Guest Posted March 6, 2015 Report Share Posted March 6, 2015 Hello. Having recently completed a CH replacement on my Mk2 Vitesse, I will be re-torqueing when it has 300 miles under its belt. The torque range for this car is between 65 & 70. I tightened the nuts to 66 to give a bit of flexibility on re-torque. As such is it worth slackening & tightening each nut in turn up to 70 OR as they are currently on 66 can I just increase the torque to 70 and then job done ?? Will be grateful for a steer on this. Thank you. Richard. PS: joined TSSC at Stonleigh, last weekend, - a job I have been meaning to do for years !! Link to comment Share on other sites More sharing options...
JohnD Posted March 6, 2015 Report Share Posted March 6, 2015 66lbs/ft? How long ago did you calibrate your torque wrench? Unless it was very recently, and you have a micrometer wrench so that you can set it so accurately, the actual tension will be no closer than 10% of that notional figure. At best! Micrometer wrenches cost! I calibrated my standard wrench recently, after bit of a problem and found it was under-reading by 30%! Calibration: You can buy a digital torque gauge, that fits between the wrench and the work, or set the gauge in a vice: http://www.ebay.co.uk/itm/3pc-Digital-Torque-Wrench-Adaptor-Set-Electronic-Digital-Display-1-4-3-8-1-2-/171668867943?pt=LH_DefaultDomain_3&hash=item27f8430b67 OR, send your wrench away to be calibrated: http://www.calibrate.co.uk/torque/?gclid=CjwKEAiAveWnBRCzjqf4zpuUkGYSJABcoZbHGpThCFmXQpboT_E4HA7vgj5VLWPTEOJfiBDmO5iZ1RoC1brw_wcB You will note from that site that even after calibration the toll cannot be better than 6% accurate. So your head could be anywhere between 62 and 73lbs/ft OR, do your own check. Clamp the wrenches drive shaft in a vice, so that the handle moves in a vertical plane. Measure a point on the handle, so that you can hang a known weight on it at a known distance. Say the handle gives you a point 18" (1.5ft) from the drive, and you can hang a known weight there, say 12 kgs (26lbs) (a 2L saloon flywheel). That's just under 40lbs.ft. Set the wrench to 40, hang oyur weight - does it click? Spot on! JOhn Link to comment Share on other sites More sharing options...
Steve C Posted March 6, 2015 Report Share Posted March 6, 2015 And at the risk of SBO, once you have re torqued the head, don't forget to check the valve clearances and re-set if needed. Steve C Link to comment Share on other sites More sharing options...
Darren Groves Posted March 6, 2015 Report Share Posted March 6, 2015 When you re-torque you should slacken each nut off slightly, don't start from its originally torqued position. Link to comment Share on other sites More sharing options...
Guest Posted March 9, 2015 Report Share Posted March 9, 2015 Hi. Darren - thanks for that, very useful. JohnD - micrometer wrench and thanks for flagging those points up. Much appreciated. Regards. Richard. Link to comment Share on other sites More sharing options...
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