SERVICE MANUAL NUMBER 24
MERCARB 2 BARREL CARBURETOR
Important Service Information
8
Point Carburetor Check List
To ensure that the carburetor is the cause of the problem, make the following checks BEFORE ordering
and installing a new carburetor. If questions 1, 2, 3, 5, 6 and 7 are YES and 8 is NO, the carburetor may
not be the problem.
1.
2.
3.
Does the choke close completely before starting?
Does the choke open completely during engine warm-up?
Is idle mixture screw set correctly?
Y
Y
Y
N
N
N
(Engines with Thunderbolt V ignition must have module locked in
Base Timing Mode).
4.
5.
6.
7.
What is the idle mixture screw setting?
Is the engine idle speed rpm correct?
Turn.
N
Y
Y
Is venturi cluster discharging fuel by 2000 rpm?
N
Is a good stream of fuel being discharged by both discharge holes
in venturi cluster when throttle lever is moved repeatedly while the
engine is off.
Y
Y
N
N
8.
Does the engine flood at idle?
Flooding At Idle RPM
If your engine floods at idle rpm, check the following:
1.
2.
3.
4.
Problem in ignition system causing engine to run rough.
Idle mixture screw adjusted incorrectly.
Bad needle and seat.
Incorrect float level or drop.
Needle / Seat Change
MerCarbs are factory equipped with a spring loaded needle. If the preceding steps did not
correct your problem, change to the solid type needle.
a
b
72290
Needle and Seat Assemblies
a - Spring Loaded Type Needle (Kit 3302-9029)
b - Solid Type Needle (Kit 3302-9407)
90-861327--1
OCTOBER 1999
Page 5B-7
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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