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 1216 of 1563

TM 9-2815-220-24

CONNECTING ROD ASSEMBLY REPAIR

0143 00

INSPECTION (Continued)

7. Inspect connecting rod (1) bearings (5, 7).

a. Visually inspect connecting rod bearing halves (5).

BASIS FOR BEARING REJECTION

ACCEPTABLE BEARING FLAWS

Separation of bearing metal, or signs of possible

separation.

Fine scratches

on bearing surface.

Pieces of metal or dirt particles embedded in

bearing surface with a concentration of

5 per cent or more of the surface area.

Minute pieces of metal and dirt particles

embedded in bearing surface with a

concentration of less than 5 per cent.

(Do not

attempt to remove such particles.)

Pitting or any other form of destruction to

bearing surface.

Raised metal at edges of scratches.

b. Apply a thin coating of Prussian blue (item 25, WP 0173) to the backs of the connecting

rod bearing halves (5) to check contact area (after dimensional check).

c. Install bearing halves (5) in their respective connecting rods (1) and caps (4) according to

the location markings.

d. Apply lubricant (item 23, WP 0173) to rod bolt (8) threads and nut (3) seat.

e. Assemble rod (1) and cap (4) and torque-tighten progressively, first to 100-150 inch-

pounds, then to 600-650 inch-pounds (50-54 foot-pounds, or 68-73 N

•

m), and finally to

1250-1300 inch-pounds (104-108 foot-pounds, or 141-147 N

•

m).

WP 0143 00-6

1

8

4

3

5

5