Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Oxygen Sensor: Technical Service Bulletins
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 NA
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
