EGO Sensors - Silicone Contamination

Article No.
93-23-6

11/10/93

^ EGO SENSORS - SILICONE CONTAMINATION

^ ENGINE - SEALANTS, LOW VOLATILITY SILICONE REQUIRED

^ EXHAUST SYSTEM - SILICONE CONTAMINATION OF EXHAUST GAS OXYGEN (EGO) SENSORS

FORD:
1984-86 LTD
1984-88 EXP
1984-94 CROWN VICTORIA, ESCORT, MUSTANG, TEMPO, THUNDERBIRD
1986-94 TAURUS
1988-93 FESTIVA
1989-94 PROBE
1994 ASPIRE

LINCOLN-MERCURY:
1984-86 CAPRI, MARQUIS
1984-87 LYNX
1984-92 MARK VII
1984-94 CONTINENTAL, COUGAR, GRAND MARQUIS, TOPAZ, TOWN CAR
1986-94 SABLE
1988-89 TRACER
1991-94 CAPRI, TRACER
1993-94 MARK VIII

MERKUR:
1985-89 XR4TI
1988-89 SCORPIO

LIGHT TRUCK:
1983-94 RANGER
1984-90 BRONCO II
1984-94 BRONCO, ECONOLINE, F-150-350 SERIES
1986-94 AEROSTAR
1988-94 F-47, F-53
1991-94 EXPLORER
1993-94 VILLAGER

This TSB article is being republished in its entirety to update model applicability and to revise the part number of the Low Volatility Sealant.

ISSUE:
EGO sensors can be contaminated if volatile types of silicone are used when servicing the engine. Volatile silicones can migrate throughout the system during the first one hundred hours of service. They are commonly found in liquid "silicone rubber" sealants and gasket material. These products are commonly sold in tubes and caulking-type cartridges.

ACTION:
When service is performed on the engine, only use new low volatility silicone sealant (F1AZ-19662-A) where specified. Also replace the contaminated EGO sensor if required.

CAUTION:
DO NOT SUBSTITUTE CONVENTIONAL SILICONE RUBBER SEALANTS WHEN LOW VOLATILITY SILICONE SEALANT IS SPECIFIED.

PART NUMBER PART NAME CLASS

F1AZ-19662-A Low Volatility RTV Sealant B

OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 89-14-5
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 403000, 490000, 499000