Sunday, October 27, 2013

How to Measure for Leaf Springs

Obtaining correct leaf spring measurements is vital to keep a suspension system functioning safely and correctly. Three measurements determine if a new leaf spring will mount on a vehicle without disrupting its axle location or cause problems with its ride. The straightforward approach of measuring the straight line distance between the mounting points of the spring seem like the correct approach, but more factors come into play that determine where to take the measurements.

Instructions

    1

    Lay a steel rule flat on top of the longest spring. Align the end of the steel rule with the center of the left side leaf spring mounting bracket. Push the steel rule towards the spring to bend it to the curvature of the spring. Read the measurement from the center of the mount to the center bolt holding the leaf spring pack together.

    2

    Switch the steel rule to the right side of the leaf spring. Repeat the ruler alignment and measuring procedure to determine the distance from the right side to the center mounting bolt.

    3

    Add the two measurements together to determine the overall length of the leaf spring.

    4

    Tie a string line to the left leaf spring mounting point. Pull the string line across the leaf spring. Tie the string line to the right spring mounting point. Adjust the string until both tied ends of line align with the center of the mounting points.

    5

    Push the zero end of the rule against the leaf spring at the center bolt. Read the point the string line intersects the rule to measure the spring arch.


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