ALLISON 1000 & 2000 PRODUCT FAMILIES
TORQUE CONVERTER B. Converter Stator (Inside Converter)
A. Converter Exterior C. Converter Hub
A. Visually inspect the converter exterior for impact damage and signs of discoloration. The ribs on the back of the pump housing are used by the engine speed sensor to detect converter rotation. Replace the converter if any ribs are damaged or deformed.
NOTE: Erratic speed sensor signals
B. Inspect the stator for proper
can be caused by a dented torque converter or deformed torque converter ribs. Inspect the converter carefully. Dents and deformities are sometimes hard to identify.
locking and freewheeling action. The stator inner race should lock when rotated counterclockwise and rotate freely when rotated clockwise. Check the stator with the converter on its edge, and with the converter placed at a 45 degree angle, hub down. Replace the converter if the stator fails this inspection.
The converter must not show signs of leakage when pressurized to 517 kPa (75 psi) and submerged in water. If bubbles appear during this test, the converter is leaking and must be replaced. After pressure testing the torque converter, all air pressure must be exhausted from the converter before loosening the test fixture nut.
NOTE:
Dented converter near rib creates erratic speed sensor signal. 22
ALLISON
TRANSMISSION
2005 General Motors Corporation.
TECHNICIANS’
GUIDE
Check converter endplay following Service Manual SM3191EN guidelines. Replace the converter if endplay exceeds 1.015 mm (0.040 inch). (continued)
