- Label and disconnect the hoses from the valve. Carefully loosen and remove
the retaining bolts, remembering that they are probably heat–seized
and rusty. Use penetrating oil freely.
- Remove the valve and clean the gasket remains from both mating surfaces.
- Inspect the valve for any sign of carbon deposits or other cause of binding
or sticking. The valve must close and seal properly; the pintle area may be
cleaned with solvent to remove soot and carbon.
- After cleaning and inspection, recheck the motion of the valve with a hand
vacuum pump. Watch the shaft area closely. A stuck or binding valve will not
open properly; a weakened valve will open too soon. If either condition is
encountered, replace the valve.
To install:
- Install the valve with a new gasket. Tighten the bolts evenly to 5 ft. lbs.
(7 Nm).
- Connect the hoses and lines to their proper ports.
