S15/T15 Jimmy 2WD L4-119 1.9L VIN A 2-BBL (1983)
Technical Service Bulletin # 83T43
Date: 830501
A/T - Diagnosis for Burned 2-4 Band or 3-4 Clutch
Number:
83-T-43
Section:
VIIc
Date:
May, 1983
Subject:
DIAGNOSIS PROCEDURE FOR A BURNED 2-4 BAND AND/OR 3-4 CLUTCH 700-R4 1982-83 ALL MODELS - PASSENGER
CARS AND TRUCKS
TO:
ALL CHEVROLET DEALERS
The following diagnosis procedure is for a burned 2-4 band and/or a burned 3-4 clutch. The probable customer comment for these
conditions would be: 1) slipping 1-2 shift or no 1-2 shift and/or 2) slipping 2-3 shift or no 2-3 shift. This procedure is a general guide and
you will need to refer to your service manual for additional information if questions arise.
SERVICE PROCEDURE
1.
Verify the condition as follows:
a)
Check and correct the oil level.
b)
Check the T.V. cable for sticking or binding. Adjust the T.V. cable.
c)
Road test the vehicle at normal operating temperature and check oil pressure.
2.
For conditions of high or low oil pressure, refer to the service manual for proper diagnosis.
3.
As a diagnosis aid, you can check the oil pressure differential between line pressure and the second, third or fourth clutch. If the
pressure differential between line and any of these clutch circuits is more than 10 psi (assuming your oil pressure gages are
accurate) there is a possible oil leak in that clutch oil circuit.
I.Diagnosis Procedure For A Slipping 1-2 or No 1-2 Shift
Step 1
After verifying the condition, remove and disassemble the 2-4 servo cover and piston assembly. Check the following:
a)
Proper servo pin length.
b)
Damaged or worn seals. Replace if necessary.
c)
Porosity, nicks, burrs, sharp edges, or ring groove damage in the pistons, cover, servo pin, or servo bore.
FIGURE 1 - SERVO EXHAUST HOLE
