TM-9-2815-200-35

ENGINE, WITH CONTAINER:TURBOSUPERCHARGED, DIESEL ,FUEL INJECTION ,90-DEGREE “V” TYPE, AIR - COOLED ,12 - CYLINDER , ASSEMBLY ;MODELS AVDS-1790-2M (2815-856-4996), AVDS-1790-2A AND AVDS-1790-2AM (2815-856-9005)

TECHNICAL MANUAL; DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS

TM-9-2815-200-35 - Page 360 of 779

Figure 6-57. Ultrasonic search fixture

installed in cylinder barrel

mounting flange.

(d) With the search fixture UPPER -

LOWER switch in the “UPPER” position ,

move the search fixture probe through the full

upward and downward travel.

Note.

When a heavy pulse echo enters the

right hand edge of the gate (view F, fig. 6-53),

the detector has reached the maximum down-

ward travel. Any alarm indicates a crack or

defect in the cylinder. Re-inspect the defect

suspect area.

If the alarm sounds again, the

cylinder must be scrapped.

Note.

Should the inspection reveal an

abnormally high cylinder reject rate, the tester

adjustments should be checked to be certain the

readings are correct.

(e) A signal appearing immediately to the

left of the gate indicates cylinder bore roughness.

The gate start may require minute adjustment

to the right to exclude this extraneous signal.

(f) Remove the search fixture from the

cylinder, empty the water, and remove the plug

from the bottom of the cylinder bore. If the

cylinder has no defects, treat it to prevent rust.

6-33. Repair

a. Cylinder Interior.

(1)

Valve guide replacement.

(a) Replace any cracked, galled, eroded,

or scuffed intake and exhaust valve guides (14

and 37, fig. B-4) or guides which do not conform

to limits specified in overhaul standards (table 6-

15). Replace and ream valve guides following

instructions which accompany figure s

6-58

through 6-62.

Note.

The intake and exhaust valve guides are

removed from the cylinder in the same manner.

Mechanical puller - 5120-448-0400 is used for

intake valve guide removal and mechanica l

puller - 5120-448-0401 is used for exhaust valve

guide reinoval.

1. Insert screw of mechanical puller - 5120-448-0400

through the valve guide and puller (A).

2. Install nut (B) on end of puller screw and tighten to

remove valve guide from cylinder.

Figure 6-58. Removing intake valve guide

using mechanical puller - 5120-448-0400.

6-66