Loosen all 6 of the head bolts just a little bit to break them. PASS 1 Torque Sequence: Torque to a maximum of 30% of the final torque value in accordance with the torque sequence. Torque Sequence: . Check all bolts at 100% torque with a circular pattern. Leave the head bolts at 30 foot pounds overnight. This will ensure that the stress is applied to the wheel evenly as the or bolts are tightened. 4. Work in a criss cross pattern, tightening the nut that is almost directly opposite from the nut that you just tightened. ... Torque bolts and nuts in a “CRISS-CROSS” sequence using a minimum of three torquing passes and the maximum bolt stress as defined. Do the tightening in STAGES, in a cross-pattern. Set the torque wrench to the 100% torque value and repeat the criss-cross pattern a third time. Use a torque wrench and in a criss-cross pattern, tighten them to 30 foot pounds. Set the torque wrench to the 70% torque value and repeat step 2. That is VERY IMPORTANT! Tightening them in a cross pattern reduces the likelihood of things shifting and flexing, which means that your lugs will stay tight after you torque them. Bolt tightening sequence or torque sequence is defined in the torque tightening procedure. Things can shift underneath even the tightest lug nut or bolt. 1, 3, 2, 4. 12. Criss-Cross Patterns Criss-cross patterns are called out when tightening or loosening parts with a simple square pattern or circular bolt pattern. 5. The idea is to completely avoid 'bunching up' the gasket. Based on experience, if the bolts are in a circular pattern, a criss-cross (star) tightening pattern would normally be specified. These basic patterns have been around for a very long time and are a proven method for evenly distributing clamping load across a part. Some manufacturers give a specific pattern to tighten the transmission pan bolts. When we cannot find a specific tightening sequence, at least tighten from the center, working out and using a criss-cross patten as above. Most cylinder heads will utilize this type of clamping pattern. For non-circular bolt patterns, a spiral pattern starting at the middle would normally be specified. Using the above diagram, tighten your lug nuts in the correct order that corresponds with the number of lug bolts your wheel has. Based on experience, if the bolts are in a circular pattern, a criss-cross sequence is normally specified. 10. 11. I don't see a lot of recommendations for tightening the head in a criss-cross pattern like a wheel or cylinder head. Torque pattern for 4 bolt flanges. Spiral tightening sequence. When tightening a four-bolt flange, use a criss-cross pattern. Do one amount of tightening using a cross pattern, then when all 14 bolts are at that tightness, increase the torque slightly and start the criss-cross-pattern tightening again. that particular flange until all bolts have been tightened once. Tightening the bolts. 4 bolt flanges, torque bolts in a criss-cross sequence.. Lookup flange bolt torque patterns on your phone in seconds Push the wheel home on the hub and using your socket wrench, tighten the wheel nuts just enough to hold the wheel snugly. Figure 2. Those are criss-crossed because it's a different kind of connection. Continue this sequence until all bolts are tightened. Go ahead and do the other cylinder. Bolt sequence: 1, 3, 2, 4. For . • The restof the bolts are installed and tightened after the structure is plumbed • A systematic pattern must be followed when tightening bolts so that a joint is drawn together and all fasteners are properly installed (SSTC 2001) Structural Bolting 4 Per the Occupational Safety & Health Administration Standard 1926.754(b)(2), “At A wheel or head or rear gear needs to have a certain pattern of tightening to allow a stress-free mating of 2 flat faces. For non-circular bolt patterns, a spiral sequence starting at the middle is specified (Figure 2). The first pass, lightly tighten the first bolt then move directly across or 180 degrees for the second bolt, then move1/4 turn around the circle or 90 degrees for the third bolt and directly across for the fourth. Service-data provides the pattern and the torque specification. 3. , if the bolts are in a criss-cross pattern a third time loosening parts with a simple pattern. 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