1977 Porsche 911 Hub Parts: What You Need to Know

The 1977 Porsche 911 is a classic that demands precise maintenance, especially when it comes to the wheel hub assembly. The hub parts on this air-cooled icon are critical for safe handling and longevity. Whether you're restoring a 911S or keeping a Carrera 3.0 on the road, understanding the hub components and how to source them correctly will save you time and frustration. This guide covers the essential hub parts for a 1977 911, what to look for when buying, and practical advice for installation.

Understanding the Hub Assembly on a 1977 Porsche 911

The front and rear hub assemblies on a 1977 911 are similar in design but differ in specifics. Each hub houses a set of tapered roller bearings, a grease seal, and the wheel bearing races pressed into the hub. The hub itself is a cast or forged piece that mounts the brake rotor and wheel. Proper bearing preload and seal integrity are vital to prevent play and grease leaks.

Front Hub Components

• Hub body: The front hub on a 1977 911 (part number 911.341.231.00 for left, 911.341.232.00 for right) is made of cast iron. It accepts the inner and outer wheel bearings.
• Inner bearing: Typically a 30305 or equivalent (SKF VKN 1505).
• Outer bearing: Often a 30304 or similar (SKF VKN 1504).
• Grease seal: A double-lip seal (e.g., 901.341.143.00).
• Dust cap: Press-fit metal cap covering the outer bearing.

Rear Hub Components

• Hub body: The rear hub is integrated with the half-shaft flange on early 911s, but by 1977, the rear wheel bearing housing is part of the trailing arm or semi-trailing arm assembly. The bearings (inner and outer) are pressed into the housing.
• Bearings: Often use SKF 6306 2RS or equivalent for the outer, and a separate inner bearing.
• Seals: Large-diameter grease seals are critical to prevent leakage from the differential side.

Common Hub Parts for the 1977 911

When servicing the hubs, you typically need the following parts:

• Wheel bearing kits: Available as complete sets (inner bearing, outer bearing, seal, sometimes with races). Brands like SKF, Timken, and FAG are reliable.
• Hub assembly: For the front, replacement hubs are available from Porsche Classic or aftermarket suppliers like Pelican Parts. Ensure the hub matches the brake rotor configuration (vented vs. solid rotors).
• Grease seals: Always replace seals when doing bearings. Use correct part numbers for the 1977 model year.
• Dust caps: Often overlooked, but missing or damaged caps let dirt in.
• Spindle nuts and washers: For the front, the castle nut and cotter pin must be replaced if worn.

OEM vs. Aftermarket Hub Parts

OEM Porsche Parts

• Pros: Perfect fit, matched to factory specifications, includes Porsche stamping.
• Cons: Higher cost, sometimes backordered for older models.
• Best for: Concours restorations or owners who want absolute originality.

Aftermarket Parts

• Pros: Lower price, widely available, often improved materials (e.g., sealed bearings).
• Cons: Need to verify compatibility; some low-cost bearings may fail prematurely.
• Best for: Daily drivers or track cars where performance trumps originality.

For the 1977 911, most aftermarket wheel bearings from SKF, Timken, or FAG match OEM specs. If you are not doing a concours restoration, aftermarket is a smart choice.

How to Identify the Correct Hub Parts for Your 1977 911

Before buying any hub parts, confirm your car's specifics:

1. VIN: The 1977 model year includes both narrow body and wide body (Turbo) variants. Turbo rear hubs are different.
2. Brake type: Check if your car has standard (solid) rotors or optional vented rotors. The hub flange thickness varies.
3. Production date: Late-1977 cars may have slight design changes. Check parts diagrams online using your VIN.
4. Bearing part numbers: Remove old bearings and read the numbers stamped on them. Cross-reference to current equivalents.

Use reputable sources like Porsche parts catalogs, Pelican Parts, or Suncoast Porsche to verify fitment.

Where to Find Reliable Hub Parts

• Specialty Porsche parts retailers: Pelican Parts, ECS Tuning, FCP Euro, and Stoddard are reliable. They stock OEM and aftermarket parts and provide fitment guidance.
• Porsche dealers: For OEM parts, your local dealer can order Porsche Classic parts. Lead times may be long.
• Automotive bearing suppliers: For bearings alone, NAPA, O'Reilly, or online bearing houses (e.g., Motion Industries) can cross-reference part numbers.

Avoid generic online marketplaces if you are not sure of the seller's reputation. Stick with known Porsche specialists.

Installation Considerations

Installing hub parts on a 1977 911 requires typical mechanical skills:

• Tools: Large bearing press, torque wrench, dial indicator for end play, and a hub puller (for front hub removal).
• Bearing preload: Front bearings must be set with a spring scale. Too tight leads to overheating; too loose causes wobble.
• Seal installation: Use a seal driver to avoid damaging the lip. Apply a thin coat of grease to the seal edge.
• Torque specs: Front spindle nut torque is around 150-180 ft-lbs, with a cotter pin. Consult a factory manual.

If you are not experienced, have a professional Porsche mechanic do the job. Improper bearing adjustment can cause wheel separation.

Final Recommendation

For a 1977 Porsche 911, start by identifying your exact hub parts using VIN and visual inspection. Purchase a high-quality bearing kit from a trusted aftermarket brand like SKF or Timken, and get OEM seals from a Porsche parts supplier. If you need a new hub body, go with Porsche Classic for guaranteed fit. Avoid cheap unbranded bearings. With proper installation, your 911 will deliver many more miles of driving pleasure.