Oil Separator/PCV

Remove and replace the oil separator/PCV assembly on the 1992 Dodge Viper 8.0L V10 to restore proper crankcase ventilation and prevent oil consumption issues.

Warnings

Tools required

Parts

• Oil separator/PCV valve assembly × 1 — Mopar 4663546 or equivalent
• Oil separator gasket/O-ring × 1 — Use OEM specification
• PCV hoses (if damaged) × 1 — Inspect and replace as needed

Preparation

1. Park vehicle on level ground and allow engine to cool completely (minimum 2 hours after operation).
2. Disconnect negative battery cable to prevent accidental starter engagement.
3. Remove engine cover if equipped (some 1992 models have decorative covers).
4. Photograph or diagram the PCV hose routing from the oil separator to the intake manifold and valve covers for reference during reassembly.

Procedure

1. 1

   Access the oil separator assembly
   Locate the oil separator/PCV assembly in the crankcase ventilation circuit. Verify its exact mounting location and configuration against the factory service manual for the 1992 Viper 8.0L V10, as the layout is platform-specific. Clear any wiring harnesses or vacuum lines that may obstruct access by gently moving them aside without disconnecting unless necessary.
2. 2

   Disconnect PCV hoses from separator
   Using needle-nose pliers, compress the spring clamps on each hose connection to the oil separator. Note the number and routing of hose connections; verify against the factory service manual, and label each hose to its port during removal. Slide clamps back on hoses, then twist and pull hoses off the separator nipples. Note which hose connects to which port. Place shop towels beneath connections as some oil residue will drain out.
3. 3

   Remove separator mounting fasteners
   Remove the mounting bracket bolts securing the oil separator. Verify the exact bolt size and count against the factory service manual for the 1992 Viper 8.0L V10. Remove all mounting bolts and carefully note the position of any brackets or spacers. The separator may have oil residue underneath, so keep a catch pan positioned below.
4. 4

   Extract oil separator assembly
   Carefully lift the oil separator assembly up and away from the engine. If the separator has a lower connection to the valve cover (some configurations have a press-fit tube), gently twist while pulling upward to break the seal. Avoid forcing to prevent damage to the valve cover opening. Drain any remaining oil from the separator into your catch pan.
5. 5

   Inspect valve cover port and gasket surface
   Inspect the valve cover PCV port where the separator was seated. Remove the old gasket or O-ring completely using a flathead screwdriver if necessary. Clean the sealing surface with shop towels to remove all oil residue and old gasket material. Do not use abrasive materials that could scratch the sealing surface. Check for cracks or damage to the port.
6. 6

   Prepare new oil separator
   Remove the new oil separator from packaging and verify it matches the original configuration. Install the new gasket or O-ring onto the separator's mounting base, ensuring it seats properly in its groove. Lightly coat the gasket with clean engine oil to aid installation and create a better initial seal.
7. 7

   Install new oil separator assembly
   Position the new oil separator over the valve cover port, aligning the mounting holes with the bracket positions. If the separator has a lower tube that inserts into the valve cover, guide it carefully into the port while lowering the assembly. Ensure the gasket seats evenly without pinching.
8. 8

   Secure separator mounting fasteners
   Install the mounting bracket bolts and hand-tighten first to ensure proper alignment. Torque the mounting bolts in a cross-pattern to the factory-specified value from the 1992 Viper service manual to ensure even gasket compression and prevent leaks. Do not overtighten as this can crack the separator housing or distort the mounting flange.
9. 9

   Reconnect PCV hoses
   Reconnect the PCV hoses to the appropriate ports on the new oil separator, referencing your photographs or diagrams. Push each hose firmly onto its nipple until it bottoms out. Slide the spring clamps back into position approximately 1/2 inch from the end of each hose to secure the connection. Verify each hose is routed without kinks or sharp bends.
10. 10

    Verify installation and restore components
    Double-check all hose connections are secure and all mounting fasteners are tight. Reposition any wiring harnesses or vacuum lines that were moved during the procedure. Reinstall engine cover if equipped. Reconnect the negative battery cable.

Reassembly

1. Installation follows the reverse order of removal with attention to hose routing and clamp position.
2. Ensure all PCV hoses are connected to their correct ports as documented during disassembly.
3. Verify the oil separator mounting bolts are torqued evenly to prevent gasket leaks.

Verification

• Start the engine and allow it to idle for 2-3 minutes while monitoring for oil leaks around the separator mounting gasket.
• Check all hose connections for proper seating and listen for any vacuum leaks (hissing sounds).
• Rev the engine gently to 2000-2500 RPM and verify smooth idle return, indicating proper crankcase ventilation.
• After the first drive cycle, re-inspect the separator area for any oil seepage or loose connections.
• Monitor oil consumption over the next few hundred miles to verify the new separator is functioning correctly.

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