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  1. BCjohnny

    Froude G4 dynamometer ...... again

    Been a while since I’ve posted here, and this might be a bit long, so apologies in advance …… I’m looking for specific information on the old Froude G4 hydraulic dynamometers, I’ve spent a fair amount of time researching this but it’s a bit of a desert out there So if you have your comments...
  2. BCjohnny

    Improvised Armature Growler

    I occasionally have a use for an armature growler, but not sufficient to actually purchase one. Assuming that they pretty much worked on the same principle (the armature sitting in the vee of an alternating current electo-magnet) I recently employed a portable Magnaflux yoke, mounted upside down...
  3. BCjohnny

    Audi TDI V6 2.5 Diesel Camshaft wear

    Is this just one of those engines that wears cams (as it would seem), or has something happened (lower volume/blocked oil feed to the heads/known secondary problem....) that needs fixing prior to replacing 4 camshafts and 24 finger followers? Haven't pulled the cams yet, but envisage re-using...
  4. BCjohnny

    Hydrovane compressor

    Sorry if this is in the wrong forum, but there doesn't appear to any specific one on air compressors. If it's not please feel free to direct me to the correct one. I need repair/rebuild/overhaul information on the "Hydrovane" (rotary vane) type compressors, specifically the 13/23/33 series. I...
  5. BCjohnny

    Electronic mains electricty meter possible faults UK.........

    Hope it is appropriate to post this here...... I'm trying to gather information as to possible faults, regarding the above, so I am better prepared for a looming problem. The meter is an Ampy Automation UK device, type 5196A, if that helps. Single phase 240v. According to the meter our...
  6. BCjohnny

    BS1407 "Silver Steel" tempering v sheer modulus

    I've got the hardening and tempering information I need regarding the above, but have been unable to find any info regarding hardness (thus tempering temp) versus sheer modulus. Is it wise to assume a linearity? I intend to harden and temper from different temps (probably just in the 180deg to...
  7. BCjohnny

    "Tar" external deposits Merecedes cyl head?

    Must admit not quite seen anything like it before. Mercedes Vito, fwd 4cyl common rail diesel. In the recess above the cam cover (and below the plastic "shield") where the solenoid injectors and breather/seperator sit, the whole lot full of tar. Not carbon or that spongey black goo you find in...
  8. BCjohnny

    Small scale Helical Broaching............

    One of the items I am about to make requires a part that has an internal Helical Spline. I have yet to determine the exact details of the spline but ballpark figures are 14.5mm Dia, 18 splines (approx 1mm depth), 30deg lead and the broached length about 35mm. The broaching, for various...

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