Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Fig. 4 Spool valve inspection
1.
Clean all parts in a suitable solvent being careful to avoid losing small parts.
2.
Inspect valve spool and valve spool bore in booster housing for corrosion, nicks, scoring or other damage. Discoloration of the spool or bore,
particularly in the grooves, is not harmful.
3.
If the valve spool or the spool bore has nicks or scoring that can be felt with a fingernail, particularly on the hands, the spool and housing should
be replaced as an assembly, Fig. 4. The clearance between the valve spool and the spool bore of the housing is important. Because of this,
the spool and housing make are made as a selective assembly and therefore can only be replaced as an assembly.
4.
Inspect the input rod and piston assembly for corrosion, nicks, scoring or excessive wear. If the piston is damaged, the input rod and piston
assembly should be replaced.
5.
Inspect piston bore in booster housing for corrosion, nicks, scoring or other damage. If the bore is damaged, the valve spool and housing should be
replaced as an assembly.
Assembly
Fig. 7 Accumulator valves
Fig. 8 Installing input rod seals. 1980---84
