Rebuilding. (cont)

Figure 13-44. Valve Seat Insert, Cross Sections

TM-5-6115-593-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 600 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 (26) Finish grind with light touches of stone against face. (27) Check valve seat concentricity with valve seat indicator. (a) Use valve guide as center. (b) Total run out should not exceed 0.002 inch (0.05 mm). (c) The gauge must be a perfect fit on pilot mandrel. (28) Check seat with mating valve to ensure proper sealing. (29) Test valve spring on spring tester that is capable of accurate measurements of spring lengths by means of standards listed below. Valve spring part no. ............................ 211999 Approx. free length ........................... 2.685 in. (68.2 cm) Assemble height ............................... 1.724 in. (42.8 cm) Pounds (kilograms) required to compress New min. ....................................... 147.25 (66.3) New max. ...................................... 162.75 (73.2) Worn limit ....................................... 142.0 (63.9) (30) Spacers may be used under valve spring when insert and valve have been refaced to make valve spring check within load limit. NOTE A maximum of 1/16 inch (1.59 mm) spacers may be used under valve spring when head has been resurfaced and valve and seat have been refaced. (31) If valve springs compress to dimension shown, at less than load indicated under worn limits above, valve springs should be discarded and replaced. (32) Remove worn sleeves with a muffler sleeve cutting tool using extreme caution to prevent damage to head surfaces. (33) Remove all foreign material from injector sleeve sealing area. Clean O-ring groove to remove all foreign material. (34) Clean thoroughly and dry with compressed air. CAUTION Avoid use of cleaning compounds containing ammonia which may react with the brass sleeves. NOTE Machine head in sleeve seat area of head if mutilated. (35) Install seat cutter holder and position with pilot in a drill press. Set drill press speed at not more than 75 rpm. Cutter may be turned by hand using a tap wrench. (36) Place cylinder head on drill press table, allowing clearance for end of heat cutter to protrude below head surface into a pilot. A pilot can be made by recessing a 1/2-inch (12.7 mm) drill bushing in a plate which is centered below drill spindle and secured in place. (37) Before starting drill press motor, insert cutter, adapter, and pilot into injector bore to ensure proper alignment. (38) Lift cutter, adapter, and pilot, lubricate cutter with cutting oil and start cutting operation; apply a steady, moderate pressure. CAUTION Do not cut more than 0.010 inch (0.25 mm) deep. 13-85

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