12. I don't see a lot of recommendations for tightening the head in a criss-cross pattern like a wheel or cylinder head. Based on experience, if the bolts are in a circular pattern, a criss-cross (star) tightening pattern would normally be specified. Set the torque wrench to the 70% torque value and repeat step 2. Continue this sequence until all bolts are tightened. Based on experience, if the bolts are in a circular pattern, a criss-cross sequence is normally specified. ... Torque bolts and nuts in a “CRISS-CROSS” sequence using a minimum of three torquing passes and the maximum bolt stress as defined. Figure 2. Torque Sequence: . 4. Most cylinder heads will utilize this type of clamping pattern. When we cannot find a specific tightening sequence, at least tighten from the center, working out and using a criss-cross patten as above. Tightening the bolts. Using the above diagram, tighten your lug nuts in the correct order that corresponds with the number of lug bolts your wheel has. 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. 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. Spiral tightening sequence. 3. That is VERY IMPORTANT! 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. Work in a criss cross pattern, tightening the nut that is almost directly opposite from the nut that you just tightened. Push the wheel home on the hub and using your socket wrench, tighten the wheel nuts just enough to hold the wheel snugly. 4 bolt flanges, torque bolts in a criss-cross sequence.. Lookup flange bolt torque patterns on your phone in seconds Those are criss-crossed because it's a different kind of connection. Some manufacturers give a specific pattern to tighten the transmission pan bolts. This will ensure that the stress is applied to the wheel evenly as the or bolts are tightened. 11. Service-data provides the pattern and the torque specification. Bolt sequence: 1, 3, 2, 4. • 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 Things can shift underneath even the tightest lug nut or bolt. For non-circular bolt patterns, a spiral sequence starting at the middle is specified (Figure 2). Leave the head bolts at 30 foot pounds overnight. Check all bolts at 100% torque with a circular pattern. that particular flange until all bolts have been tightened once. The idea is to completely avoid 'bunching up' the gasket. Loosen all 6 of the head bolts just a little bit to break them. When tightening a four-bolt flange, use a criss-cross pattern. Do the tightening in STAGES, in a cross-pattern. Torque pattern for 4 bolt flanges. Go ahead and do the other cylinder. 1, 3, 2, 4. 10. PASS 1 Torque Sequence: Torque to a maximum of 30% of the final torque value in accordance with the torque sequence. For . Set the torque wrench to the 100% torque value and repeat the criss-cross pattern a third time. 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. Bolt tightening sequence or torque sequence is defined in the torque tightening procedure. These basic patterns have been around for a very long time and are a proven method for evenly distributing clamping load across a part. 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