Wednesday, 26 October 2011

Regreasing an EPS Honda Civic Steering Rack

EPS steering. Electric Power Steering. I admit never having heard of it before I met the Civic. Unlike conventional, reliable, relatively maintenance free power steering systems, or half conventional, half electric systems, EPS steering involves no pump, no hydraulic fluid, and no feel at all no assistance while the steering wheel is not being turned.

Instead, a torque sensor tells an electric motor to turn the wheels when the steering wheel is used. The idea is improved fuel economy, as the steering is not a constant drain on the engine's power.


Personally, I think Honda's EPS feels unnatural. From personal experience (before following excellent advice to spray a little lubricant in the torque sensor area), it can be notchy and reluctant to return to centre. At the time of writing, an innocuous google search for "honda civic eps" brings up more complaint than high praise - click the thumbnail to zoom in.

Photobucket

Poor lubrication can result in noise in the EPS rack when steering, stress on the electric motor, wear, and big headaches and bills. There are guides to replacing the rack once it's worn, but I'm not comfortable extracting the entire rack from the engine bay, or resetting electronics or tracking. I'd rather regrease the EPS in situ as much as possible while my steering is still fine, as a preventative measure.

© Copyright Colin Smith and
licensed for reuse under this Creative Commons Licence.

I'm not a mechanic. This post and those immediately following it are an account of how a dilettante regreased an EPS rack on a 2003 1.4l Civic, and shouldn't be taken as an authoritative guide. If you follow the same steps as me, I admit no liability for any damage done.









To give a short overview of what this involved, I lubricated as much of the rack sliding surface as possible by first pulling back the rubber accordion gaiters on either side of the EPS slider, and shoving grease in there. To get access to the rubber gaiters, I first removed the resonator box and airbox from the engine bay; to pull back the rubber gaiters, their steel retaining clips needed to be cut off.

Tools needed:

  • an 8mm socket (for removing the airbox).
  • a 10mm socket (for removing the resonator box and airbox).
  • socket set extender (for an awkwardly placed resonator box bolt).
  • axle stands (for raising the wheels off the ground; moving the steering wheel side to side helped with distributing the grease evenly).
  • a small set of cutters, to remove the original retaining clips (bellows bands).
  • a small crimping tool (to fit new bellows bands to the rubber gaiters).
Parts needed:
  • A new driver's side bellows band ("Band A"), Honda part number 53449S5AJ01.
  • A new passenger's side bellows band ("Band B"), Honda part number 53448S5AJ01. This has a larger diameter than the driver's side. £8 for the pair at a dealership; why so expensive? More on these bands below.
  • General purpose grease, despite the rubber gaiters. Honda make a dedicated power steering grease - part number 08C35-B0534L - but the shop manual specifies normal multipurpose grease during overhaul of the EPS rack:


I found it a great help to have the front wheels off the ground, so that they could be easily steered with the engine off:



Attempt nothing without gloves!



I've never come across these "bellows bands" before. Judging by the old ones, after fitting, the only way to remove them is to cut them off, so they are single-use. The raised area seems designed to prevent you cutting into the rubber gaiter by accident. When fitting the new bellows bands, I crimped the raised area in the same fashion as the old ones had been; this tightens the band securely.

In the photo below, the tabs circled in green slot into the holes circled in red. Then the raised area, circled in blue, is crimped tight. To later remove, the raised area is cut, releasing the band.


Photobucket



Following this introduction,I've split the EPS regrease photographs into stages:

  1. Removing the resonator box (only four 10mm bolts to unscrew)
  2. Removing the airbox (only two captive 10mm bolts to loosen, a hidden 8mm bolt to loosen, and an electrical socket to unplug)
  3. Regreasing the rack sliding surfaces at either side of the EPS slider guide
  4. Reassembly.

See you in the next one, have a good time.

    8 comments:

    1. Thanks for the article. The clips are re-useable, however you need a special tool which is not too expensive. The clip type does have a name, but I can't think of it right now. However with the correct tool they're really easy to get on and off.

      ReplyDelete
    2. I too have this problem on my 2003 civic. I have tried replacing the left hand side bush (opposite side of the electric motor) with a Teflon machines bush. It was OK for about 6 months then it came back again. But not as bad as it used to.

      ReplyDelete
      Replies
      1. Thank you very much for your comment. This is highly interesting. Any further details? Was this possible with the rack in place, or did you remove it from the car first?

        Delete
    3. Thank you very mutch. I have a silent and soft steering wheel afther greasing. Before the greasing i had a very pesky creak noise. Thank again.

      ReplyDelete
      Replies
      1. I need to change my slider bushing can this same process function as a guideline as to doing this?

        Contact: smahabir2802@gmail.com

        Delete
      2. I need to change my slider bushing can this same process function as a guideline as to doing this?

        Contact: smahabir2802@gmail.com

        Delete
    4. Hi. Is there a possibility you can repair the links to the photos, please? Looks a really helpful article. Thank you.

      ReplyDelete

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