Removing Seals From Idle Mixture Screws; Installing New Seals; Carburetor Installation - Mercury 305 CID Service Manual

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Removing Seals From

Idle Mixture Screws

Avoid fire or explosion. Using a cutting wheel to

cut the seals will cause sparks, which will ignite

any fuel that is present. Ensure that there is no

fuel present and that carburetor is removed from

engine prior to cutting the seals from the carbu-

retor idle mixture screws.

1. Remove carburetor from the engine.

2. Drain all fuel from the carburetor.

3. Using a cutting wheel, make a cut on both sides

of the seal casing. Using a suitable device, pry

the plug from the inside of the seal. Once the plug

is removed, the idle mixture screw can be re-

moved and the seal casing can be removed.

1. Install new seal cup, spring and idle mixture

IMPORTANT: Do not install the seal plug until the

"Propane Assisted Idle Mixture Adjustment" pro-

cedure has been completed.

90-823225--1 1096

2. Align the opening in the plug with the tab on the

cup and push down until it snaps in place.

a - Opening in Plug

b - Tab on Cup

NOTE: The adapter plate is not used on the 4.3LX Al-

1. If adapter plate was removed, place the gasket

that matches the outside edge of the intake man-

ifold surface between the intake manifold and the

plate. Install carburetor adapter plate. Secure

with the allen-head screws. Torque to 132 lb. in.

(15 N m). Apply Loctite 271 to threads and install

a - Adapter Plate (Not on 4.3LX Alpha Model)

BOS / SAV EMISSIONS - 5F-9

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