NISSAN 40606-44000 Kingpin Bearing Shim

This genuine Nissan (OEM: 40606-44000) kingpin bearing shim is a precision calibration component essential for the proper operation of the suspension and steering systems. The primary function of the shim is the precise adjustment of kingpin bearing axial play (clearance), ensuring factory-specified bearing preload.

Technical Features and Functions

Kingpin bearing shimming is critical on the front suspension of solid axle or four-wheel drive vehicles. Improper shimming directly affects vehicle stability and steering precision.

• Material: Premium-quality, wear-resistant precision spring steel with minimal compressibility, engineered to withstand continuous mechanical stress.
• Function: Micrometer-accurate clearance correction between kingpin bearings to achieve optimal bearing preload.
• Durability: Excellent corrosion resistance and dimensional stability for a long service life.
• OEM Quality: Genuine Nissan OEM part, guaranteeing perfect fitment and full compliance with factory specifications.

Symptoms of Improper Shimming or Wear

If shims become worn, deformed, or improperly adjusted, the following symptoms may occur:

• Steering wheel shake (shimmy): Particularly at higher speeds or when driving over road imperfections, wheels can become unstable due to improper preload.
• Vertical play: Noticeable vertical play or wobble when lifting the vehicle and checking the wheel.
• Premature bearing wear: Excessive preload (too tight) or excessive play (too loose) leads to rapid kingpin bearing failure.
• Uneven tire wear: Altered suspension geometry causes abnormal wear along the inner or outer edges of the tires.

During suspension overhaul and kingpin bearing replacement, checking clearance and using genuine Nissan shims is always recommended to ensure safe, stable road holding.