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C1 Clutch Pack Components
A. C1 Clutch
Pack B. C1 Clutch Backplate
F. C1 Piston Housing
D. C1 Return
Spring
Assembly
C. C1 Clutch Piston H. C1 Clutch Balance Piston
A. Inspect friction plate contact faces for excessive wear, embedded metal particles, cracking and distortion. Inspect the plate splines for burrs, cracks and damaged spline teeth. Replace the plate if spline damage cannot be repaired using a soft stone or crocus cloth. Minimum allowable friction plate thickness is 2.375mm (0.0935 inch). Minimum allowable oil groove depth is 0.20mm (0.008 inch). Maximum allowable coning is 0.225mm (0.009 inch). NOTE: Anti-freeze (glycol) and/or water will adversely affect the bonding agent between the friction material and steel core. Replace any friction plates which have been exposed to water and/or glycol. Friction material which is loose or flaking indicates that the plates have been exposed to glycol and/or water. Reference SIL 18-TR-98, Rev. A for details.
NOTE: Battered and worn spline teeth may be an indicator of driveline issues. Replace the clutch plates and check the driveline. Inspect reaction plate contact surfaces for chips, cracks, grooves, scoring and signs of discoloration. Inspect reaction plate tangs for chips, cracks and signs of battering. Replace the plate if damage cannot be repaired using a soft stone or crocus cloth. Replace the plate if any tangs are broken, bent or otherwise distorted. Minimum allowable plate thickness is 2.135mm (0.0841 inch). Maximum allowable coning is 0.20mm (0.0079 inch). B. Inspect the C1 clutch backplate. Replace the backplate if has burrs, scoring or other damage which cannot be repaired using a soft stone or crocus cloth. Replace the backplate if it is cracked or broken. Check the backplate for coning. Replace the backplate if any coning is detected. Minimum allowable plate thickness is indicated in the chart above.
E. C1
Drive
Hub
G. Thrust
Bearing
ID Minimum Thickness
2420 11.400 mm (0.4488 inch) 6221/8521 11.840 mm (0.4661 inch) 6222/8522 12.280 mm (0.4835 inch) 6223/8523 12.730 mm (0.5012 inch) 6224/8524 13.180 mm (0.5189 inch) 6225/8525 13.630 mm (0.5366 inch)
Inspect drive hub splines for wear and battering. Supersession Information
C1 Drive Hub And T1 Thrust Bearing Updates - Reference SIL 23-1K2K-04
Inspect the C1 clutch piston internal and external sealring grooves.
C. Inspect the C1 clutch piston for burrs, chips and cracks. Inspect the internal and external sealring grooves for burrs, chips and cracks. Replace the piston if damage cannot be repaired using a soft stone or crocus cloth.
D. Inspect the C1 clutch return spring plate for cracks, chips, burrs, bends and distortion. Replace the plate if damage cannot be repaired using a soft stone or crocus cloth. Replace the assembly if springs are broken, cracked, permanently set, showing signs of wear due to rubbing or showing signs of discoloration. Reference the Service Manual Spring Data Charts for spring specifications and identification.
E. Inspect the C1 drive hub. Inspect the rear of the hub for damage caused by contact with the main shaft. Replace the hub if damage cannot be repaired using a soft stone or crocus cloth.
Piston housing check ball must have at least 1.00 mm free travel. Drive Hub And Bearing Updates Necessitate New Clutch Pack Clearance Check Procedures And Tooling.
Inspect the internal and external
housing splines and the hub
splines for step wear, twisting, chips, burrs and signs of battering. Replace the assembly if damage cannot be repaired using a soft stone or crocus cloth. Maximum allowable spline wear is 0.38mm (0.015 inch). F. Inspect the C1 clutch piston housing for burrs, chips and cracks. Inspect the area where sealrings ride for grooves and scoring. Replace the piston if damage cannot be repaired using a soft stone or crocus cloth. The check ball must move freely and have a minimum of 1.00mm (0.040 inch) travel parallel to the housing’s centerline.
G. Inspect the thrust bearings on both sides of the C1 hub. Replace the bearing if it fails any of these inspection procedures. H. The C1 balance piston includes a bonded seal. Replace the piston during overhaul.
