Chevrolet 1980 Light Duty Truck Repair Manual page 161

F ig . 5 - 7 E ~ A c c u m u la t o r In s t a lla t io n
points w ith pow er
W h e n e v e r th e booster is disassem bled
and all disturbed seals and dam aged tube
inserts should be replaced. A ll of these
parts are included in a kit. If any of th e
acc u m u la to r valve
dam aged or lost, replace all th e valve
com ponents.
1. Clean all m etal parts in a suitable solvent. Be careful
to avoid losing sm all parts.
2. Inspect the valve spool and the valve spool bore in
the housing for corrosion, nicks, scoring or other damage.
D iscoloration o f the spool or bore, particularly in the
grooves, is not harmful and is no cause for replacement.
3. If the valve spool or the valve spool bore has nicks
or scoring that can be felt with a fingernail, particularly on
the lands, the entire booster should be replaced as an
steering fluid.
com ponents are
assembly.
N O TICE:
T he clearance between the spool valve and
the spool valve bore o f the housing assem bly is
important. Because o f this, the valve spool valve and
the housing assem bly m ake up a selective assembly.
The spool valve is selected to m atch the spool valve
bore.
4. Inspect the piston for scratches, nicks, etc. If
scratches on the outside diameter can be felt with a
fingernail, the input rod and piston m ust be replaced.
Assembly
1. Install tube seat with T ool J-6217 as show n in Figure
5-1 IE.
2. Install "O" ring and spool valve plug (fig. 5-9E).
3. Push spool valve plug in and install retaining ring.
4. Coat the piston bore and the piston seal with clean
power steering fluid, and assem ble the
Fig. 5-10E~Rem oving Tube Seat
BRAKES 5-25
N E W
seal in the
O V E R H A U L M A N U A L