Porsche 944 Power Steering Parts: A Complete Guide to Selection and Replacement

Power steering issues are common on the Porsche 944, especially as these cars age. Whether you're hearing a whine from the pump, feeling stiffness in the wheel, or noticing fluid leaks under the front end, knowing which parts to buy and how to choose them is essential. This guide covers the key power steering components for the 944, what to look for when replacing them, and how to make informed purchasing decisions.

Understanding the 944 Power Steering System

The Porsche 944 uses a hydraulic power steering system similar to many 1980s European cars. The system consists of a pump driven by the engine's accessory belt, a rack-and-pinion steering gear, hoses that carry fluid between components, and a reservoir. Over time, seals wear, hoses crack, and the pump can fail. The most common problems are leaks at the rack or pump, noisy operation, and reduced assist.

Key Components

• Power Steering Pump: Located on the front of the engine, driven by a multi-rib belt. It pressurizes fluid to assist steering. Failures often show as noise (whining or groaning) or fluid leakage from the shaft seal or body.
• Steering Rack: Mounted to the crossmember, it converts hydraulic pressure into mechanical force. Leaks typically occur at the pinion seal or end seals. A worn rack can also cause looseness or uneven steering effort.
• Hoses: High-pressure hose from pump to rack and low-pressure return hose. Age and heat make them brittle; leaks often appear at crimped fittings.
• Reservoir & Fluid: The reservoir is integrated with the pump on most 944s. Use only Dexron II or III automatic transmission fluid (ATF), not power steering fluid, as specified by Porsche.

Choosing Replacement Parts: OEM vs. Aftermarket

When buying power steering parts for your 944, you have three main options: Genuine Porsche (OEM), premium aftermarket brands, and budget alternatives. Each has trade-offs.

OEM Porsche Parts

Genuine parts are made to original specifications and offer the best fit and durability. They are expensive, especially for racks and pumps, but they eliminate guesswork. If you plan to keep the car long-term or are restoring to concours condition, OEM is the safest route. However, some OEM parts have been discontinued; you may need to source NOS (new old stock) or use aftermarket.

Premium Aftermarket Brands

Companies like ZF (the original manufacturer of many 944 steering components), TRW, Febi Bilstein, and SKF produce high-quality replacements that meet or exceed OEM specs. These are often cheaper than genuine Porsche parts and widely available. ZF is the most common brand for steering racks; their remanufactured units come with a warranty and are a solid choice. For pumps, Bosch and ZF are reliable. Hoses from Gates or ContiTech are good.

Budget Aftermarket Parts

Generic or no-name brands may save money upfront but often have poor seals, sloppy fit, or short lifespans. They can cause more problems than they solve. For critical safety items like steering, it's not worth the risk. Stick with reputable brands.

Reconditioned vs. New

Steering racks are often available as remanufactured units. These are core exchanges: you send in your old rack and receive a rebuilt one. Reputable rebuilders like ZF or Lares use new seals, bushings, and sometimes bearings. Reman is cost-effective and reliable if done correctly. New racks are rare and expensive. Pumps are also available reman (e.g., from Bosch) or new. Hoses should always be new.

What to Check Before Buying

Before ordering parts, diagnose the exact issue:

1. Check fluid level and condition. Low fluid or dark, burnt-smelling fluid indicates a leak or pump wear.
2. Inspect hoses for cracks or wetness. Common leak points are the high-pressure hose connection at the pump and the low-pressure hose at the rack.
3. Listen for noise. Whining when turning suggests pump cavitation (low fluid) or worn bearings. Groaning may mean air in the system.
4. Feel for stiffness or inconsistency. Uneven effort or binding points to a failing rack.
5. Look for leaks at the rack boots. Peeling back the rubber boot may reveal fluid — a sign of rack seal failure.

Once you've identified the faulty component, you can decide whether to replace just that part or do a full system overhaul. Many owners choose to replace the pump, hoses, and reservoir at the same time to avoid future problems.

Installation Tips

Replacing power steering parts on a 944 is a DIY-friendly job if you have basic mechanical skills. Here are practical pointers:

• Use correct fluid: Only Dexron III ATF. Never use brake fluid or generic power steering fluid.
• Bleed the system: After installation, turn the steering lock-to-lock with the engine off, then start the engine and repeat. This removes air bubbles.
• Torque fittings properly: Over-tightening can crack hoses or flare fittings. Use a flare nut wrench for high-pressure lines.
• Replace crush washers: Many hose connections use copper washers; replace them to prevent leaks.
• Align the rack: Preload the rack's centering spring correctly; the splined input shaft must align with the steering column U-joint.

If you're not comfortable, have a qualified Porsche mechanic do the work. Steering systems are safety-critical.

Common Parts Numbers and Interchange

Knowing correct part numbers helps avoid buying the wrong item. For example:

• Power steering pump: Early 944 (1983–85.5) use pump number 944.347.011.01; late models (1985.5–88) use 944.347.011.02. Some aftermarket pumps cover both.
• Steering rack: ZF rack part numbers vary by year; a common reman is ZF 8000.303.023 (for non-M030 cars). M030 (sport suspension) racks have different valving and are rare.
• High-pressure hose: Gates 364-510 or equivalent; make sure it matches your engine (2.5L or 2.7L/3.0L).

Always verify compatibility with your car's VIN and production date. Many online suppliers have fitment tools.

Where to Buy

Specialist Porsche parts retailers like Pelican Parts, 944 Online, and Sun Coast Porsche offer knowledgeable support. General auto parts stores may carry basic hoses but often have limited stock for 944-specific items. Avoid generic chain stores for racks and pumps — they frequently list wrong parts or low-quality remans.

Final Recommendation

For most 944 owners, a quality remanufactured steering rack from ZF or Lares, a new or reman Bosch pump, and new Gates hoses provide the best balance of reliability and cost. Replace the reservoir if it's leaking or the filter is clogged. Use only Dexron III fluid. If you need a genuine Porsche part, expect to pay 2–3 times more but gain peace of mind for fit and longevity. Avoid budget no-name parts. A few hundred dollars in quality parts now will save you from steering failure down the road.