TASK 70-33-04-220-012
1 . General.
Use the following procedure for measuring spline wear when directed by the applicable engine manual.
2 . Equipment.
Subtask 70-33-04-220-121
A.Fine-bristle brush (Commercial).
B.Spline measuring kit (Commercial).
3 . Materials.
Subtask 70-33-04-220-122
 
Consumable Product
No.
 
A. Solvent, Stoddard
(P-D-680 Type 1)
C04-002  
 
B. Grease, General Purpose
C02-017  
 
C. Gear Marking Compound, No. 10
C05-001  
4 . Procedure.
Subtask 70-33-04-220-123
WARNING:
STODDARD SOLVENT P-D-680 IS COMBUSTIBLE- DO NOT USE NEAR OPEN FLAMES, NEAR WELDING AREAS, OR ON HOT SURFACES. PROLONGED CONTACT OF SKIN WITH LIQUID CAN CAUSE DERMATITIS. REPEATED INHALATION OF VAPOR CAN IRRITATE NOSE AND THROAT AND CAN CAUSE DIZZINESS. IF ANY LIQUID CONTACTS SKIN OR EYES, IMMEDIATELY FLUSH AFFECTED AREA THOROUGHLY WITH WATER. REMOVE SOLVENT-SATURATED CLOTHING. IF VAPORS CAUSE DIZZINESS, GO TO FRESH AIR. WHEN HANDLING LIQUID OR WHEN APPLYING IT IN AN AIR-EXHAUSTED, PARTIALLY COVERED TANK, WEAR APPROVED GLOVES AND GOGGLES. WHEN HANDLING LIQUID OR WHEN APPLYING IT AT UNEXHAUSTED, UNCOVERED TANK OR WORKBENCH, WEAR APPROVED RESPIRATOR, GLOVES AND GOGGLES.
CAUTION:
IF A GEAR MARKING COMPOUND HAS BEEN USED, REMOVE ALL RED OXIDE OR OTHER GEAR MARKING COMPOUND FROM INTERNAL AND EXTERNAL SPLINES. IF IT IS NOT REMOVED, SPLINE WILL WEAR FASTER.
A.Before inspecting, clean splines with a fine bristle brush and Stoddard solvent C04-002  .
B.Visually inspect the spline for wear. See Figure 1. If a step or unworn portion of the spline is noted, measure the wear by comparing the worn and unworn portions of the tooth. Use a dial indicator wherever possible. Wear limits, diameters over or under balls and sizes of balls are in the inspection tables in the applicable engine manual.
NOTE:
Measuring wear depth directly should be given preference over measurement over/under balls whenever possible. The use of wear depth method results in a higher acceptance rate than with the measurement over/under balls method. With the latter method, the wear depth varies and is dependent on original manufacturing tolerances.
C.When the tooth is worn uniformly across the entire surface so that there is no measurable step, and depth of wear cannot be determined, measure over or under balls as follows:
NOTE:
Use balls rather than pins wherever possible for measurement of wear because of the potential risk of the pins not being properly seated. Use of the incorrect balls when measuring wear will result in erroneous readings. Make positive identification of ball size. Extreme care must be exercised, particularly with internal splines, to ensure that balls are not hanging up.
(1)Measure spline diameter as shown in Figure 1.
(2)Use correct size balls. Do not use pins. Hold balls in place with a light coat of grease.
(3)For internal splines, use balls with a flat. Grind the flat on the ball as shown. The flat must face the root of the spline so that the ball does not touch the root when measuring.
(4)Measure the spline diameter at three places along the length of the spline.
(5)Inspect the part containing the spline for other defects as specified in the inspection tables in the applicable engine manual.
(6)Refer to the inspection table in the applicable engine manual for limits applicable to the part being inspected.
Figure 1   Spline Wear - Inspection