Updates help prevent comebacks

Suggested updates help prevent comebacks for Isuzu truck ImageImageImageThe Dacco part number T0-67, which can be found in the ‘98 and newer Isuzu truck, appears to be unorthodox in design. With a large diameter pilot supported by a mere spot-weld, and twenty pounds of rotating steel used as mounting pads, at first glance this converter looks quite awkward. Do not let its appearance intimidate you. The interior of this converter is designed like a typical Toyota torque converter.

After separation of the core, you most likely will find a worn out, or broken, front cover thrust washer and worn clutch liner. The stator to impeller bearing and stator cap are almost always replaced with an updated version.

When rebuilding this converter for a customer, it is suggested to inform the customer of the high rate of destruction this core is known for. Most will agree thirty percent of these converters are non-rebuildable. Using these updated parts help prevent unnecessary converter comebacks.

Special attention needs to be given to the pilot. During handling, many cores are damaged causing cracked or missing pilots. Not to fear! Sonnax offers a replacement version, which is considerably better than the OEM pilot.

The next area of concern is the lockup clutch liner replacement. To reline this piston, use a chemical strip or abrasive removal of the original clutch liner is the recommended method. Machining or resurfacing of the piston is not suggested or required. For final cleanup before bonding, a quick scuffing of the surface with a coarse emery cloth will provide an adequate bonding surface. It is suggested to use a paper-type replacement wafer. Carbon-type replacement wafers on liners are not recommended or required. Remember, no thinning or machining of the piston is recommended. This will only weaken the piston.

The area commonly overlooked is the disassembly of the stator and sprag assembly. Although the condition of the components are usually acceptable, a thorough cleaning must be done as this is a natural collection area for trash. Friction material and metal debris are often found lurking in this location. Additional time spent here will be prevent a possible comeback.

Although these instructions seem simple, they are necessary to rebuild a high-quality Toyota converter.

January, 2006 Newsletter