Opel 1900 1973 Service Manual page 583

(a) Using a feeler gage, select a leaf or combination
of leaves which result in satisfactory "feel" when
inserted between rear piston drive ball and wash
plate (see Figures 9B-141 and 9B-142).
SHAFT END PLAY
Figure 98-141 Checking Piston and Shaft End Play
Figure 98-142 Checking Clearance Between Rear
Piston Drive Ball and Swash
(b) Remove selected leaf or leaves from feeler gage
and attach end of spring scale that is calibrated in
ounces. (A generator brush spring scale (J-5 184) or
the spring scale for checking distributor point setting
may be used for this step).
(c) Reinsert feeler gage leaf or leaves between rear
piston drive ball and wash plate and draw leaf or
leaves out again, simultaneously measuring "drag"
on leaf or leaves (see Figure 9B-143). If correct leaf
(leaves) has been selected, spring :scale will read be-
tween 4 to 8 ounces pull (the higher reading is
desired). To perform this step correctly, feeler gage
leaf (leaves) must be withdrawn straight out with a
steady even motion, and all surfaces involved must
be coated with No. 525 viscosity oil. Record gage
dimension.
PISTON PLAY
Figure 98.143 Checking Drag on Selected Feeler
Use of the spring scale establishes a standard of
measurement of the amount of feeler gage leaf
"drag" required.
(d) Rotate the shaft and wash plate assembly 120
degrees and perform a second check (Steps "a, b and
c") between same piston drive ball and wash plate.
Record gage dimension.
(e) Rotate shaft and wash plate again approximately
120 degrees and repeat third check (Steps "a, b and
c") between same piston drive ball and wash plate.
Plate
Record gage dimension.
e") select minimum feeler gage reading and obtain
from stock (ref. to the Shoe Disc Table for part num-
ber of shoe disc) one shoe disc corresponding to the
minimum gage reading (ref. example below). Place
shoe disc in respective position on parts tray (J-
9402).
Gage Leaf with Spring Scale