OER P18502N Power Steering Gear Box

( Brand: Oer ), ( Manufacturer Part Number: P18502N ), ( Type: Steering Gear )

Review OER Quick Ratio Power Steering Gear Box fits 1965-76

The **Oerlikon P18502N (1965 1976) Power Steering Gear Box** is a meticulously engineered component designed to deliver precise and responsive steering control for classic vehicles from the mid-1960s through the mid-1970s, including iconic models from manufacturers like Mercedes-Benz, BMW, and other luxury and performance-oriented automobiles of the era. This gearbox represents the pinnacle of hydraulic power steering innovation during its time, featuring a robust recirculating ball mechanism that ensures smooth, low-effort steering while maintaining exceptional durability. Crafted from high-grade materials, including hardened steel components and precision-machined gears, the P18502N is built to withstand the demands of daily driving, offering reliable performance even under heavy loads or at high speeds. Its compact yet sturdy design integrates seamlessly with the vehicle s steering column and linkage, providing a direct and immediate transfer of hydraulic pressure to assist the driver s input, reducing fatigue during long drives or urban maneuvering.

At the heart of this gearbox lies a sophisticated hydraulic system, typically powered by a dedicated power steering pump (often belt-driven from the engine), which generates the necessary fluid pressure to amplify the steering effort. The recirculating ball mechanism within the gearbox converts linear motion from the steering wheel into rotational force at the pitman arm, while the hydraulic assist compensates for resistance from the vehicle s front wheels, tires, and suspension. This design not only enhances comfort but also improves handling stability, making it a sought-after upgrade or replacement for enthusiasts restoring or maintaining vehicles from this era. The P18502N is particularly renowned for its compatibility with Mercedes-Benz models such as the 280SE, 300SE, and 450SE series, as well as BMW s 2002, 520i, and 630CSi, among others, where it serves as a critical link between driver intent and vehicle response.

Beyond its functional excellence, the Oerlikon P18502N is also a testament to the engineering prowess of its time, embodying the balance between performance and refinement that defined automotive design in the 1960s and early 1970s. Its robust construction, combined with the precision of its internal components, ensures minimal play and maximum efficiency, contributing to the vehicle s overall driving dynamics. Whether used in a meticulously restored classic or as a direct replacement for a worn-out original unit, this gearbox delivers the kind of performance that drivers of the era relied on smooth, predictable, and effortless. For collectors, restorers, and enthusiasts, the P18502N is not merely a functional part but a piece of automotive history, embodying the spirit of innovation and craftsmanship that defined an era of automotive excellence.

### **Pros and Cons of Buying a Used Oer P18502N (1965 1976 Power Steering Gear Box)**

1. **Compatibility and Reliability** The Oer P18502N is a well-known and widely used power steering gearbox for older European vehicles, particularly Mercedes-Benz models from the 1960s and 1970s. Its design is robust and has been proven over decades of use, making it a trusted component for classic car restorations and maintenance.

2. **Availability of Parts and Support** Due to its age and popularity, replacement parts (such as seals, bearings, and hoses) are still available through specialty suppliers, eBay, or classic car forums. This makes repairs and maintenance more manageable compared to rare or discontinued components.

3. **Cost-Effectiveness** Purchasing a used gearbox is significantly cheaper than buying a new or remanufactured one. For classic car owners on a budget, this can be a practical solution without sacrificing performance.

4. **Functional if Well-Maintained** If the gearbox has been properly serviced (e.g., fresh fluid, intact seals, and no internal wear), it can provide reliable power steering for years. Many examples still function well in lightly used vehicles.

5. **Easier to Source Than New** New OEM gearboxes for these older models are extremely rare and expensive. A used unit offers a practical alternative without requiring a full rebuild of the steering system.

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1. **Potential Wear and Tear** A used gearbox may have internal wear, such as worn bearings, leaking seals, or damaged teeth on the rack. Without a thorough inspection or rebuild, it could fail prematurely, leading to costly repairs.

2. **Lack of Warranty or Guarantee** Buying used means no manufacturer or seller warranty. If the gearbox fails shortly after purchase, you ll be responsible for the cost of replacement or repair.

3. **Hidden Damage Risks** Without a professional inspection, issues like internal corrosion, cracked housings, or contaminated fluid may not be immediately visible. These problems can lead to sudden failure or reduced lifespan.

4. **Fluid Condition Matters** Power steering fluid degrades over time, and if it hasn t been changed regularly, it can cause sludge buildup, increased friction, and accelerated wear. A used gearbox may require a full fluid flush and filter replacement.

5. **Installation Challenges** If the gearbox has been removed from a vehicle for an extended period, some components (like seals or mounting points) may dry out or degrade. Proper installation requires attention to alignment, torque specifications, and fluid bleeding to avoid leaks or binding.

6. **Limited Longevity Compared to New** Even if the gearbox is in good condition, its remaining lifespan may be shorter than a new or rebuilt unit. Classic cars often sit unused for long periods, accelerating wear on stored components.

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Buying a used Oer P18502N gearbox can be a cost-effective solution for restoring or maintaining a classic Mercedes-Benz or similar vehicle, provided you approach the purchase with caution. The key to success lies in **thorough inspection, testing, and maintenance** before and after installation. If you re comfortable with mechanical work or have access to a trusted mechanic, a well-chosen used unit can save money without sacrificing performance. However, if you prioritize reliability and longevity, investing in a rebuilt or remanufactured gearbox (if available) may be worth the higher cost.

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1. **Inspect Thoroughly** Before purchasing, check for leaks, smooth operation, and proper fluid condition. If possible, have a mechanic test the gearbox under load (e.g., by attaching it to a steering column and turning the wheel while pressurized).

2. **Source from Trusted Sellers** Buy from reputable classic car parts dealers, auction houses with return policies, or individuals with verifiable maintenance records. Avoid "as-is" purchases without any inspection.

3. **Rebuild or Rebuild-Ready** If the gearbox is worn but structurally sound, consider having it professionally rebuilt. This ensures all seals, bearings, and internal components are replaced, extending its lifespan significantly.

4. **Budget for Maintenance** Account for the cost of fluid changes, seals, and potential minor repairs. A used gearbox is a good short-term fix but may require ongoing upkeep.

5. **Alternative Options** If budget allows, explore remanufactured or aftermarket gearboxes (e.g., from companies like **Mercedes-Benz Classic Parts** or **Specialty Auto Parts**) that offer warranties and guaranteed performance.

Ultimately, the decision depends on your budget, mechanical comfort level, and how critical the gearbox is to your vehicle s operation. For high-mileage or daily-driven classics, a rebuilt unit is the safest choice; for project cars or occasional use, a carefully selected used gearbox can be a practical compromise.

Details:

Specifications: 7/16 female inverted flare pressure port 3/8 return 13/16 input shaft 2.5-3 turns lock. This part is new in the box and has not been used. Every box 100% tested for leaks, function, and performance. This steering box contains no remanufactured parts.

But is an open box Item. OER P18502N Features:: Replace a non working or worn out gear box with this quality reproduction power steering. It features an all new main casting, sector shaft, and internals.

part #: p18502n prices

• $73.99-$425.99

specifications steragebo:

• for years: 1965-76
• brand: Oer
• mpn: P18502n
• type: Steering Gear

seller steragebo:

• city: Portland, Oregon
• rating: 100.0%
• # reviews: 733

offer steragebo:

• best offers: True
• quantity: 1
• sold: 0
• availability: In Stock
• options: Ship-to-home
• started: April 7, 2026

returns steragebo:

• policy: No Returns

shipping steragebo:

• class: Economy
• type: Fixed
• service: Economy
• transit: 8-18 Days
• cost: $0.00

general steragebo:

• Car Truck Parts Accessories > Steering Suspension > Gearboxes, Rack Pinions
• condition: Used

payments steragebo:

• other
• credit card: Discover
• wallet: Apple-pay