S15/T15 Jimmy 2WD L4-119 1.9L VIN A 2-BBL (1983)
Fluid Pump: Customer Interest
A/T - Vent Pipe Oil Leak
Number:
84-148
Section:
7A (VIIc)
Date:
June, 1984
Subject:
TRANSMISSION OIL EXHAUSTING OUT THE VENT PIPE
Model and Year:
ALL 1983 AND 1984 THM 200C
TO:
ALL CHEVROLET DEALERS
If a 1983 or 1984 THM 200c transmission exhibits oil exhausting out the vent pipe, possible causes may be due to out-of-flat conditions on the face,
nicked faces, porosity, or face damage on the pump body assembly or the oil pump cover assembly.
When servicing any 1983 or 1984 THM 200C transmission for transmission oil exhausting out the vent pipe, both the pump body assembly and the
pump cover assembly should be replaced. At the same time, a new pump to case gasket should also be installed. Replacement of these parts will prevent
transmission oil from exhausting out the vent pipe during harsh deceleration or during sharp turns.
The following part numbers can be used to service all these THM 200C transmissions.
PUMP BODY ASSEMBLY
Models
Order Service Part
BH, PS, CZ, JY,
OI, OR, OU
8638922
OIL PUMP COVER
Models
Order Service Part
CZ,
JY
8633956
OR,
OU
8633957
BH,
PS,
OI
8633958
PUMP TO CASE GASKET
Models
Order Service Part
BH, PS, CZ, JY,
OI, OR, OU
8633899
Refer to your service manual for disassembly and reassembly procedure.
