Chevrolet CHEVY VAN G10 SERIES Service Manual page 252

CLUTCHES & TRANSM ISSIONS 7-16
3. Bellows Comparison Check
Using a com parison gauge, as shown in Fig. 5. com pare the
load o f a know n good T urbo Hvdra-M alic 350 m odulator w ith
the assembly in question.
A. Install the m odulator that is know n to be acceptable on
either end o f the gauge.
B. Install the m odulator in question on the opposite end of
the gauge.
C. Holding the m odulators in a horizontal position, bring
them together under pressure until either m odulator
sleeve end just touches the line in the center o f the gauge.
The gap betw een the opposite m odulator sleeve end and
the gauge line should then be 1 /1 6 " or less. If the
distance is greater than this am o u n t, the m odulator in
question should be replaced.
Sleeve Alignment Check
Roll the main body o f the m odulator on a Hat surface and
observe the sleeve for concentricity to the can. If the sleeve is
concentric and the plunger is free, the m odulator is acceptable.
Once the m odulator assembly passes all o f the above tests, it
is an acceptable part and should be re-used.
C H E V Y V A N SH O P M A N U A L