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    1. · Registered
      1998 SL500
      Joined
      ·
      1,434 Posts
      This is neither here nor there, but in reassembling the pump on the engine, I learned the hard way that my cheap and seldom-used torque wrench may be on the fritz. I was thinking, hmm, I've been turning this wrench for kind of a long time...and then the upper left-hand bolt broke in half. See photos (in the first one, there's supposed to be a bolt head sticking out of that hole behind the belt). I should have the stub drilled out ASAP and get a replacement bolt (and torque wrench), correct?

      P.S. As you can see, I put the pulley and belt back on anyway, and when I started it up, all systems seemed to be go. I'll optimistically consider it a job mostly done.
      HF has a great electronic strain gauge based digital torque adapter, intended for using any 1/2" drive setup as a torque wrench--however after dead weight testing and finding it to be very accurate (withn ∓0.5%) I now keep it as my "in-house" calibration standard. I clamp it in a vise (using cheap 1/2" to 3/4" adapter in the vise) and use it to check (and calibrate if needed) my wrenches periodically and before any critical application.

      Click here for more about my evaluation of the unit.

      Here ot is - HF 1/2" drive digital torque adapter:

       
    1. · Registered
      1993 300SL
      Joined
      ·
      33 Posts
      Discussion Starter · #1 · (Edited)
      Replaced tires on 2009 CLK350 and was dismayed by how the prior shop [over]torqued the nuts (discovered trying to put mini-spare on after AAA trailered it home late at night) (http://www.benzworld.org/forums/w209-clk-class/2085346-ok-use-anti-seize-lug-nuts.html). Being more the cycling mechanic than working on cars (like in the old days), I found my 1/2" clicker torque wrench croaked from corrosion or something. So I knew I wouldn't be able to check shop torque values without buying a new torque wrench.

      I found a review of a Pittsburg Pro torque adapter that actually tested it (and some others) with lab equipment and found it awesomely accurate. I bought one through Harbor Freight for cheap (~$40 including tax and shipping).
      http://www.harborfreight.com/digital-torue-adapter-68283.html
      Totally excellent and highly recommended.

      A link to a video of how it works is here:
      https://www-1.compliance2product.co...tumjN4ueGvF2Uqsz9lnpFXhlKZNWQCSaH6n4TmOpXOqMQ
      Contrary to the reviews, it works just like you'd think. Turn it on, use it, turn it off. It stores torque values in memory, but by the time I ever remembered how to retrieve, it's easily reset with the +/- keys. Also neat was that when you press a +/- key to set the torque, it starts at 100 Nm, so you're never far from the desired value.

      A photo of what comes in the box (and how i cut a little hole in the foam and shaved the egg crates a bit to take pressure off unit... and even how I folded the instructions and calibration paper). I included this because some of the reviews are silly in their complaining about trivial things fixed in a minute. (And yes, I have a killer 17 mm, 6-point impact socket for this... I love buying good tools...)

      Summary: Very satisfying to use. Easily put in a vise to compare to a beam wrench or clicker. Beats any clicker hands down.
       

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    1. · Registered
      1998 SL500
      Joined
      ·
      1,434 Posts
      Cool,

      As you mentioned Harbor Freight, you may want to consider this tool sold by HF to check/calibrate your torque wrenches . They bill it as a digital torque adapter, however I use it as an intermediate torque standard, having checked and verified it's calibration with dead weights.



      Using a 1/2 female/3/4" male adapter clamped in a bench vise I use it to calibrate my "clickers" and check the wrench settings when torquing critical fasteners.

      I have found it the be very accurate and repeatable, here is a review I posted on my blog a while back...
       
    1. · Premium Member
      '72 350SL, '85 300D, '98 E320, '19 Subaru Outback (sold '14 GLK250)
      Joined
      ·
      14,011 Posts
      I have noticed electronic torque adapters being advertised recently . They apparently will turn any socket wrench into a torque wrench. Anyone tried those?
       
    2. · Premium Member
      '72 350SL, '85 300D, '98 E320, '19 Subaru Outback (sold '14 GLK250)
      Joined
      ·
      14,011 Posts
      The reviews at HF are a mix, but still slightly positive. Dead battery seems main complaint. Another is that it doesn't work at low torques.

      One idea that comes out of those reviews, is that it could be used to double check click type torque wrenches.

      Digital Torque Adapter

      Looks like vendors like Amazon and car part vendors no longer have this unit, possibly because HF does and is selling it a low price? Maybe that is why they are bad mouthing it?

      Princess Auto in Canada has a similar unit for C$25.00:

      Digital Torque Adaptor | Princess Auto
       

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