CLEANING AND INSPECTION - TM-5-2410-237-231345

TM 5-2410-237-23

PISTONS, CONNECTING RODS, AND BEARINGS MAINTENANCE - CONTINUED

0245 04

CLEANING AND INSPECTION - CONTINUED

WARNING

Solvent cleaning compound MIL-PRF-680 Type III is environmentally compliant and low toxic material.

However, it may be irritating to the eyes and skin. Use protective gloves and goggles. Use in well-ventilated

areas. Keep away from open flames and others sources of ignition. Failure to follow this warning may cause

injury or death.

Pay particular attention to all oil passages in castings and machined components. Oil passages must be clean and free of

any obstructions.

Clean oil passages with wire probes to break up any sludge or gum deposits.

Wash oil passages by flushing with solvent cleaning compound.

Dry oil passages with compressed air.

Inspect parts for wear and cracks. Inspect for cracks using a magnifying glass and a strong light. Inspect machined sur-

faces for nicks, burrs, or raised metal. Replace as necessary.

ASSEMBLY

Clean used piston grooves with an acceptable ring groove tool.

NOTE

The flat edge of the gauge must be between grooves for the top ring and intermediate ring. If there is clear-

ance between the flat edge of the gauge and the piston at all test locations, for both grooves, reuse the piston.

If the flat edge is in contact with the piston, at any of the test locations, do not reuse the piston. Install a new

piston.

Use ring groove gauge group to measure the grooves. Install the pin end in the groove at four places around the circum-

ference. Do this to both grooves. See Table 1.

NO GAP

PIN END OF GAUGE

FLAT END

OF GAUGE

GAP

REUSABLE

NOT REUSABLE

421-0107

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