intersects the idler
gear hub bore to provide lubrication to the
idler gear bushing.
r
There are two oil annulus passages in the
No. 2 and No. 5 main bearing bores. These
passages, together with the groove in the
upper bearing inserts, ensure a high volume
of oil to the right-side oil gallery.
r
Valve lifter (roller follower) bores intersect
the right-side oil gallery.
r
Passages drilled through each EUP bore
and into the adjacent valve lifter bore
provide oil feed to each EUP.
53
Figure 53 — Sectioned View, Front of E-Tech™ Engine Block
5_106_00.bk Page 48 Friday, August 4, 2000 11:17 AM
BDC for engine manuals and specs
