Rattling Sound from EPS Gear Box – 2015-2021 Subaru

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NHTSA ID Number: 10164192

Manufacturer Communication Number: 04-17-17R

Summary

This bulletin provides a service procedure to address isolated customer concerns of a rattling sound identified as coming from the Electronic Power Steering (EPS) gear box (steering rack) assembly. The repair (when applicable) involves installation of a new tension spring for the worm gear to reduce / eliminate the condition. It should be noted the condition is NOT detrimental to the operation of the EPS system.

 

17 Affected Products

Vehicles

MAKE MODEL YEAR
SUBARU LEGACY 2015-2019
SUBARU OUTBACK 2015-2019
SUBARU WRX 2015-2021

 


INTRODUCTION:

This bulletin provides a service procedure to address isolated customer concerns of a rattling sound identified as coming from the Electronic Power Steering (EPS) gear box (steering rack) assembly.  The repair (when applicable) involves installation of a new tension spring for the worm gear to reduce / eliminate the condition.  It should be noted the condition is NOT detrimental to the operation of the EPS system.

 

PART INFORMATION:

Description Part Number
SPRING KIT NBL 34130AL010

 

SPECIAL TOOL INFORMATION:

A special tool bit is required to remove the cover screw for access to the tension spring.  An inch-pound torque wrench will also be necessary.  ONE tool will be provided to each Retailer AT NO CHARGE to coincide with this bulletin’s release.  Additional bits can be sourced (at user expense) from either Bosch or Matco.  Both tool suppliers will utilize the same BTP40P part number.

 

SERVICE PROCEDURE / INFORMATION:

Use the following flow chart when diagnosing a steering rattle sound concern on the applicable vehicles specified above:

TENSION SPRING REPLACEMENT PROCEDURE:

IMPORTANT NOTES:

  • This repair does NOT require the EPS gear box to be removed. (Photos below for reference only.)
  • Post-repair wheel alignment is NOT required or necessary.

 

Step 1-  Raise the vehicle and remove the undercover following the procedure in the applicable Service Manual.

 

Step 2-  Using the special tool bit, remove the tension spring cover screw.

                      

Step 3-  Remove the tension spring and replace with the new part.  Make sure the new spring is fully seated in the hole.

 

Step 4-  Make sure the cover screw hole is clean with no contamination before reinstallation.  Lubricate the o-ring with some ATF on your fingers then install the new tension spring cover screw / o-ring and torque to 40 inch-pounds.

 

Appendix A

EPS GEARBOX BACKLASH ADJUSTING PROCEDURE:

  • For Legacy and Outback: Gain access to the lock nut and adjusting screw by following the applicable Service Manual procedures for removing the following components:
    • Front under-cover
    • Front Stabilizer bar
    • Front exhaust pipe assembly
    • 5 bolts securing the TPS rack guard as shown.

For WRX: Remove the EPS gear box assembly following the procedure in the applicable Service Manual.  The remaining steps are the same as Legacy / Outback.

  • Use the special tools to loosen / remove the lock and adjusting nut (c), spring (b) and pressure pad (a).
  • Apply grease (p.n. SOA868V9700 / Autolex “A”) to the face and back side (red arrows) of the pad (a) and re-insert it into the housing.
  • Fill the inside of the adjusting nut (c) “cup” (red arrow) with the same grease (p.n. SOA868V9700 / Autolex “A”) and insert the spring into it.
  • Apply liquid gasket (red arrow): ThreeBond 1215 / SOA868V9700 to 1/3 or more of entire perimeter of adjusting screw thread (c).
  • Reinstall the adjusting screw and tighten to 20 N·m (14.8 ft-lbs.) and loosen it.
  • Tighten again to 20 Nm (14.8 ft-lbs) and loosen it.
  • Tighten a third time to 20 Nm (14.8 ft-lbs), then loosen it by 30 degrees, and reinstall the lock nut while holding the screw in position using the special tools.
  • While holding the adjusting screw, torque the lock nut to 45Nm (33.2 ft. lbs.).
  • On WRX, use the splined hole in the special tool (ST1 shown above) on the pinion splines to turn the EPS gear box and confirm smooth operation before re-installation. On Legacy / Outback, with the front wheels raised, turn the steering wheel to right and left, and perform the adjustment procedure again if the steering does not feel smooth.  If necessary, repeat the adjustment procedure by GRADUALLY loosening the adjusting nut as needed for smooth steering feel BUT, never exceed more than 40 degrees TOTAL.
  • If this backlash adjustment procedure is unsuccessful, the complete EPS gear box assembly will need to be replaced.
  • When EPS repair is complete, reassemble removed components in reverse order following the applicable Service Manual procedures INCLUDING replacement of any one-time use parts.

 



NUMBER: 04-17-17R
DATE: 09/13/17
REVISED: 08/20/19

https://www.nhtsa.gov/recalls?nhtsaId=10164192

https://static.nhtsa.gov/odi/tsbs/2019/MC-10164192-0001.pdf

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NUMBER: 04-17-17R
DATE: 09/13/17
REVISED: 05/02/19

https://www.nhtsa.gov/recalls?nhtsaId=10161811

https://static.nhtsa.gov/odi/tsbs/2019/MC-10161811-9999.pdf

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