This had me curious as well, so I found a few different explanations... "This method, also known as turn of the nut method, was introduced for manual assembly shortly after the second World War when a certain tightening angle was specified. The method has been applied for use with power wrenches, the bolt being tightened to a predetermined angle beyond the elastic range and results in a small variation in the preload due, in part, to the yield stress tolerance. The main disadvantages of this method lie in the necessity for precise, and, if possible, experimental determination of the angle; also the fastener can only sustain a limited number of re-applications before it fails." http://www.boltscience.com/pages/tighten.htm "Sometimes when using old head bolts, and when using metal to aluminum composite heads, etc., automotive manuals call for torque angle. This simply means that after correctly torquing the head bolts to 85 ft. lbs. (in your case), turn the bolt another one eighth of a turn, as in 360 degrees would be a complete circle. With today's more precise engineering practices, measurements in automotive components have become more critical. Exact clearance and torque specifications must be followed, otherwise, expensive automotive components will rapidly turn into scrap metal." http://www.geocities.com/Athens/Olympus/8947/QA13.htm The above example is not YOUR case, it is in the case of the person asking the question on that page. Greg -----Original Message----- From: Travis Goodwin [mailto:tgoodwin@xxxxxxxxxxxx] Sent: Tuesday, July 22, 2003 10:47 AM To: 'DMCForum@xxxxxxxxxxxxxxx' Subject: RE: [DMCForum] Angle Torque... what the hell? Of course I don't. That's why I'm asking! It is angle torque. I'm looking at the manual for installing the head bolts on the B28F. It says, and I quote: Angle torque cylinder head bolts 1. loosen all bolts in sequence 2. tighten all bolts 15-20 Nm in sequence 3. angle torque 113-117 degrees in sequence. Use protractor 5098. Use rocker arm shaft as a line of reference when torquing. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem <http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2335536880> &item=2335536880 Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=251812.3170658.4537139.1261774/D=egroupweb/S=170512 6215:HM/A=1652964/R=0/SIG=11t2ts2ch/*http://www.netflix.com/Default?mqso=6 0178276&partid=3170658> click here <http://us.adserver.yahoo.com/l?M=251812.3170658.4537139.1261774/D=egroupm ail/S=:HM/A=1652964/rand=697246299> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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