Mercury-MerCruiser GM V6 262 CID 4.3L Marine Engines Service Manual Number 25 Sections 1-3

Section 5B - Mercarb2 Barrel Carburetor
Identification . . . . . . . . . . . . . . . . . . . . . . . .
Replacement Parts Warning  . . . . . . . . . .
Precautions  . . . . . . . . . . . . . . . . . . . . . . . .
Torque Specifications  . . . . . . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . . . . . .
Tools  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exploded View . . . . . . . . . . . . . . . . . . . . . .
Important Service Information . . . . . . . . .
High Altitude Re-Jetting  . . . . . . . . . . .
5B-2
5B-3
5B-3
5B-3
5B-4
5B-4
5B-6
5B-8
5B-8
5B-9
5B-9
5B-9
5B-10
5B-10
Maintenance . . . . . . . . . . . . . . . . . . . . . . . .
Flame Arrestor  . . . . . . . . . . . . . . . . . . .
Fuel Inlet Filter  . . . . . . . . . . . . . . . . . . .
Choke Inspection  . . . . . . . . . . . . . . . . .
Adjustments  . . . . . . . . . . . . . . . . . . . . . . . .
Accelerator Rod  . . . . . . . . . . . . . . . . . .
Choke Setting . . . . . . . . . . . . . . . . . . . .
Choke Unloader  . . . . . . . . . . . . . . . . . .
Initial Idle Speed and Mixture . . . . . . .
Final Idle Speed and Mixture  . . . . . . .
Replacing Carburetor  . . . . . . . . . . . . . . . .
Repair  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal   . . . . . . . . . . . . . . . . . . . . . . . .
Disassembly  . . . . . . . . . . . . . . . . . . . . .
Cleaning and Inspection  . . . . . . . . . . .
Reassembly  . . . . . . . . . . . . . . . . . . . . .
Installation . . . . . . . . . . . . . . . . . . . . . . .
5B-11
5B-11
5B-13
5B-14
5B-14
5B-14
5B-16
5B-17
5B-17
5B-18
5B-18
5B-19
5B-19
5B-20
5B-28
5B-30
5B-40
8
Point Carburetor Check List  . . . . . .
Flooding At Idle RPM   . . . . . . . . . . . . .
Needle / Seat Change . . . . . . . . . . . . .
Adjustable Accelerator Pump Lever  .
Description  . . . . . . . . . . . . . . . . . . . . . . . . .
Section 5C - Weber 4 Barrel Carburetor
Identification . . . . . . . . . . . . . . . . . . . . . . . .
Carburetor Metering Rod
5C-2
Maintenance . . . . . . . . . . . . . . . . . . . . . . . .    5C-12
Flame Arrestor  . . . . . . . . . . . . . . . . . . .    5C-12
Fuel Inlet Filter  . . . . . . . . . . . . . . . . . . .    5C-13
Adjustments  . . . . . . . . . . . . . . . . . . . . . . . .    5C-14
Accelerator Pump   . . . . . . . . . . . . . . . .    5C-14
Float Drop  . . . . . . . . . . . . . . . . . . . . . . .    5C-16
Float Level . . . . . . . . . . . . . . . . . . . . . . .    5C-17
Electric Choke   . . . . . . . . . . . . . . . . . . .    5C-18
Idle Speed and Mixture . . . . . . . . . . . .  5C-18
Replacing Carburetor  . . . . . . . . . . . . . . . . 5C-19
Repair  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    5C-19
Removal   . . . . . . . . . . . . . . . . . . . . . . . .    5C-19
Disassembly . . . . . . . . . . . . . . . . . . . . . . . .    5C-21
Cleaning and Inspection . . . . . . . . . . . . . . 5C-32
Reassembly  . . . . . . . . . . . . . . . . . . . . . . . .    5C-33
Installation . . . . . . . . . . . . . . . . . . . . . . .    5C-44
And Jet Identification  . . . . . . . . . . . . .
Torque Specifications  . . . . . . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . . . . . .
Tools  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement Parts Warning  . . . . . . . . . .
Precautions  . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Delivery System  . . . . . . . . . . . . . . . .
Fuel Supply Connections  . . . . . . . . . .
5C-2
5C-4
5C-4
5C-5
5C-5
5C-6
5C-6
5C-6
5C-7
5C-8
8
Point Carburetor Check List . . . . . . . . .
Exploded View . . . . . . . . . . . . . . . . . . . . . .
Description  . . . . . . . . . . . . . . . . . . . . . . . . .    5C-10
Important Service Information . . . . . . . . .
Adjustable Accelerator Pump Lever  .
Hard Starting . . . . . . . . . . . . . . . . . . . . .
5C-11
5C-11
5C-11
Section 5D - Sav1 Emission Fuel System With Weber 4 Barrel
Carburetor
Identification . . . . . . . . . . . . . . . . . . . . . . . .
Replacement Parts Warning  . . . . . . . . . .
Torque Specifications  . . . . . . . . . . . . . . . .
Special Tools  . . . . . . . . . . . . . . . . . . . . . . .
Engine Specifications . . . . . . . . . . . . . . . .
Carburetor Specifications . . . . . . . . . . . . .
Carburetor Adjustment Specifications  . .
Description  . . . . . . . . . . . . . . . . . . . . . . . . .
Special Notes . . . . . . . . . . . . . . . . . . . . . . .
Carburetor Top Cover  . . . . . . . . . . . . .
Sealed Idle Mixture Screws  . . . . . . . .
Piston Bore of Emissions Model  . . . .
Precautions  . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance . . . . . . . . . . . . . . . . . . . . . . . .
Flame Arrestor  . . . . . . . . . . . . . . . . . . .
Fuel Filter   . . . . . . . . . . . . . . . . . . . . . . .
Positive Crankcase Ventilation (PCV)
5D-2
5D-2
5D-2
5D-2
5D-3
5D-3
5D-4
5D-4
5D-5
5D-5
5D-5
5D-6
5D-6
5D-7
5D-7
5D-7
5D-8
Troubleshooting . . . . . . . . . . . . . . . . . . . . .
Checking Ported Vacuum Switch and
Carburetor Vacuum Circuit
for Correct Operation  . . . . . . . . . . . . .
Service Procedures . . . . . . . . . . . . . . . . . .
Checking Positive Crankcase
Ventilation (PCV) Valve  . . . . . . . . . . .
Removing Seals From
Idle Mixture Screws  . . . . . . . . . . . . . .
Installing New Seals  . . . . . . . . . . . . . .  5D-12
Carburetor Installation . . . . . . . . . . . . .  5D-12
Ported Vacuum Switch Installation  . .    5D-13
Emissions System Connections  . . . .    5D-13
5D-8
5D-9
5D-11
5D-11
5D-11
Propane Assisted Idle Set Procedure
Test Equipment  . . . . . . . . . . . . . . . . . . . . .    5D-18
Emissions Testing  . . . . . . . . . . . . . . . . . . .    5D-19
5D-15
90-861328--1
NOVEMBER 1999
Page ix
Product Specification
CategoriesMercury MerCruiser Manuals
Tags,
Model Year1998, 1999, 2000, 2001
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Mercury-MerCruiser GM V6 262 CID 4.3L Marine Engines Service Manual Number 25 Sections 1-3 SKU UPC Model
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