APPLICATION

GENERAL INFORMATION - SEALING COMPOUND USE

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL INTRODUCTION Introduction APPLICATION Cap Screws and Pipe Threads Fill the first 2 to 3 leading threads in area of engagement with compound. For large quantities of cap screws, may also be applied by tumbling method (refer to manufacturer’s instructions). Studs Apply by hand to individual studs. Fill full length of thread with one strip on diameters up to 25 mm (1 inch), two strips 180° apart on diameters up to 50 mm (2 inches), and three strips 120° apart on diameters over 50 mm (2 inches). In all cases apply one strip into tapped holes. Blind hole applications - apply enough compound to fill the bottom 2 to 3 threads of engagement, then insert stud. If engagement length exceeds one diameter use proportionally more compound. For non-seated studs (studs that can go deeper in hole than required) turn stud one turn deeper than required. After bubbling stops, apply a ring of compound around stud at top of hole, then turn back to required height. Face Sealant (Plastic Gasket) Spread an even coat 1 cc per 260 cm²(40 sq. inches) on one of the mating surfaces. Assemble and tighten bolts. NOTE: On crawler tractor applications only, when compound is used as a gasket, bolts which attach the parts should be coated with MPL (gear lubricant) to prevent compound from sticking to bolts. APPLICATION AT LOW TEMPERATURES 1. Without special precautions, these compounds can be applied and will cure at temperatures down to 10°C (50°F), and at that temperature full strength will be obtained within 72 hours. 2. At temperatures from 10° to -18°C (50° to 0°F), the use of primer is recommended. 3. If necessary, the compounds can be applied at temperatures below -180C (0°F), only if heat is used to accelerate the cure as follows: 65°C (150°F) for 60 minutes 93°C (200°F) for 45 minutes 120°C (250°F) for 30 minutes SETTING TIME (BEFORE PLACING IN OPERATION) 1. Normal time for compound grades without use of any primer - 6 to 24 hours at room temperature with machined carbon steel parts. Higher temperatures will accelerate cure and lower temperatures will retard cure. Other base metals will provide more or less catalytic effect on cure. 2. Primed surfaces - 2 to 6 hours. This may be speeded by pretreating mating surfaces with special primers. Some metals (such as zinc and cadmium plate, anodized aluminum, and passivated stainless steel) are inactive and require heat or primer to cure the compound. 3. A fast curing type primer will fix parts for normal handling in 10 to 15 minutes and will achieve 75 percent of ultimate strength in 1 hour and full cure in 2 to 4 hours. REMOVAL Parts difficult to remove can be preheated to 205° to 260°C (400° to 500°F) prior to removal. CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 15

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