CYLINDER HEAD & VALVES - CONT - TM-5-3820-256-24-5

CYLINDER HEAD & VALVES - CONT - TM-5-3820-256-24-5_194

CYLINDER HEAD & VALVES - CONT - TM-5-3820-256-24-5_196

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 CYLINDER HEAD & VALVES Section 3 CLEANING, INSPECTION & REPAIR Clean Cylinder Head as follows: 1. Remove deposites from UPPER and LOWER DECK of head. Pay special attention to EXHAUST VALVE PORTS, VALVE SEATS, INJECTION NOZZLE SLEEVES and WATER DIRECTORS. a. Use non-caustic solvent and BRASS wire brush to clean bores. b. Blow out carbon deposits with compressed air after cleaning. Clean Valves as follows: 1. Remove residue from VALVE SPRINGS, VALVE HEAD, STEM and BORES of VALVE GUIDE. a. Clean with suitable solvent and a BRASS wire brush. b. Lightly polish valve surface with extremely FINE emery paper. NOTE: DO NOT USE STEEL BRUSHES these will scratch the surface and lead to valve failure. Clean Valve Guides as follows: NOTE: Valve guides must be thorougly cleaned prior to valve installation. Preform valve guide bore cleaning on: 1. New service valve guides. * 2. Valve guides installed in new service cylinder heads. 3. Valve guides presently installed in cylinder head, which meet bore specifications. Failure to clean valve guide bore can cause premature valve guide wear and in severe conditions, valve breakage. 1. Coat a nylon brush (which has a slightly larger diameter than the l.D. of the valve guide) WITH SOAP AND WATER. 2. Insert brush Into I.D. of valve guide and with a turning motion, run the brush through to insure removal of gum, carbon, deposits and rust preventive from the guide and spiral groove (See Fig. 15). Figure 15. - Cleaning Valve Guide Bores 3. THOROUGHLY coat guide with clean engine oil after cleaning operation is complete. NOTE: When installing valves and retainers do not use grease. Grease may stop the flow of lubricating oil into the valve guide and cause valve guide wear. *All valve guides furnished as service parts are reamed to size; however, it is necessary to ream guides to specified size after installation to remove any burrs or slight distortion caused by the pressing operation. BE EXTREMELY CAREFUL NOT TO REMOVE TOO MUCH MATERIAL. Always clean guides after this operation. CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 15

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