Lynx L4-116 1.9L VIN J FI HP (1986)
Vacuum Brake Booster: All Technical Service Bulletins
Brakes - Loss Of Vacuum Assist
Article No. 86-16-9
BRAKE - POWER - INTERMITTENT LOSS OF VACUUM ASSIST DURING COLD WEATHER - 1.9L 2V
FORD 1985-86 ESCORT, EXP
LINCOLN-MERCURY 1985-86 LYNX
CALIBRATION: 1.9L 2V
WARNING:
This modification is authorized only for the listed engines. Performing this modification on other engine calibrations is unauthorized and
could create liability under applicable federal or local laws.
Accumulation of water condensation in the engine vacuum system and/or brake booster vacuum hose may freeze in cold ambients and may block the
vacuum signal to the brake booster.
This can be corrected by installing a new design intake manifold vacuum tree fitting and hose, using the following procedure:
1.
Remove lower vacuum cap from dash panel vacuum fitting tree to drain any accumulation of water condensation.
2.
Remove air cleaner assembly.
3.
Remove dashpot mounting bracket from carburetor (two mounting screws on the carburetor mounting flange facing toward the instrument panel).
4.
Remove the crankcase vent hose assembly from the air cleaner connector to the intake manifold vacuum tree.
5.
Remove remaining vacuum hoses from the intake manifold vacuum tree.
6.
Using diagonal cutters, snip off 1/4 inch diameter vacuum port from intake manifold vacuum tree to allow removal of fitting without interference
with coolant bypass hose. Remove and discard manifold vacuum fitting.
7.
Install replacement intake manifold vacuum tree:
E6FZ-9A474-E (MTX) E6FZ-9A474-C (MTX with A/C) E6FZ-9A474-F (ATX) E6FZ-9A474-G (ATX with A/C)
8.
Torque intake manifold vacuum tree to specification (7-12 ft.lbs. or 10-16 N-m). Maintain the original port alignment with the purge valve and
main vacuum system ports positioned approximately 10 degrees above horizontal.
