FLUID LEAKING FROM TRANS VENT (DIAGNOSTIC TIPS/SERVICE INFO)

Subject: FLUID OUT VENT - DIAGNOSTIC TIPS

Model and Year: 1982-90 C1/C2, K1/K2, G1/G2, R1/R2, V1/V2 WITH 3L80/3L80HD AUTOMATIC TRANSMISSION

TRANSMISSION APPLICATIONS: SUBJECT: 1982-1990 HYDRA-MATIC 3L80/3L80-HD Fluid Out Vent - Diagnostic Tips (M-40) (Service Information)

TRANSMISSION MODELS: VEHICLE APPLICATIONS: All Models C/K, RN, and P-Trucks G-VAN

Service Information:

Some diagnostic information to consider if fluid is leaking out the vent:

o Inverted pump gasket or pump gasket off location - Use alignment pins.

o Flatness specification of Pump Body and Cover - Free from burrs.

o Pump passages clear from chips - Visual inspection.

o Overfilled transmission - fluid - Check fluid level at transmission operation temperature.

Pressure Regulator Pin hole too shallow causing pump face interference.

Service Manual Reference:

Refer to the appropriate Service Manual Section for proper repair procedures.

Refer to Dealer Service Bulletin No. 90-406-7A for a new fluid level indicator and model application.

Labor Operation K6130 Time alloted - 0.2 hours

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.