DESCRIPTION AND OPERATION
Page 73
Lubrication System
ASET™ engines have oil galleries at both the left
and right sides of the cylinder block. The galleries
along with the corresponding passages supply
lubricant oil to the moving components of the
engine. Identification and description of both
galleries and information for the oil pump, oil
cooler and filters are included below.
MAIN OIL GALLERY
The main oil gallery on the left side of the engine
is divided into two sections. The front section
supplies oil through passages to the Nos. 1, 2
and 3 crankshaft journal bores and from there to
the Nos. 1, 2 and 3 camshaft bores. Oil is also
supplied to the idler gear bore and to the piston
cooling nozzles of the Nos. 1, 2 and 3 cylinders. A
3/4-inch cup plug is used to close the passage at
the front of the block (Figure 85).
85
Figure 85 — Gallery Cup Plug
The rear section of the main oil gallery supplies
oil through passages to the Nos. 4, 5, 6 and 7
crankshaft journal bores and from there to the
Nos. 4, 5, 6 and 7 camshaft bores. Oil is also
supplied to the piston cooling nozzles.
VALVE LIFTER/EUP OIL GALLERY
Refer to Figure 86.
A second oil gallery, located above the camshaft,
supplies oil to the valve lifter bores and EUP
bores. Oil is fed to the two sections of this gallery
by drilled passages from the No. 2 and No. 5 cam
bores which also feed oil to the cylinder head
rocker arm shafts and engine brake assemblies.
The No. 2 and No. 5 main bearing bores and the
No. 2 and No. 5 cam journals are grooved to
satisfy the additional oil flow required by this
second oil gallery.
OIL PASSAGES
앫 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.
앫 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 and the groove around
the No. 2 and No. 5 cam journals, ensure a
high volume of oil to the right-side oil gallery.
앫 Valve lifter (roller follower) bores intersect
the right-side oil gallery.
앫 Passages drilled through each EUP bore
and into the adjacent valve lifter bore
provide oil feed to each EUP.
1. Main Oil Gallery 2. Cup Plug, 3/4-Inch
5-111.bk Page 73 Monday, July 10, 2006 2:26 PM
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