1966 Porsche 912 Steering Parts: A Comprehensive Guide

When restoring or maintaining a 1966 Porsche 912, the steering system is a critical component that demands careful attention. The 912 shares its basic steering architecture with the early 911, but there are specific parts unique to the 912, especially for the 1966 model year. This guide covers the essential steering parts you may need, how to identify them, and what to consider when sourcing replacements.

Understanding the 1966 Porsche 912 Steering System

The 1966 912 uses a worm-and-sector steering box, similar to the early 911. However, the steering arms, tie rods, and other components differ slightly. The system is manual (no power steering), and the steering ratio is relatively quick for its era. Key components include:

• Steering box (worm and sector)
• Steering column with shaft
• Steering wheel (wood or plastic options)
• Pitman arm (drop arm)
• Drag link
• Tie rods (inner and outer)
• Steering knuckles
• Steering idler arm (on some late 1966 models)

Identifying the Correct Parts

For a 1966 912, chassis numbers range from 350001 to 353000 (coupe) and 450001 to 452000 (targa). Always verify your car's chassis number and component part numbers before ordering. Many parts are marked with Porsche part numbers or manufacturer stamps. Original parts often came from suppliers like ZF for the steering box and Hella for the steering column switches.

Common Steering Parts for 1966 Porsche 912

Steering Box

The steering box is central to the system. For 1966, the box is a ZF model 32/2 with a worm-and-sector design. Rebuilding is possible but requires specialized tools. Replacement units are available but can be expensive. If your box has excessive play or leaks, a rebuild kit or professional rebuild is often more cost-effective.

Rebuild Kits vs. New Steering Boxes

Rebuild kits include seals, bearings, and sometimes the sector shaft. A new replacement box from manufacturers like ZF or Bosch (if available) can cost over $2,000. Rebuilding by a specialist typically runs $800–$1,200. For most restorations, rebuilding the original box maintains originality.

Tie Rods

The 1966 912 uses two tie rods: an inner tie rod (connecting the drag link to the steering knuckle) and an outer tie rod (connecting the inner rod to the knuckle). They are not adjustable on the 912—adjustment is via the drag link. Replacement ends are available from brands like TRW, Moog, and Lemförder. Ensure you get the correct thread pitch (both metric).

Drag Link

The drag link connects the pitman arm to the idler arm. On the 1966 912, it has a left-hand thread on one end and right-hand on the other for toe adjustment. Replacement drag links are available from aftermarket suppliers. Check for wear at the ball joints—if they feel loose, replace the entire link.

Pitman Arm (Drop Arm)

The pitman arm connects the steering box to the drag link. It has a splined connection to the steering box and a tapered ball joint for the drag link. The pitman arm is often overlooked but can cause slop if the splines are worn. New arms are available from Porsche Classic or aftermarket sources.

Idler Arm

Some 1966 912s have a steering idler arm (mounted to the chassis on the passenger side). This supports the drag link and reduces steering vibration. The idler arm has a bushing that can wear. Replacement bushings are available; the arm itself is often still serviceable.

Steering Column Components

The steering column includes the shaft, universal joint (coupler), and bearings. The column shaft has a splined connection to the steering box. The universal joint (also called the steering coupler) is a rubber disc that can dry out and crack. Replace it if there is play or noise. The column bearings can also wear; they are available from Porsche parts suppliers.

Steering Wheel

The 1966 912 originally came with a wood-rimmed steering wheel (option) or a black plastic wheel. Both have a 420mm diameter. The wheel hub is splined to fit the column shaft. If replacing, ensure compatibility with the horn contact and turn signal cancel mechanism.

Steering System Maintenance and Tuning

Setting Steering Box Preload

Proper adjustment of the steering box preload reduces play without overtightening. The worm bearing preload is set by a shim at the top cover. The sector shaft mesh is adjusted via an eccentric screw or shims. This is a delicate procedure; if you are not experienced, have a professional do it.

Aligning the Steering

After replacing any steering components, a front-end alignment is necessary. The 1966 912 specs: toe-in 0–2mm, camber -0°30' ±15', caster 6° ±30'. Adjust toe using the drag link (do not adjust tie rods, as they are fixed length).

Sourcing 1966 Porsche 912 Steering Parts

OEM vs. Aftermarket

For originality, use OEM parts from Porsche Classic or NOS (New Old Stock) from specialty dealers. Aftermarket parts are often cheaper but may vary in quality. Brands like Stoddard, Pelican Parts, and Sierra Specialty Automotive offer reliable aftermarket options. For critical safety components like steering tie rods and the steering box, prioritize quality over price.

Part Numbers to Look For

• Steering box: 911.347.011.00 (for left-hand drive)
• Tie rod inner: 911.347.033.00
• Tie rod outer: 911.347.035.00
• Drag link: 912.347.041.00
• Pitman arm: 911.347.031.00
• Idler arm (if fitted): 911.347.047.00

Always cross-reference with your chassis number.

Where to Buy

Do not use general marketplaces. Instead, order from reputable Porsche parts specialists:

• Pelican Parts (online catalog with detailed information)
• Stoddard NLA (specializes in early 911 and 912 parts)
• Sierra Specialty Automotive (european car parts)
• Zim's Autotek (Porsche restoration parts)
• Performance Products (but verify fitment)

Also consider local Porsche clubs or forums like the 912 Registry and Early 911S Registry for used or NOS parts.

Final Recommendation

Restoring a 1966 Porsche 912's steering system requires a methodical approach. First, inspect the entire system for wear—especially the steering box, tie rods, and universal joint. If the box leaks or has excess play, have it rebuilt by a specialist using original parts. Replace all tie rod ends, the drag link, and the universal joint as a set to ensure consistent feel. Use high-quality aftermarket parts or OEM where possible. After assembly, get a professional alignment. This investment will transform the driving experience and maintain the car's value. If you are on a tight budget, prioritize the steering box and tie rods – they have the most effect on safety and handling.

Remember, the 912 steering system is nearly identical to the early 911, so many 911 parts fit, but always confirm compatibility for the 1966 model year. With careful parts selection and proper installation, your 912 will steer as precisely as when it left the factory.