URO Systems, LLC

URO Systems, LLC Shackle and Suspension Systems

A Proven High Performance Innovative Product with Superior Quality and Reliability

Technical Service Bulletin...

DATE: June 1997

Subject: Rear Suspensions

To: All ® Suspension Bushing Kit Installers

Re: Wear Limits for Rear Suspension Torque Leaf Bushings on all vehicles with Variable Rate Suspensions

DESCRIPTION

The following procedures should be used to determine when Variable Rate rear suspension torque leaf bushing service is required.

NOTE: The following bushing wear should be made prior to lubrication, however,

®Suspension Bushings require no lubrication.

1. Insert a 15" bar between the spring hanger rebound pin and the torque leaf spring eye. Observe the movement of the torque leaf spring eye while pushing up and down on the outer end of the bar. If the movement of the torque leaf spring eye at the spring pin is greater than .1255 inch, proceed to step two. It should be noted that a bar of greater than 15" in length could exert undue force causing the spring, spring hanger and or spring pin to be deformed or unnecessarily show signs of premature service life.

2. The only accurate measurement of bushing wear requires removing the spring pin from the torque leaf, measuring the outside diameter of the spring pin and the inside diameter of the spring eye bushing. The difference between the two measurements is the amount of clearance between the spring eye bushing and the spring pin. If a measurement of .007 to .012 is noted, the bushing is new. A measurement of .080 to .090 indicates that the bushing will require replacement during the next vehicle service interval; if the measurement is .120 or greater, the bushing should be replaced immediately.