AUTOMATIC TRANSMISSION (4 A / T)
7B1-77
UNIT REPAIR
NOTE:
Refer to the same section of the Unit Repair Manual mentioned in FOREWORD of this manual for the de-
scriptions not found in this item.
When repairing automatic transmission, it is necessary to conduct the on-vehicle test to investigate where the
cause of the trouble lies first.
Then whether overhaul should be done or not is determined. If the transmission is disassembled without such pre-
liminary procedure, not only the cause of the trouble would be unknown, but also a secondary trouble may occur
and often time would be wasted.
PRECAUTIONS
As the automatic transmission consists of high precision components, the following cautions should be strictly ob-
served when handling its parts in disassembly and reassembly.
D
Disassembling valve body assembly is prohibited essentially. However, a few parts can be disassembled.
When disassembling valve body component parts, confirm whether their parts are allowed to disassemble or not
referring to “VALVE BODY ASSEMBLY” in this section.
D
Make sure to wash dirt off from the transmission so that no such dirt will enter the transmission during dismounting
and remounting.
D
Select a clean place free from dust and dirt for overhauling.
D
Place a rubber mat on the work bench to protect parts from damage.
D
Work gloves or shop cloth should not be used. (Use a nylon cloth or a paper towel.)
D
When separating the case joint, do not pry with a screwdriver or such but tap with a plastic hammer lightly.
D
Make sure to wash dirt off from the transmission so that no such dirt will enter the transmission during disassem-
bly and reassembly.
D
Wash the disassembled parts in ATF (Automatic Transmission Fluid) or kerosene (using care not to allow ATF
or kerosene to get on your face, etc.) and confirm that each fluid passage is not clogged by blowing air into it.
But use ATF to wash the disc, resin washers and rubber parts.
D
Replace each gasket, oil seal and O-ring with a new one.
D
Apply ATF to sliding or rotating parts before reassembly.
D
A new disc should be soaked in ATF at least 2 hours before use.