Automatic Transaxle - Overhaul (FN4A-EL): Specifications Mazda 3 BL

TORQUE CONVERTER OUTLINE

1. The torque converter clutch mechanism mechanically engages the pump impeller and the turbine runner under a certain condition, and transmits the power, not through the fluid, but directly, preventing the slip loss of the torque converter.
2. The torque converter has obtained sufficient transaxle efficiency and torque converting ratio that matches the output characteristic of each engine.

Scheme 1

TORQUE CONVERTER STRUCTURE

1. The torque converter with the TCC control consists of the turbine runner, pump impeller, stator, and the TCC piston as shown in the figure. The TCC piston engages with the turbine runner and slides on the turbine hub to be pushed and contacts with the torque converter cover during the TCC control operation. In the TCC piston, a spring for torsion damper is installed to absorb the engine torque fluctuation during TCC control.

Scheme 2

Torque Converter Inspection

1. Inspect the outer surface of the torque converter for damage or cracks, and replace it if necessary.
2. Inspect for rust on the pilot hub of the torque converter or on the boss. If there is any, remove the rust completely.

Scheme 3

1. Measure the bushing of the oil pump. Bushing inner diameter Torque converter side Standard: 40.015-40.040 mm {1.57539-1.57637 in} Maximum: 40.060 mm {1.57716 in} Forward clutch side Standard: 19.000-19.021 mm {0.74803-0.74885 in} Maximum: 19.041 mm {0.74964 in}
2. If not as specified, replace the oil pump housing and oil pump cover. (See «OIL PUMP DISASSEMBLY/ASSEMBLY»(ref-345201-S05491425612009102000000) ).