RTV Sealants - Use on Engines With Oxygen Sensors

NUMBER: 86-B-28

GROUP: 6 - Gasoline Engine

DATE: March, 1986
SUBJECT: RTV (AEROBIC SEALANTS) AND ANAEROBIC SEALANTS FOR ENGINES EQUIPPED WITH OXYGEN SENSORS

MODELS: 1981-86 C, K, G, S, T, M, AND CABALLEROS WITH YF5 CALIFORNIA EMISSIONS 1985-86 S, T, AND M WITH 2.5L EFI AND NA5 FEDERAL EMISSIONS 1985-86 CABALLEROS WITH 4.3L EFI AND NA5 FEDERAL EMISSIONS 1986 S, T, AND M WITH 2.8L, 4.3L EFI AND NA5 FEDERAL EMISSIONS

Incorrect usage of RTV sealants (cure in the presence of air) may cause damage to vehicle components such as oxygen sensors. This is caused by silica particles collecting on the oxygen sensor and contaminating the sensor. The correct application for RTV sealants is listed in the WDDGM parts book. The correct RTV sealants to use on engines in GMC Trucks are part numbers 1052914 or 1052917 (black) or part number 1052915 (clear). Red RTV sealant, part number 1052366, is for use on rear axle differential covers only, as it contains silica. Anaerobic sealers (cure without the presence of air) part numbers 1052756, 1052943, and 1052942 are also used to seal the rear main bearing cap to the block on engines used in GMC Trucks. See the chart below for a description of General Motors service approved RTV silicone and anaerobic sealers.

GENERAL MOTORS SERVICE APPROVED RTV SILICONE SEALANTS

Part Name Color Part Number Size Application

GMS (Type B) Black 1052914 300 ml. Caulker All Light
1052917 3 oz. Tube Duty Engines
Except 2.5L

GMS (Type A) Clear 1052915 300 ml. Caulker 2.5L 4 Cylinder

GMS Red 1052366 3 oz. Tube Rear Axle Usage Only

GENERAL MOTORS SERVICE APPROVED ANAEROBIC SEALANTS

Part Name Part Number Size Application

Loctite (R) Gasket Maker 1052942 6 ml. Engine Anaerobic Applications
1052943 50 ml.
1052756 6 ml.

Loctite (R) Transmission Case Cover 1052756 6 ml. Transmission Case Covers
Sealant

Loctite (R) Trim Bonding Adhesive 1052621 4 gm. Trim, Super Glue

Loctite (R) Pipe Sealant w/Teflon 1052080 50 ml. Pipe Sealant

Loctite (R) Thread Locking Kit 1052624 10 ml. Thread Locking, Retaining
Compound

Loctite (R) Inside Mirror Adhesive Kit 1052369 0.4 cc. Inside Rear View Mirror
GENERAL MOTORS OTHER APPROVED SEALANTS

Part Name Part Number Application

Gasket Sealing Compound 1050026 Gasket Sealing

Adhesive Caulking Kit 9636067 Windshield, Back Glass, Anywhere
Urethane Based Sealer Is Required