Re: Head Bolt torque to angle methodology discussion - Saab Vintage Models Bulletin Board - Saabnet.com
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Re: Head Bolt torque to angle methodology discussion
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Posted by Don Wollum [Email] (more from Don Wollum) on Sat, 2 Dec 2017 12:19:45 Share Post by Email
In Reply to: Re: Head Bolt torque to angle methodology discussion, eric in vermont [Profile/Gallery] , Thu, 30 Nov 2017 14:54:33
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Hi Eric, The methodologies are both about ensuring adequate clamping pressure
on gasket to seal chambers. angle method starts with 22 ft pounds in pattern prescribed, then another 90 degrees in pattern. start, set timing, adjust carb ck leaks, turn off. after 20 minute cool down, then angle torque in pattern ( as is - no re-un-loosening ) 20 degree's more. then at 6-800 miles, when motor cool, turn 20 degree's more.
head mounting prep: if block top and head surface not arriving resurfaced from machine shop, there is 4x12 dry wall hand sander that will attacch and lower wny part that has arizen high, and clean to metal, long black anodized 80 then 180 or 200 grit packets are sold too ( Home Depo ) c NOTE, if piston/crank in block, used wads of paper towels soaked in wd-40 to catch any sanding grit. when removed from bores, hand wipe clean again. Clean head bolts threads with wire brush and lube with motor cycyle chain lube as well as under hex area and top side of head bolt washers. remove excess setting on paper towels.

torque wrench is better as: torque to 22 in pattern, then 36 pounds in pattern, then run to warm as described above, then I set torque wrench back to 22 lbs, and reverse pattern Re-un-loosen all bolts, then set back to 36 lbs. and use normal pattern and toque bolts.

repeat second part of retorquing again in 600 miles.

posted by 71.50.124...

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