ENGINE MAINTENANCE. (cont) - TM-5-3805-261-34

ENGINE MAINTENANCE. (cont) - TM-5-3805-261-34_838

ENGINE MAINTENANCE. (cont) - TM-5-3805-261-34_840

TM-5-3805-261-34 Grader Heavy Road Motorized (Caterpillar Model 130 G) Manual
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TM 5-3805-261-34 ENGINE MAINTENANCE. 13-3. Cylinder Head Assembly Overhaul. (Sheet 4 of 6) INSPECTION/REPAIR 4. Using magnetic particle, magnaflux or dye penetrant method, inspect combustion surface. Magnetic particle is preferred. Discard and replace head if cracks appear between valve seats or between valve seats and injector adapter holes. If cracks are in other areas and are less than 0.25 inch long and 0.125 inch deep, repair by welding. 5. Inspect combustion surface for damage and erosion across fire ring, seat area, between injector nozzle hole and valve seat area (Figure 13-9). Discard and replace head if erosion is severe. If erosion is slight, refer to step 11 for grinding instructions. 6. Using valve guide gage group, plug gage or equivalent measure inner diameter of both ends of each of eight valve guides. Maximum diameter is 0.3772 inch, minimum diameter is 0.3723 inch. Remove and replace guides worn beyond limits. Refer to paragraph 3-8. 7. Inspect all threaded holes for damaged threads, broken bolts or studs. Extract all broken bolts and studs. Repair damaged threads with threaded inserts. Figure 13-9. Go to Sheet 5 13-13

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