Removal And Installation Of Piston Pins; Measuring Piston Clearance; Worn Cylinder Blocks - Cadillac 1937 LaSalle VVI Information

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E N G I N E
2. Press the bushing into the rod, using the
bushing replacer and a 2 or 3 ton arbor press.
3. Pass the burnishing tool through the bush-
ing. Use kerosene as a lubricant for the. expand-
ing and burnishing operation.
Note: When expanding or burnishing the bush-
ing, a heavier arbor press of about 4 tons
capacity should be used.
4. If the bushing moves during the burnishing
process, it is too loose. It should be removed and
another one installed.
5. If the correct clearance between the piston
pin and the bushing is not secured after the first
burnishing, the burnishing operation should be
repeated in order to increase the size of the piston
pin hole.
6. After installing the bushing, the parts should
be thoroughly cleaned and the o i l passages blown
out w i t h air to remove chips and dirt.
The press plate used during these operations has
two holes—one used for assembling, expanding
and burnishing—and the other for removing the
bushing,
10. Removing and Installing Piston P i n s
Removal—Series 37-50, 60, 65, 70 and 75:
1. Remove snap ring that holds piston p i n in
place in piston.
2. Place the piston in boiling water to expand
the piston pin hole.
3. - P u s h piston p i n out of piston b y hand from
the raised rib side of the piston hole boss as shown
in Plate 29, F i g . 11.
Note: Never use an arbor press to remove piston
pins because the pressure may distort or
crack the piston.
Installation—Series 37-50, 60, 65, 70 and 75
. 1. Lubricate piston p i n w i t h engine o i l .
2. H e a t the piston in boiling water.
3. Push the pin into the piston b y hand from
the side opDOsite the boss w i t h the raised rib.
See Plate 29, F i g . 11.
Removal—Series 37-85 and 90.
1. Remove piston p i n locking screw.
2. H e a t piston in boiling water to expand
piston pin hole.
3. P u s h the piston p i n out b y hand from the
locking screw side as shown in Plate 29, F i g . 10.
Note: Do not use an arbor press for this opera-
tion.
Installation—Series 37-85 and 90.
1. Lubricate piston p i n w i t h engine o i l .
2. H e a t piston in boiling water.
3. Push piston pin into piston b y hand from
-the side opposite the locking screw. See Plate 29,
Fig. 10.
11. Measuring Piston Clearance
When fitting anodized a l u m i n u m pistons, two
feeler gauge ribbons of different thickness should
be used. These ribbons should be from s
s
to x /i
inch wide and, for convenience, from 7 to 10
inches long. T h e following thicknesses are
required:
Thin Thick
Gauge Gauge
Series 37-50, 60, 65, 70, 75. .002" .0025".
Series 37-85, 90 .0015" .002"
The ribbon should be placed at the high spot of
the piston next to the " T " slot as shown in Plate
29, F i g . 13. W i t h the feeler gauge in the above
location in • the cylinder and the piston in its
running position, the piston should drop of its
own weight w i t h the t h i n feeler and hold tightly
in place w i t h the thick feeler.
F o r convenience, the fit trials may be made
w i t h the upper end of the piston just sufficiently
above the top of the cylinder to hold it w i t h the
fingers. The feeler ribbon, the piston, and the
cylinder wall should be clean, and the ribbon
must be free from kinks and wrinkles when fitting
pistons.
Replacement pistons are furnished b y the
factory Parts D i v i s i o n in the following oversizes:
A l l V - 8 ' s . V-12 and V-16
Standard Standard
.003 Oversize .005 Oversize
.005 Oversize .015 Oversize
.010 Oversize
.015 Oversize
.030 Oversize
P i s t o n diameters, as given in the specification
table, can be measured w i t h a large-micrometer,
as shown i n F i g . 12. T h e measurements must be
taken on the large diameter, w h i c h , i s 90° from
the piston p i n hole. Measure at two points; just
above the lower edge and just below the lower
ring groove.
Before ordering pistons for replacement, it is
extremely important to determine the size of the
cylinder bores b y actual measurement. T h i s is
essential because the cylinder bore m a y have been
enlarged b y refinishing without being marked
"oversize." A c t u a l measurement at the time
of replacement is the only certain way of avoiding
•errors in ordering. Cylinder bore diameters must
be measured accurately w i t h an inside micrometer
or dial indicator as shown in Plate 30, F i g . 16.
12. W o r n Cylinder Blocks
T h e cylinder blocks of series 37-50, 60, 65; 70
and .75 engines w i t h a single casting for both
cylinder blocks and crankcase can be reconditioned
most advantageously in the service station. T h e
recommended procedure for boring and honing
these blocks is given i n N o t e 13.
T h e cylinder blocks of Series 37-85 and 90
engines cannot be reconditioned in the service
station w i t h the same precision and accuracy that
can be held on the V - 8 blocks. Replacement w i t h
factory-reground cylinder blocks is, therefore, the