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 TM 55-1905-223-24-3
3-26. REPAIR CRANKSHAFT GROUP.
This task covers:
REPAIR
INITIAL SETUP:
Tools
Equipment Condition
Tool kit, general mechanic's
Engine cooled below 120F (50 C).
rail and marine diesel engines,
Air supply secured (port).
Battery banks disconnected (starboard).
Dial indicator gauge P/N 3376050
TM 55-1905-223-10.
Materials/Parts
Lubricating oil, Item 2, Appendix C
Fluid pressure dampener P/N 217323
Crankshaft end guide studs, Item 53,
REPAIR
a. Remove the dampener belt guard.
b. Check the vibration dampener for eccentricity and wobble as follows:
(1) Install the dial indicator on the gear cover as shown in Figure 3-81.
(2) Rotate the crankshaft and record the indicator movement.
(3) Replace the vibration dampener if the eccentricity exceeds 0.0004 inch (0.10 mm) per 1.0 inch (25.4
mm) of the dampener diameter.
(4) Install the dial indicator as shown in Figure 3-82 to measure wobble.
(5) Push the crankshaft to the front or rear.
(6) Rotate the crankshaft 360 degrees, maintaining the position of the
crankshaft (either toward the front or the rear) in relation to the block.
(7) Record the total indicator motion.
(8) Replace the dampener if wobble exceeds 0.007 inch (0.18 mm) per 1.0 inch
(25.4 mm) of radius.
c.
Remove one of the capscrews and recessed washers (1, Figure 3-83) that hold the vibration
dampener and the pulley to the crankshaft and install a guide stud (2) in the hole.
3-131
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