MERCARB 2 BARREL CARBURETOR - 5B - 19
90-816462 2-695
Cleaning and Inspection
IMPORTANT: DO NOT use a wire or drill to clean
jet passages or tubes in carburetor, as this may
enlarge orifices and seriously affect carburetor
calibration.
!
CAUTION
To avoid damage to carburetor DO NOT leave car-
buretor in immersion type carburetor cleaner for
more than two hours.
IMPORTANT: DO NOT clean float bowl gasket sur-
faces with a gasket scraper or knife, as sealing
bead will be damaged and float bowl replacement
will be necessary.
!
CAUTION
The float assembly, float needle, accelerator
pump plunger, and fuel filter MUST NOT BE im-
mersed in carburetor cleaner, as they will swell,
harden, and/or distort
.
72410
b
c
d
a
a - Accelerator Pump Plunger
b - Float Needle
c - Fuel Filter
d - Float Assembly
!
WARNING
Avoid personal injury by always wearing safety
goggles when using compressed air.
1. Thoroughly clean all metal parts in a commercial
carburetor cleaner, until all deposits have been
removed. Follow cleaner manufacturer’s instruc-
tions for proper cleaning and rinsing procedure.
Dry parts with compressed air.
2. Using compressed air, blow out all passages in
carburetor to remove any foreign material.
3. Wipe off all parts that cannot be cleaned in carbu-
retor cleaner with a clean, dry cloth.
4. Carefully inspect all carburetor parts for wear and
damage; pay particular attention to the following:
a. Float Needle and Seat: If float needle or seat
is worn or damaged, replace with new needle
and seat assembly.
IMPORTANT: Float needle and seat are factory
matched and tested and should be replaced as a
set only.
b. Float Assembly and Hinge Pin: Check float
density (to see if it is saturated with fuel) by
comparing weight of float with specifications.
If weight is high, float assembly must be re-
placed. Check hinge pin and holes for wear.
c. Fuel and Air Passages: Passages must be
perfectly clean for proper carburetor opera-
tion.
d. Accelerator Pump Plunger and Return
Spring: Inspect pump plunger cup, pump
plunger spring (on pump assembly) and re-
turn spring.
e. Power Piston Spring: Check power piston
spring for weakness or distortion.
f.
Idle Mixture Needle: Inspect idle mixture
needle. If damaged, needle must be re-
placed.
g. Levers and Linkages: Check levers, links
and rods for wear.
h. Throttle Valve and Shaft: Check throttle
shaft for excessive looseness in throttle body.
Check throttle valve and shaft for binding
through entire operating range, making sure
valve opens and closes completely. Throttle
body assembly must be replaced if throttle
valve and shaft are worn or damaged.
i.
Choke Valve and Shaft and Lever Assem-
bly: Check shaft and lever assembly for ex-
cessive looseness in air horn assembly.
Check choke valve and shaft and lever as-
sembly for binding through entire operating
range, making sure valve opens and closes
completely. Air horn assembly must be re-
placed if choke valve and shaft and lever as-
sembly are worn or damaged.
j.
Inspect Casting for visible damage. Inspect
gasket surfaces. Inspect accelerator pump
plunger well for scoring or deposits.
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Страница 1: ...13 Printed in U S A 90 816462 2 695 1995 Brunswick Corporation GM 4 Cylinder MARINE ENGINES ...
Страница 2: ...90 816462 2 695 0 ...
Страница 7: ...1 A IMPORTANT INFORMATION GENERAL INFORMATION 72000 ...
Страница 15: ...1 B 50617 IMPORTANT INFORMATION MAINTENANCE ...
Страница 36: ...1 C IMPORTANT INFORMATION TROUBLESHOOTING ...
Страница 74: ...2 A 50633 REMOVAL AND INSTALLATION 4 CYL ALPHA ONE DRIVE ...
Страница 88: ...3 A 26790 ENGINE 181 CID 3 0L 4 CYLINDER GM ENGINE ...
Страница 137: ...4 A 72079 ELECTRICAL SYSTEMS STARTING SYSTEM ...
Страница 170: ...4 B 71855 ELECTRICAL SYSTEMS IGNITION SYSTEM ...
Страница 197: ...ELECTRICAL SYSTEMS CHARGING SYSTEM 4 C 72078 ...
Страница 237: ...4 D 72747 ELECTRICAL SYSTEMS INSTRUMENTATION ...
Страница 250: ...4 E 72938 ELECTRICAL SYSTEMS WIRING DIAGRAMS ...
Страница 264: ...5 A FUEL SYSTEM FUEL PUMP ...
Страница 271: ...5 B 72681 FUEL SYSTEM MERCARB 2 BARREL CARBURETOR ...
Страница 300: ...6 A 50628 COOLING SYSTEM SEAWATER COOLED MODELS ...
Страница 309: ...6 B 73665 COOLING SYSTEM CLOSED COOLING MODELS ...
Страница 325: ...C 6 EXHAUST SYSTEM MANIFOLD ...
Страница 331: ...7 A 71317 POWER STEERING PUMP ...