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Picture

LINCOLN-MERCURY

CARBURETOR MODEL 2140

TROUBLE SHOOTING CHART

TROUBLE

POSSIBLE CAUSE

SYSTEM

Poor Fuel Economy

High Speed or Full Power Complaints.

Damaged or obstructed main well tubes.

Main Metering System

Damaged or obstructed air bleeds.

 

Damaged, distorted, or oversized main jets.

 

Damaged or obstructed idle tubes.

Idle System

Damaged or obstructed idle air bleeds.

 

Grooved or damaged idle adjusting needles.

 

Binding economizer diaphragm stem.

Power Enrichment Sys

Power valve broken or stuck open.

tem.

Split, broken, or distorted power valve gasket.

 

Obstructed manifold vacuum passage.

 

Incorrectly set accelerating pump link.

Accelerating Pump Sys

Damaged, corroded, or obstructed pump dis

tem.

charge needle or seat.

 

Incorrectly set or damaged choke.

Automatic Choke System

Damaged thermostatic spring.

 

Obstructed heat tube passage.

 

Damagedor distorted secondary jetgasket.

Secondary Throttle Sys

Loose secondary jet head nut.

tem.

High fuel level in float chamber because of

Fuel System

improperly set or damaged floats, damaged

 

or obstructed inlet needle valve, or excessive

 

fuel pump pressure.

 

Incorrectly set, damaged, or faulty dashpot.

Dashpot.

Damaged or obstructed main well tubes.

Main Metering System

Damaged or obstructed air bleeds.

 

Damaged, distorted, or undersized main jets.

 

Clogged or damaged power valve.

Power Enrichment Sys

 

tem

Damaged throttle operating diaphragm.

Secondary Throttle Sys

Obstructed primary bore vacuum restriction.

tem

Damaged or obstructed secondary jets or

 

venturi tubes.

 

Low fuel level in float chamber because of

Fuel System

improperly set or damaged floats, damaged

 

or obstructed inlet needle valve, or insuffi

 

cient fuel pump pressure.

 

-16


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