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

CYLINDER HEAD & VALVES - CONT - TM-5-3820-256-24-5_195

CYLINDER HEAD & VALVES - CONT - TM-5-3820-256-24-5_197

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 Inspect and Repair Cylinder Head as follows: 1. Visually inspect head for cracks using modern spraying methods. a. Spraying WILL expose hair line cracks or sand holes. b. Spraying WILL NOT show nozzle sleeve leaks as pressure testing will. c. If cracks are found, replace cylinder head. d. If NO cracks are found, continue with Step 2. 2. Pressure test cylinder head as follows: a. Fabricate gasket as shown in Fig. 16.Use 3 mm (1/8 in) rubber. Figure 16. - Thermostat Housing Gasket b. Fabricate bottom pressure plate, to cover water directors, as shown in Fig.17 for 300 and 400 series engines. Use 13 mm (1/2 In} aluminum for a permanent plate or plywood of the same dimension for a temporary plate. c. Remove valves and install injection nozzles. d. Attach fitting to thermostat housing with pressure gauge. Run hot water at 69-83 kPa (10-12 psi) Into head. e. Visually observe head for leakage at: 1. Injection Nozzle Sleeve Flanges 2. Upper Deck 3. Lower Deck 4. Ports CGES-185-3 PRINTED IN UNITED STATES OF AMERICA Page 16

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