TM-9-2815-220-24

AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL FOR AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines

TM-9-2815-220-24 - Page 1199 of 1563

TM 9-2815-220-24

PISTONS, RINGS, AND ASSOCIATED PARTS REPLACE/REPAIR

0142 00

THIS WORK PACKAGE COVERS:

Disassembly, Cleaning, Inspection, Repair, Assembly

INITIAL SETUP:

Tools and Special Tools:

General mechanic’s tool kit (item 121, WP 0176)

Inside micrometer caliper set (item 16, WP 0176)

Magnifying glass (item 73, WP 0176)

Outside micrometer caliper set

(item 17, WP 0176)

Piston ring gauges:

(WP 0176)

0.010 and 0.030 in. oversize (item 49)

Standard and 0.020 in. oversize (item 52)

Standard and 0.040 in. oversize (item 50)

Top ring groove (item 51)

Ring remover and replacer (item 78, WP 0176)

Telescoping gauge set (item 54, WP 0176)

Inspection kit, dye (item 35, WP 0176)

Expendable Materials:

Carbon-removing compound (item 7, WP 0173)

Cleaning compound, solvent (item 8, WP 0173)

Cloth, abrasive, crocus (item 9, WP 0173)

Personnel Requirements:

Track Vehicle Repairer (1) 63H10

Equipment Conditions:

Engine on maintenance stand (WP 0130)

Cylinder assembly and piston removed

(WP 0133)

DISASSEMBLY

WARNING

Use goggles, rubber gloves, and rubber apron when cleaning parts in

carbon removing compound.

Provide adequate ventilation.

Avoid

inhalation of fumes and skin contact.

If compound is splashed on

skin, flush with fresh water and wash with alcohol.

Alcohol

containing 2 to 3 percent camphor is preferable.

1. Check to see if piston rings are free in piston

grooves before removal.

Grooves

Rings

a. Soak pistons with stuck rings in carbon

removing compound (item 7, WP 0173).

Rings must be loose in their respective

grooves prior to removal.

WP 0142 00-1