147 Franklin Airman Posted July 17, 2021 Share Posted July 17, 2021 Hi Does anyone know what the torque setting should be on the cylinder head bolts on a 1929-25 6 cylinder standard engine? Link to comment Share on other sites More sharing options...
Rock10 Posted July 17, 2021 Share Posted July 17, 2021 Link to comment Share on other sites More sharing options...
147 Franklin Airman Posted July 17, 2021 Author Share Posted July 17, 2021 31 minutes ago, Rock10 said: Many thanks Rock10 1 Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted July 18, 2021 Share Posted July 18, 2021 (edited) I do not think the head bolt tightening sequence is correct on that non GM worksheet. It goes against how I have been taught long ago about tightening cylinder heads. This is the correct head bolt sequence from GM for 1926 Buick. The Buick head is an odd bolt layout. It is treated with some bolts that are close together "as pairs" and works it's way in a circular pattern from the middle to the ends. Working evenly from the middle to the ends is how we do it today. That other one is very non conventional and I have never seen anyone tighten bolts down one side starting from the middle. That drawing has made it's rounds. This photo is from the 1926 GM export manual. Also made an update to the attached thread. This error is likely in many places where people have asked for Buick torque and head tightening sequence. Hugh Edited July 18, 2021 by Hubert_25-25 (see edit history) 2 Link to comment Share on other sites More sharing options...
Rock10 Posted July 18, 2021 Share Posted July 18, 2021 7 minutes ago, Hubert_25-25 said: See my update to the attached thread. This error is likely in many places where people have asked for Buick torque and head tightening sequence. Hugh Thanks. I didn't see the update. Just the original pic. Link to comment Share on other sites More sharing options...
Larry Schramm Posted July 18, 2021 Share Posted July 18, 2021 1 hour ago, Hubert_25-25 said: I do not think the head bolt tightening sequence is correct on that non GM worksheet. It goes against how I have been taught long ago about tightening cylinder heads. This is the correct head bolt sequence from GM for 1926 Buick. The Buick head is an odd bolt layout. It is treated with some bolts that are close together "as pairs" and works it's way in a circular pattern from the middle to the ends. Working evenly from the middle to the ends is how we do it today. That other one is very non conventional and I have never seen anyone tighten bolts down one side starting from the middle. That drawing has made it's rounds. This photo is from the 1926 GM export manual. Also made an update to the attached thread. This error is likely in many places where people have asked for Buick torque and head tightening sequence. Hugh I agree with Hugh on this being the correct head bolt tightening sequence. 3 Link to comment Share on other sites More sharing options...
147 Franklin Airman Posted July 18, 2021 Author Share Posted July 18, 2021 20 hours ago, Hubert_25-25 said: I do not think the head bolt tightening sequence is correct on that non GM worksheet. It goes against how I have been taught long ago about tightening cylinder heads. This is the correct head bolt sequence from GM for 1926 Buick. The Buick head is an odd bolt layout. It is treated with some bolts that are close together "as pairs" and works it's way in a circular pattern from the middle to the ends. Working evenly from the middle to the ends is how we do it today. That other one is very non conventional and I have never seen anyone tighten bolts down one side starting from the middle. That drawing has made it's rounds. This photo is from the 1926 GM export manual. Also made an update to the attached thread. This error is likely in many places where people have asked for Buick torque and head tightening sequence. Hugh Many thanks Hugh, That is the correct picture of my cyl head. 2 Link to comment Share on other sites More sharing options...
Robert Engle Posted July 19, 2021 Share Posted July 19, 2021 In my opinion, the real key to torqueing cylinder heads is to torque in small increments, I usually start at about 25 ft-lbs, starting near the center and working circularly till all are done. then I torque again at 35ft-lbs circularly again. I keep working up in increments until the final desired torque is reached. Then after running the engine to get it warm, do one final check. The torque settings are also dependent on using the original correct grade of headbolts. Too many people think a grade 8 bolt is better than the original grade. The purpose of torqueing the bolts is to get the correct stretch in the bolts so they maintain tension throughout all operating conditions. Bob Engle 3 Link to comment Share on other sites More sharing options...
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