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techtalk:ref:engmech02g [2019/12/09 17:03] hippysmack created |
techtalk:ref:engmech02g [2019/12/09 17:12] hippysmack [Installing MLS Head Gaskets] |
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| ====== REF: Engine Mechanicals - Sub-02G ====== | ====== REF: Engine Mechanicals - Sub-02G ====== | ||
| ====== Installing MLS Head Gaskets ====== | ====== Installing MLS Head Gaskets ====== | ||
| + | Cometic MLS head gasket torque: | ||
| + | There are six torque values in sequence: 9-14-22-35-42-42 (all in ft/lb) \\ | ||
| + | When using aftermarket gaskets, it's important to note that the torque values in the FSM are for OEM gaskets. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5793537#post5793537)) \\ | ||
| + | The OEM gaskets offer a squeeze factor unavailable with steel gaskets. \\ | ||
| + | When using the MLS torque specs, you'll find they are not that different from the FSM. \\ | ||
| + | For instance, after you get to 9 ft/bs, it's about a quarter turn to 14, then about a quarter turn to 22 and so forth. \\ | ||
| + | But using the actual values instead of counting turns gets a more even pull on all sides and allows you to feel when something isn't right. \\ | ||
| + | To torque the heads, start with all four bolts loose and then snug them all by hand. Do one head at a time. \\ | ||
| + | Tighten in sequence 1-2-3-4 to 9 ft/lbs. Then do the entire sequence again to 14 ft/lbs and so on until you reach full torque. | ||
| + | Pay attention to how the bolts pull. They should not spring back when you let go after turning them. \\ | ||
| + | That would mean your bolts are stretching and would need to be replaced. \\ | ||
| + | That would also mean they loosened after you thought you had them to the right torque value. \\ | ||
| + | Do not use oil in the cap nuts (only a very light 'touch' on the bolt threads for smooth mesh of the mating threads. \\ | ||
| + | Using too much oil on the studs or cap nuts can hydrolock the nuts and you'll never get the proper torque. \\ | ||
| + | Hydrolock of the nuts stops the nut from turning on the stud threads and the only thing the stud can do when torqued from there is stretch (twist). \\ | ||
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| + | Tighten the nuts in the same sequence as is in the FSM using the above torque values. \\ | ||
| + | If you don't follow this sequence while tightening, the studs or the nuts can easily back out. \\ | ||
| + | Example: \\ | ||
| + | You can tighten nuts 1 and 2 and then tighten 3 or 4 tighter than you did 1 and 2 and all of a sudden 1 and 2 are now both loose. \\ | ||
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| + | Torque Sequence: \\ | ||
| + | {{:techtalk:evo:engmech:head_torque_sequence_by_hippysmack.jpg?direct&350|}} ((photo by Hippysmack http://xlforum.net/forums/showthread.php?p=5793537#post5793537)) \\ | ||
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