Chevrolet Chevelle 1977 Repair Manual page 20

IB-14
Fig. 3 9 - A s s e m b l i n g C y lin d e r Halves
Dial Indicator Set J-8001-3 may be used to determine proper
thrust race size.
PR O PE R SELEC TIO N O F T H R U ST RACES A N D
BALL SEATS IS O F EX T R E M E IM PO R TA N CE.
15. M easure clearance between rear ball of No. 1 Piston
and axial plate, in following manner:
a. Select a suitable combination of well-oiled Feeler
Gage leaves to fit snugly between ball and axial plate.
b. A ttach a spring scale, reading in 1-ounce increments,
to the feeler gage. A distributor point checking scale or
Spring Scale J-544 may be used.
c. Pull on Spring Scale to slide Feeler Gage stock out
from between ball and axial plate, and note reading on
Spring Scale as Feeler Gage is removed (Fig. 40).
should be between 4 and 8 ounces.
d. If reading in Step c. above is under 4 OR over 8
ounces, reduce or increase thickness of Feeler Gage leaves
and repeat Steps a. through c. above until a reading of 4 to
A X IA L PLATE
Fig. 40--Gagin g Rear Piston Ball
OVERHAUL MANUAL
8 ounces is obtained. Record clearance between ball and
axial plate that results in the 4 to 8-ounce pull on Spring
Scale.
16. Now rotate shaft 120° and repeat Step 15 between
same ball and axial plate. Record this measurement.
If shaft is hard to rotate, install shaft nut onto shaft and
turn shaft with wrench.
17. R otate shaft another 120° and again repeat Step 15
between these same parts and record measurements.
18. Select a "numbered" shoe disc corresponding to
minimum feeler gage reading recorded in the three checks
above. (See example in Fig. 42). Place shoe discs in Parts
Tray J-9402 com partm ent corresponding to Piston No. 1
and rear ball pocket position.
Shoe
thousandths) variations, There are a total of 11 sizes
available for field servicing. All shoe discs are marked with
the shoe size, which corresponds to the last three digits of
the piece part number. (See Shoe Disc size Chart in Fig. 41
above.)
Once a proper selection of the shoe has been
made, THE MATCHED CO M BINA TIO N OF SHOE
DISC TO REAR BALL AND SPHERICAL CAVITY
IN PISTON
RELATIONSHIP during disassembly after gaging
operation, and during final assembly of internal
mechanism.
19. Repeat in detail the same gaging procedure outlined
in Steps 15 through 18 for Piston No. 2 and No. 3.
20. M ount Dial Indicator J-8001-3 on edge of
Compressing Fixture J-9397 with Clamp J-8001-1 and
Sleeve J-8001-2 (Fig. 43). Position Dial Indicator on rear
end of shaft and adjust to "zero".
Apply full hand-force at end of mainshaft a few times
before reading clearance. This will help squeeze the oil out
from /between mating parts. Push upward and record
measurement.
Reading
therefore, reading must be estimated to nearest .0005".
An alternate method of selecting a proper race is to use
Gage Set J-9661-01, selecting a suitable feeler gage leaf until
the result is a 4 to 8 ounce pull on the scale between the
rear thrust bearing and upper (or outer rear) thrust race
(Fig. 44). If the pull is just less than 4 ounces, add .0005"
to the thickness of the feeler stock used to measure the
clearance. If the pull on the scale reads just over 8 ounces,
then subtract .0005" from the thickness of the feeler stock.
Select a race TW O (2) FULL SIZES LARGER than
feeler gage thickness
No. 9 or 090 race).
REAR BALL
2 1
corresponding to TW O (2) FULL SIZES LARGER
FEELER G A G E S
than Dial Indicator or feeler gage measurement of
the amount of end play shown.
.007", select a No. 9 or 090 race).
right-hand slot at bottom center of Parts Tray J-
9 40 2 .
Fifteen (15) thrust races are provided in increments of
.0005" (one-half thousandths) thickness and one Z ER O
gage thickness, providing a total of 16 sizes available for
field service. Thrust races are identified on the part by their
thickness in thousandths, in excess of the thickness of the
ZERO thrust race.
This "num ber" also corresponds to the last three digits
of the piece part number. See Thrust Race size Chart in Fig.
41.
discs are provided
M UST BE KEPT
Dial Indicator increments
(If feeler gage is .007", select a
Select a thrust race w ith a "number"
.
in .0005" (one-half
IN PROPER
are .001";
(If measurement is
Place thrust race in