NOS Porsche Type 4 Part 021.115.175 – What You Need to Know

If you're restoring a classic air-cooled Porsche, you've likely encountered part number 021.115.175. This is a New Old Stock (NOS) component for the Porsche Type 4 engine family. Understanding exactly what this part is, where it belongs, and how to use it can save you time, money, and frustration. Below we break down everything you need to know about NOS Porsche Type 4 part 021.115.175.

What Is NOS Porsche Type 4 Part 021.115.175?

Part number 021.115.175 is a genuine Porsche oil pump cover gasket. Specifically, it is the gasket that seals the oil pump cover to the engine case on Type 4 engines. These engines were used in the Porsche 914 (1970–1976), the Porsche 912E (1976), and the early 911 models with the 2.0L Type 4 engine (1969–1971). The part is made of a composite material designed to withstand high oil temperatures and pressures.

Key Specifications

• Material: Fiber-reinforced composite
• Thickness: Approximately 0.5 mm (varies slightly with NOS batches)
• Application: Oil pump cover to crankcase
• OEM number: 021.115.175
• Condition: New Old Stock – never installed, original factory packaging

Why Choose NOS for This Gasket?

A gasket is a simple part, but its quality matters. NOS 021.115.175 parts were manufactured to original Porsche tolerances. Modern aftermarket copies may use different materials or have slight dimensional variations. For a concours restoration or a high-performance rebuild, NOS ensures the correct fit and sealing properties. The downside is that rubber compounds can age even when stored; however, this specific gasket is not rubber but a more stable composite, so degradation is minimal if kept in a dry environment.

Common Applications

The 021.115.175 gasket is used on:

• Porsche 914 (all model years with 1.7L, 1.8L, and 2.0L engines)
• Porsche 912E (1976, 2.0L engine)
• Early 911T, E, and S with 2.0L Type 4 engine (1969–1971)
• Volkswagen Type 4 engines (used in some VW buses), though the part number differs in VW applications

Installation Tips

Replacing the oil pump cover gasket requires the following steps:

1. Drain the Engine Oil

Start with a warm engine to allow full drainage. Remove the drain plug and let the oil flow into a catch pan.

2. Remove the Oil Pump Cover

Typically four hex bolts hold the cover. Use a 10mm socket. Be careful not to lose the locating dowels.

3. Clean the Mating Surfaces

Use a plastic scraper to remove old gasket material. Avoid metal tools that can scratch the aluminum. Clean both the cover and the crankcase surface with brake cleaner.

4. Install the New NOS Gasket

Place the 021.115.175 gasket onto the pump cover alignment pins. Apply a thin bead of anaerobic sealant (recommended) to both sides of the gasket for an extra leak-proof seal, though the NOS gasket alone often works.

5. Torque the Cover Bolts

Tighten the bolts in a cross pattern to 7–9 ft-lbs. Do not overtighten.

6. Refill Oil and Check for Leaks

Refill with the correct oil grade and run the engine to operating temperature. Inspect for leaks.

Where to Source NOS 021.115.175

Finding NOS parts requires patience. Many specialty Porsche parts suppliers occasionally have old stock. Forums like the 914 World classifieds or Pelican Parts are good places to search. Always ask for photos of the actual part and its packaging. Counterfeit or relabeled gaskets exist, so verify the part number and condition.

Alternatives if NOS Is Unavailable

If you cannot find an NOS 021.115.175 gasket, consider:

• OEM replacement: Porsche still supplies some gaskets under different part numbers; check with a dealer.
• Aftermarket high-quality gaskets: Brands like Victor Reinz or Elring make reliable composite gaskets for Type 4 engines. They may differ slightly in thickness but usually work well.
• Paper gasket material: In an emergency, you can cut your own from quality gasket paper, but this is not recommended for long-term durability.

Is NOS Worth the Extra Cost?

For a daily driver or a track car, a new aftermarket gasket is perfectly fine. But for a point-judged restoration or an engine rebuild where originality matters, an NOS 021.115.175 gasket holds its value. The part is relatively inexpensive (usually $10–$30), so the cost difference is small. The peace of mind from using a genuine factory part often justifies the search.

Final Recommendation

If you are rebuilding a Type 4 engine and want to maintain authenticity, buy an NOS 021.115.175 gasket from a trusted source. Inspect the gasket before installation for any cracks or brittleness. Pair it with quality sealant for best results. If originality is not a concern, a quality aftermarket gasket from a known brand will serve you just as well. Whichever route you choose, ensure the mating surfaces are clean and the torque specs are followed. A small gasket can cause big leaks if neglected.