Head gasket
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Any "leak stopper" or head gasket "repair additive" should be avoided. Use of such products leads to further engine damage, such as seized or leaking water pumps, clogged water or oil passages, or clogged radiators and thermostats. If you use these products, be aware of possible problems caused by them. | Any "leak stopper" or head gasket "repair additive" should be avoided. Use of such products leads to further engine damage, such as seized or leaking water pumps, clogged water or oil passages, or clogged radiators and thermostats. If you use these products, be aware of possible problems caused by them. | ||
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| + | ==Head gasket torquing== | ||
| + | Follow the sequence for the engine being worked on. If no sequence can be found, start from the inner fasteners and work outward. | ||
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| + | Use at least three steps, i.e. if the torque is 65 ft/lb, torque the first step to 20 ft/lb, second step to 40 ft/lb and the last step to 65 ft/lb. | ||
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| + | [[File:80632permatex.jpg|right]] | ||
| + | If using OEM fasteners, most times the recommendation is for the clean threads to be lubricated with motor oil before torquing. Fasteners that enter the cooling jackets have to be sealed. Various sealants can be used depending on personal preference. Some sealers are: | ||
| + | *Hylomar | ||
| + | *Permatex #2 | ||
| + | *Permatex High Temp Thread Sealant | ||
| + | *Permatex High Performance Thread Sealant 56521 | ||
| + | *Permatex 80632 with teflon | ||
| + | *[http://www.summitracing.com/parts/ARP-100-9904/ ARP thread sealer] | ||
| + | *Locktite thread sealant | ||
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| + | Follow the factory torque specs unless aftermarket fasteners are used. In that case, follow the fastener manufacturer's directions for what type of lube to use and what torque to use- this will often differ from the factory specs. | ||
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| + | {{Note1}} Do not use RTV or any type of sealant or adhesive that hardens or sets up. The sealant needs to be pliant, not hardened or brittle. | ||
===Head gasket re-torquing=== | ===Head gasket re-torquing=== | ||
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*Retracing the original torque pattern one fastener at a time, slightly loosen the bolt or nut (to overcome the friction set), then re-torque to the specified torque setting | *Retracing the original torque pattern one fastener at a time, slightly loosen the bolt or nut (to overcome the friction set), then re-torque to the specified torque setting | ||
| − | It is suggested by some to retorque cast iron heads/blocks while still warm (not hot). | + | {{!}}It is suggested by some to retorque cast iron heads/blocks while still warm (not hot). Whether or not this is done when using iron castings (research this beforehand) is up to the builder. But this should NOT be done with aluminum blocks or heads. |
===When replacing a blown head gasket=== | ===When replacing a blown head gasket=== | ||
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