30.
Remove mixture screws.
IMPORTANT: DO NOT use a wire or drill to clean
jets, passages, or tubes in carburetor, as this
may enlarge orifices and seriously affect carbu-
retor calibration.
a
3. Wipe all parts that cannot be cleaned in immer-
sion cleaner with a clean, dry cloth.
4.
Carefully inspect all carburetor parts for damage
or wear; pay particular attention to the following:
a. Idle mixture screws - Replace if damaged or
b
worn.
b. Fuel inlet needle valve and seat - Replace
70467
withnewneedleandseatifwornordamaged.
c. Casting surfaces - Inspect accelerator
pump plunger well for scoring or deposits.
Replace worn or corroded components.
a - Idle Mixture Screw
b - Spring, Idle Mixture Screw
d. All linkage rods and levers - Replace if
Cleaning and Inspection
worn or damaged.
e. Accelerator pump and plunger parts - Re-
place pump and parts if worn or damaged.
!
CAUTION
f.
Float assemblyandhingepin-Floatweight
of each should be the same. Replace either
if fuel can be heard inside when shaken.
Check hinge pin and holes for wear. Replace
components if worn or defective.
Rubber, plastic parts, pump plungers or dia-
phragms cannot be immersed in carburetor
cleaner.
!
CAUTION
g. Throttle valves and shafts - Check for bind-
ing (through entire operating range, making
sure valves open and close completely) or for
looseness in carburetor body.
Avoid damage to carburetor. Do not leave carbu-
retor in immersion-type cleaner for more than
two hours.
IMPORTANT: DO NOT remove throttle valves. If
any of the throttle parts or float bowl/carburetor
body shaft bores are found to be worn or dam-
aged, carburetor replacement is required.
IMPORTANT: Do not immerse metering rod
springs in carburetor cleaner; the color, if not
“natural” metal, may be removed. Clean
separately as needed.
h. Choke valve and shaft/lever assembly -
Check shaft and lever for excessive loose-
ness in air horn. Check choke valve and
shaft/lever assembly for binding through en-
tire operating range. Air horn assembly must
be replaced if choke valve and shaft/lever are
worn.
1.
Clean metal carburetor parts in a commercial, im-
mersion-type cleaner, until all deposits have
been removed. Follow manufacturer’s instruc-
tions of cleaner being used for proper cleaning
and rinsing procedures.
!
CAUTION
5.
Check that choke pull-off diaphragm plunger re-
tracts when vacuum is applied to unit, and that it
holds vacuum (plunger remainsseatedifvacuum
is maintained).
Avoid personal injury. Always wear safety
glasses when using compressed air.
2.
Blow out passages with compressed air. Do not
drill through passages.
Index
5B-34 - WEBER 4 BARREL CARBURETOR
90-823224--2 796
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
Thank you