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TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download

Page 314 of 532

I TM 9-2815-220-34 3-72. Repair a. Cylinder Interior. (1) Valve guide re p lacement. (a) Replace any cracked, galled, ered, or scuffed intake and exhaust valve guides (6 and V, fig. 3-1Z) or guides which do not conform to limits specified in repair standards (table 3-13). NOTE The intake and exhaust valve guides are removed from the cylinder i n the same manner. Mechanical puller Part No. 1(82953 is used for intake valve guide removal and mechanical puller Part No. 1(82954 is used for exhaust valve guide removal. (b) Insert screw of mechanical puller Part No. 10X2953 through the valve guide and puller (fig. 3· 186). Install nut on end of puller screw and tighten to remove valve guide from cylinder. WARNING Wear oves when hand ng heat ed parts. NOTE Preheat entire assembly in oven to 360°F. maximum before removing valve guide. TA02l62l Fisure 3°194. Hc111ovins i111ae valve guide wi11g mecho11lcol puller. 3-104 Change 3 NOTE The intake and exhaust valve guides are installed in the same manner. Valve guide replacer Part No. 108S052 is used for replacing intake valve guide, and valve guide replacer Part No. 10X3053 is used for replacing exhaust valve guide. Heat cylinder assembly to 350°F. max. and chill guides before installing. (c) Remove ferrule (fig. 3-195) from end of valve guide replacer. (d) Place new valve guide over replacer with short end of guide entering hollow replacer handle. Replace ferrule to retain guide or replacer. INTAKE VALVE GUIDE REPLACER \ GUIDE FERRULE TA021620 Fis1ue 3·195. PoJitioning intae valve guide on valve guide replacer. (e) Place �ssembled intake valve guide (fig. 3- 1`) and valve guide replacer Part No. 108S052 into valve guide bore in cylinder. Carefully drive guide into cylinder until flange on ide is positioned against top face of guide bore. Remove ferrule from replacer and withdraw replacer from valve guide. Install exhaust valve guide in the same manner using valve ide replacer Part No. 10X8058. ) )