Cadillac 54-6219 1954 Shop Manual page 169

ENGINE MECHANICAL
Cast aluminum pistons with
a
tin
coating
are used
in the engine. flm slipper type pistons are cut sea
at the skirt helow the piston pill to allow for rica
r
ance between the crankshaft counterweights and
piston skirt when the piston
is
at the heLium of
stroke.
The piston pins are press fitted into 1151 connect
ing rods. Holes drilled from the piston skirt into
he piston pin bores direct oil [rem the cylinder
walls to the piston pin to assure adequate Inhn
-
cation.
A chain driven camshaft is supported by five
bearings. Wide camshaft lobes allow a molimlun of
lobe wear. Both the crankshaft and canshitt spree
-
kots have a punched locating mark ft,r correeL
valve inning when ins's II ng the iming
cluün
The camshaft gear is cast as an integral part of
the camshaft and meshes with tine distrihuLor drive
gear which Is an integral parL ufthe distributor. Fig
l02. The distrthutor drive ehaft, rotating in a
COUNTIiRCLOCKWISE direcLicin when viewedfrom
above, drives the nil pump and vacuum pump. The
vacuum pump is attached tn Lhe underside of the
oil pump and is driven by a hexagonal drive shaft
between the two pumps
I lydraulic valve lifters are used in
maintain
zkru clearance IhrnuinuL
Lhe valve traiti
-
Thu
arrangement assures quiet oprratiun and ci innii
-
atcs the necessity for valve tapt adjustments.
The l liters operate in guide hales drilled
:I
:1
'C
cylinder bluck. The valve lifter plunger and lifter
hody are !n matched pairs. llie push rods vine in
cups in rue lifters and extend lip throLigh openings
in the cylinder block end cylinder head In the ,-iicker
arm. AJL
engine cross seahea showing die valve
operating mechanism
e illLIsraLeu in hg. 0-3.
ENGINE 1.1 lhi ECATING SYSTEM
- -
Ihc nil
pump is nioujited oii the rear main bearing cap.
Oil enters the pomp LhI-ough a screened icLake
Fig. 111-4. which floats no the oil thereby drawing
off only the eleanor eurface nil
-
Oil i.s forced h the pump tl ro Ligli
Li
inn in
bearing rap to
liv evriLal oil header which firer
feeds Lhe rear nan in hearing. Fig. 0-4. Tue rear
cnnneciing rod journal a lubricated hr oil from
the rear ma in hearing through a drilled hole in
the crankshaft.
The vertical nil header is imaersected.hv the right
longitudinal header through which a portion of the
Fig. iOI Engine Side Vke