SERVICE MANUAL NUMBER 26
TROUBLESHOOTING
IMPORTANT INFORMATION
Section 1C - Troubleshooting
1
C
Table of Contents
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . 1C-2
Used Spark Plug Analysis . . . . . . . . . . . . . . 1C-3
Spark Plug Analysis . . . . . . . . . . . . . . . . . . . 1C-4
Normal Condition . . . . . . . . . . . . . . . . . . . 1C-4
Chipped Insulator . . . . . . . . . . . . . . . . . . . 1C-4
Wet Fouling (Oil Deposits) . . . . . . . . . . . 1C-4
Cold Fouling . . . . . . . . . . . . . . . . . . . . . . . 1C-5
Overheating . . . . . . . . . . . . . . . . . . . . . . . 1C-5
High Speed Glazing . . . . . . . . . . . . . . . . . 1C-5
Scavenger Deposits . . . . . . . . . . . . . . . . 1C-6
Pre-Ignition Damage . . . . . . . . . . . . . . . . 1C-6
Reversed Coil Polarity . . . . . . . . . . . . . . . 1C-6
Splashed Deposits . . . . . . . . . . . . . . . . . . 1C-7
Mechanical Damage . . . . . . . . . . . . . . . . 1C-7
Poor Boat Performance and/or Poor
Maneuverability . . . . . . . . . . . . . . . . . . . . . . 1C-8
Improper Full Throttle Engine RPM . . . . . . 1C-9
RPM Too High . . . . . . . . . . . . . . . . . . . . . 1C-9
RPM Too Low . . . . . . . . . . . . . . . . . . . . . . 1C-9
Engine Cranks Over But Will Not Start
Or Is Hard To Start . . . . . . . . . . . . . . . . . . 1C-10
Important Information . . . . . . . . . . . . . . 1C-10
EST Ignition System Check . . . . . . . . . . . . 1C-11
Test Description . . . . . . . . . . . . . . . . . . . 1C-11
Ignition System Check . . . . . . . . . . . . . 1C-12
Engine Will Not Crank Over/Starter
Engine Runs Poorly At Idle . . . . . . . . . . . . 1C-18
Engine Acceleration Is Poor . . . . . . . . . . . 1C-19
Engine Runs Poorly At High RPM . . . . . . 1C-19
Poor Fuel Economy . . . . . . . . . . . . . . . . . . 1C-20
Radio Noise . . . . . . . . . . . . . . . . . . . . . . . . . 1C-21
Troubleshooting With Vacuum Gauge . . . 1C-21
Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . 1C-21
Instrumentation Malfunction . . . . . . . . . . . 1C-22
Engine Noise . . . . . . . . . . . . . . . . . . . . . . . . 1C-22
Important Information . . . . . . . . . . . . . . 1C-22
Valve Cover Area . . . . . . . . . . . . . . . . . . 1C-23
Cylinder Area . . . . . . . . . . . . . . . . . . . . . 1C-23
Camshaft Area . . . . . . . . . . . . . . . . . . . . 1C-23
Crankshaft Area . . . . . . . . . . . . . . . . . . . 1C-24
Miscellaneous . . . . . . . . . . . . . . . . . . . . . 1C-25
Oil Pressure . . . . . . . . . . . . . . . . . . . . . . . . . 1C-26
Miscellaneous . . . . . . . . . . . . . . . . . . . . . 1C-26
Low Oil Pressure . . . . . . . . . . . . . . . . . . 1C-27
High Oil Pressure . . . . . . . . . . . . . . . . . . 1C-27
Excessive Oil Consumption . . . . . . . . . 1C-28
Water in Engine . . . . . . . . . . . . . . . . . . . . . . 1C-29
Important Information . . . . . . . . . . . . . . 1C-29
Water In Crankcase . . . . . . . . . . . . . . . . 1C-29
Water On Top Of Pistons . . . . . . . . . . . 1C-30
Engine Overheats . . . . . . . . . . . . . . . . . . . . 1C-31
Mechanical . . . . . . . . . . . . . . . . . . . . . . . 1C-31
Cooling System . . . . . . . . . . . . . . . . . . . 1C-32
Power Steering . . . . . . . . . . . . . . . . . . . . . . 1C-33
Poor, Erratic or No Assist . . . . . . . . . . . 1C-33
Noisy Pump . . . . . . . . . . . . . . . . . . . . . . . 1C-34
Fluid Leaks . . . . . . . . . . . . . . . . . . . . . . . 1C-34
Insufficient Water Flow From Alpha One
Inoperative . . . . . . . . . . . . . . . . . . . . . . . . . 1C-14
Charging System Inoperative . . . . . . . . . . 1C-14
Noisy Alternator . . . . . . . . . . . . . . . . . . . . . . 1C-15
Fuel System Rich . . . . . . . . . . . . . . . . . . . . 1C-15
Fuel System Lean . . . . . . . . . . . . . . . . . . . . 1C-16
Carburetor Malfunction . . . . . . . . . . . . . . . . 1C-16
Sterndrive Unit Seawater Pickup Pump 1C-35
Index
90-861329--1
MARCH 1999
Page 1C-1
Categories | Mercury MerCruiser Manuals |
---|---|
Tags | Mercury MerCruiser 181 CID |
Model Year | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
Download File |
|
Document File Type | |
Copyright | Attribution Non-commercial |
(6 votes, average: 5 out of 5) Marine readers have rated Mercury MerCruiser GM 4 Cylinder 181 cid 3.0L Marine Engines Service Manual Number 26 5.0 out of 5.0 based on 6 product reviews.
Thanks for sharing this material. Helps a lot after suffering with bad mechanics. spend too much money and nothing very good
great manual, makes impossible jobs possible. without a manual you can not do the job, a must have.
Great resource. Excellent information provided.
Need help to install automate choke
Need help to instal automate choke