INSPECTION & SERVICE
Open System with Serviceable Ventilation Valve
- Remove the air cleaner.
- Pull the PCV valve out of the grommet on the valve cover.
- Remove the crankcase ventilating hose and clamp from the carburetor fitting, using a pair of hose-clamp pliers.
- Remove the other end of the hose and clamp from the PCV fitting, using the hose-clamp pliers.
- On six-cylinder models, remove the fitting from the carburetor. On V8 models, remove the 90° elbow from the PCV valve.
- Using a snapring retainer tool, remove the retaining ring from the end of the PCV valve assembly.
- Remove the retaining washer, valve, and spring.
- Soak all metal fittings and PCV valve parts in carburetor solvent.
- Remove all emission deposits by probing all fitting passages and valve orifices with an appropriate diameter drill or wire.
- Wash all metal parts in clean solvent and dry them with compressed air.
- Soak the rubber ventilation hose in a low-volatility petroleum-base solvent.
- Clean the rubber ventilation hose by passing a cloth through the hose with a wire or rod.
- Rewash the hose in clean carburetor solvent and dry with compressed air.
- Wash the oil filler cap in clean carburetor solvent. Shake the cap dry.
- Clean out the fitting at the carburetor with a 5 / 16 inch diameter drill.
- Inspect all parts for damage, wear, or deterioration. Replace if necessary.
- Place the spring in the valve body.
- Position the valve in the valve body with the pointed end toward the hose connection.
- Place the retaining washer in position.
- Install the retaining ring on the end of the PCV valve assembly.
- On six-cylinder models, install the fitting on the carburetor. On V8 models, attach the 90° elbow to the PCV valve.
- Using a pair of hose-clamp pliers, install the hose and clamp on the PCV valve.
- Attach the hose and clamp to the carburetor fitting.
- Insert the PCV valve into the rubber grommet on the valve cover.
- Install the air cleaner.
Open System (Non-Serviceable Ventilation Valve)
All 1965, 1966, and 1967 models sold outside California are equipped with positive crankcase ventilation systems with non-serviceable ventilation valves. These positive crankcase ventilation systems are of the open type, drawing ventilating air through the oil breather filler camp and discharging the crankcase vapors into the intake manifold. The ventilation valve is a single unit and cannot be cleaned. Therefore, it is imperative that the valve be replaced every 12 months or 12,000 miles, whichever occurs first. The procedure for removal, cleaning and inspection, and installation of the open system with the non-serviceable ventilation valve is the same as that of the serviceable valve system, except that all references to disassembly, cleaning, and assembly of the PCV valve should be deleted.
Closed System (Non-Serviceable Ventilation Valve)
Starting in 1965, California has required that all new cars sold in that state be equipped with closed crankcase ventilation systems. Federal law requires the closed system on all 1968 and later models. The closed ventilation system features a sealed breather cap which is connected to the air cleaner by a rubber hose. Thus, the crankcase receives air from the air cleaner, making the entire system sealed from the atmosphere. The recycling of the crankcase vapors places a severe load on the PCV valve, hoses, and fittings, making the 12 month, 12,000 mile service interval mandatory.REMOVAL & INSTALLATION
- Remove the oil filler cap and its connecting hose to the air cleaner.
- Remove the air cleaner (and duct and valve assembly if so equipped).
- Remove the hose from the ventilator valve in the valve cover. Remove the oil separator from the valve cover, if so equipped. Remove the other end of the hose from the intake manifold, or carburetor spacer connection, if so equipped. On models with a T fitting or hot idle compensator, disconnect it from the hose assembly.
- Pull the ventilator valve from the grommet in the valve cover. Discard the ventilator valve assembly. Do not clean this valve.
- Install in the reverse order of removal.