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TM 9-2330-398-24
4-1.
ENGINE ASSEMBLY REPAIR (continued).
WARNING
Drycleaning solvent P-D680 is toxic and flammable. Always wear protective
goggles and gloves, and use only in a well-ventilated area. Avoid contact with
skin, eyes, and clothes, and do not breathe vapors. Do not use near open flames
or excessive heat.
31.
Clean oil bypass valve, spring, and plug using drycleaning solvent and rag.
WARNING
Particles blown by compressed air can be dangerous. Be certain to direct air
stream away from user and other personnel In the area.
32.
Flush oil port clean using clean diesel fuel. Air-dry oil bypass valve port with compressed air.
33.
Soak all metal parts of oil bypass valve in clean container containing hydraulic fluid. Wipe dry using clean, lint-free
cloth and compressed air. Coat all components with oil prior to assembly.
34.
Measure diameter of bypass valve. If measurement shows less than 0.3365 inch (0.855 cm) minimum diameter,
replace valve. Maximum diameter should not exceed 0.3380 inch (0.858 cm).
35.
Measure free length of valve spring. If free length is less than 2.3125 + 0.0625 inch (5.874+ 0.159 cm), replace
valve spring.
36.
Inspect valve spring tension under load conditions. Using a compression scale, compress valve spring to 1.1875
inches (3.016 cm) and check the scale for 2.225 + 0.110 pounds (1.010 ± 0.050 kg) compression.
37. Inspect plug for evidence of worn or damaged threads. Replace plug if defective.
WARNING
Drycleaning solvent P-D680 is toxic and flammable. Always wear protective
goggles and gloves, and use only in a well-ventilated area. Avoid contact with
skin, eyes, and clothes, and do not breathe vapors. Do not use near open flames
or excessive heat.
38. Clean gearcase gasket mating surface using drycleanig solvent. Make sure mating surface is cleaned free of all
excess gasket material. Wipe dry using clean, lint-free cloth.
WARNING
Particles blown by compressed air can be dangerous. Be certain to direct air
stream away from user and other personnel In the area.
39. Flush gearcase clean with diesel fuel oil and dean out oil passages. Dry oil passages with compressed air.
40. Visually inspect gearcase for nicks or dents on gasket mating surface. Inspect for cracks. Inspect bolt holes for
damaged or excessively worn threads. Replace gearcase if damaged.
41. Inspect all components for evidence of excessive wear, scratches, and nicks. Replace defective components.
42. Measure distance from end of roll pin to mounting face of gearcase. Distance should be 0.781 inch (1.984 cm). If
necessary to replace pin, pin should be positioned with open end facing crankshaft seal.
4-19
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