Product Description
Coil Spring 31336767366
This component (OE 31336767366 / 31336767367) is a front coil spring. It is a key part of the front suspension, supporting the vehicle's weight and absorbing road shocks. Over time, coil springs can sag or break, leading to a lower ride height, poor handling, and a harsh ride. Replacing this coil spring restores the vehicle's ride quality and handling.
Key Features
Direct OEM Replacement: Manufactured to BMW's original equipment specifications for a precise fit and factory performance.
Optimized Spring Rate: Engineered with a coil spring design featuring an inconstant wire diameter, providing a progressive spring rate for optimal balance of comfort and handling.
Precision Dimensions: With an outer diameter of 146-149 mm and length of 355-365 mm, it is manufactured to BMW's exacting standards.
High-Strength Construction: Constructed from high-strength steel with a wire thickness of 12 mm to withstand the demands of BMW's sporty chassis.
Corrosion-Resistant Coating: Features a durable coating to protect against rust and extend service life.
Technical Specifications
|
Specification |
Details |
|
OE Numbers |
31336767366, 31336767367 |
|
Product Type |
Coil Spring |
|
Position |
Front Axle |
|
Function |
Supports vehicle weight, absorbs shocks |
|
Fits Models |
BMW 3 Series (E90/E91 etc.) |
Structural Composition
Spring Wire: 54SiCr6 high-silicon spring steel with a tensile strength of 2,050 MPa.
Variable Geometry: Wire diameter ranges from 11.5 mm (top) to 13.0 mm (bottom); coil count: 6.5 active coils.
End Finish: Hot-ground top and bottom ends with a CNC-controlled tolerance of ±0.3° to ensure perpendicularity.
Coating System: Zinc-phosphate base (20 μm) + textured black powder top coat (80 μm) with chip-resistant properties.
Compatible Vehicle Models
|
Make |
Model |
Years |
|
BMW |
3 Series (E90, E91, etc.) |
Various |
Installation and Usage Notes
-
Critical Orientation: This spring is directional. The tighter-wound coils (thinner wire) must face upward toward the strut mount. Installing it upside down reverses the spring rate progression, leading to harsh ride and bottoming.
Front-strut disassembly requires a high-quality dual-claw spring compressor. Always use compressors on opposite sides of the spring to prevent off-axis force ejection.
-
Before removing the old spring, mark the position of the lower spring perch relative to the strut body using a scribe line. Align the new spring to the same index to preserve factory caster settings.
-
Use new upper and lower spring pads (BMW part numbers 31336763469 and 31336763470) when replacing the springs-the rubber pads degrade over time and affect ride height.
-
Tighten the center strut nut to 65 N·m while the spring is fully compressed, then release the compressor slowly and evenly (half-turn alternation) to avoid sudden spring expansion.
FAQ
Q: What vehicles are this coil spring compatible with?
A: OE 31336767366 / 31336767367 is for BMW 3 Series models.
Q: Does this coil spring come as a pair?
A: Coil springs are often sold individually, but they should be replaced in pairs (both left and right) to maintain balanced suspension.
Q: What is the expected lifespan of this coil spring?
A: Lifespan varies depending on driving conditions and road quality. Regular inspection during routine maintenance is recommended.
Q: How do I know if my coil spring needs replacement?
A: Common symptoms include: a sagging front end, bottoming out over bumps, a rough ride, and visible damage to the spring.
Q: Do I need a wheel alignment after installation?
A: Yes, a professional wheel alignment is mandatory after replacing any coil spring.
Packaging and Shipping Module
Product Packaging
Each control arm is carefully packaged to ensure its arrival intact:
Protective Packaging: The control arm is first wrapped in a moisture-proof bag to prevent corrosion during storage and transportation. This protects the metal surface from moisture and humidity.
Foam Lining: This foam acts as a shock absorber, cushioning the control arm from impacts and vibrations during transportation.
Sturdy Carton: The control arm is placed in a high-quality corrugated carton, with foam padding filling the gaps to ensure a tight fit and prevent movement within the packaging.
Carton Labeling: Each carton is labeled with the product's original manufacturer's number, barcode, and basic product information for easy identification.
Shipping Information
International Shipping: We ship worldwide through experienced and reliable freight companies specializing in automotive parts. International shipping times vary depending on the destination and the chosen mode of transport.
Bulk Orders: For wholesale or bulk orders, we offer pallet shipping options. We can calculate the approximate number of control arms that a standard 20ft, 40ft container, or 40ft high cube (40HQ) container can accommodate, thus optimizing shipping costs.
Shipping Insurance: We recommend purchasing shipping insurance for all orders to protect goods from loss or damage during transit.
Receiving and Inspecting Goods: Please inspect the package immediately upon receipt. If there is any damage to the outer packaging, please take photos before opening and contact us immediately.
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