Reconditioning 37-Series V-8 Cylinder Blocks - Cadillac 1937 LaSalle VVI Information

79
E N G I N E
recommended procedure on a l l V - 1 2 a n d V - 1 6
engines. Reground cylinder blocks, fitted w i t h
pistons, rings, a n d piston pins, are available for
V-12 and V - 1 6 engines through the factory Parts
Division, i n .015 a n d .030 inch oversizes.
When ordering V-12 and V-16 cylinder blocks,
first determine the amount of wear on the blocks
to be returned for exchange. If standard size
blocks show less than .012 inch wear or out-of-
round, they m a y be returned i n exchange for first
oversize blocks. If the wear exceeds .012 inch,
but is less than .027 inch, second oversize blocks
should be used.
13. Reconditioning 37-series V - 8 Cylinder
Blocks
The following procedure is recommended for
boring a n d honing of all 37-series V - 8 cylinder
blocks in the service station. Special T o o l
H M O - 1 9 0 is used to perform this operation
because its use enables the j o b t o be done without
removing the engine from the car.
Boring Out Cylinders
1. Clean the top of the motor block thoroughly,
as the success of the operation depends upon a
level base for the tool. Use a file to remove a l l
carbon and burrs.
2. Measure a l l cylinders w i t h a gauge-type
inside micrometer to determine t h e ' cylinder
showing the greatest amount of wear.
3. U s i n g the special micrometer shown i n
Plate 30, F i g . 14, set the cutting tool to the correct
size and lock i n position. A l l o w .0015" for honing
to bring the cylinder to the exact size.
4. Place the anchoring device, cross bar a n d
expanders i n the cylinder next to the one that is
to be bored. T h e cross bar should be properly
placed on the bottom of the cylinder, and the
expanders firmly expanded against the cylinder
wall.
5. Place the tool o n the engine block, sliding
the base under the anchoring screw, a n d lower
the cutting head into the cylinder to be bored.
6. Locate the centering clogs about 3 inches
.down from the top of the cylinder. T h e centering
dogs are controlled b y the k n u r l - k n o b at the top
of the tool. T h e tighter the knurl-knob, the
better the centering of the tool. After the tool is
centered— .
7. T i g h t e n down the anchoring screw to elim-
inate all possibility of the tool slipping while i n
operation.
' 8. Release the centering dogs a n d raise the
cutting head.
9. W i t h the cutting head raised, push the
centering clogs back into their proper position so
that they cannot touch the cylinder wall i n the
boring operation.
10. Install cutter holder in boring bar and
lock i n position.
11. Bore o u t cylinder.
Honing—
After the cylinder has been bored out, it should
be honed to the exact size required for a perfect
piston fit. F o r this purpose, it is recommended
that a wet hone be used. W i t h the roughing
stones, approximately .001" should be honed out,
and then w i t h the fine 400 or 500 grit finishing
stones, take o u t about .0003".
W h e n this has been done, the cylinder should
be carefully inspected for tool marks. Also, the
taper should be checked w i t h a dial indicator.
W h e n inspecting the cylinder walls for finish, use
a light i n the crankcase a n d the slightest imper-
fection i n the cylinder wall will be shown up
clearly.
After completing the above operation, the
cylinders will be from .0002 to .0003" undersize,
and from this point the pistons should be fitted.
Piston Fit
T h e size of the pistons received from the P a r t s
D i v i s i o n will v a r y w i t h i n .0015". Check each
piston i n a l l the cylinders, using both a .002" a n d
a .0025" feeler gauge. D u e to the variation i n
piston size, some m a y fit at this point. T h e
remaining cylinders should be honed w i t h the
500 grit stones u n t i l each piston is properly
fitted. After a l l the pistons have been fitted they
should be marked and set aside while the crank-
case is being cleaned out.
Kerosene should be used to clean the crankcase.
After it has been thoroughly cleaned, out, the o i l
lines should be blown out to remove a l l of the
boring chips a n d any vestige of honing grit that
might have lodged i n them.
After these operations have been completed,
the pistons should be installed i n their respective
7. Turn down
fig. 78 Tightening Cylinder Heads Series 37-85
and 90