TROUBLESHOOTING
SERVICE MANUAL NUMBER 26
Ignition System Check(1 of 2)
1
•
•
IF A TACHOMETER IS CONNECTED TO THE TACH TERMINAL, DISCONNECT IT
BEFORE PROCEEDING WITH THE TEST.
CHECK SPARK AT PLUG WIRE USING AN INDUCTIVE PICKUP TIMING LIGHT
WHILE CRANKING. A FLASHING LIGHT INDICATES SPARK. (IF NO SPARK ON FIRST
WIRE, CHECK SECOND WIRE.) A FEW SPARKS AND THEN NOTHING
IS CONSIDERED NO SPARK.
NO SPARK
SPARK
•
DISCONNECT 4 TERMINAL CONNECTOR
ON DISTRIBUTOR AND CHECK FOR
SPARK.
1
A
CHECK FUEL, SPARK PLUGS, ETC.
SEE “TROUBLESHOOTING.”
SPARK
NO SPARK
•
CHECK FOR SPARK AT COIL WIRE WITH TIMING
LIGHT WHILE CRANKING. (LEAVE TIMING LIGHT
CONNECTED TO COIL WIRE FOR STEPS 3-6).
REPLACE MAGNETIC
SHAFT ASSEMBLY.
2
NO SPARK
SPARK
•
DISCONNECT DISTRIBUTOR 2 TERMINAL “C/+”
CONNECTOR.
IGNITION SWITCH “ON,” ENGINE STOPPED.
CHECK VOLTS AT “+” AND “C” TERMINALS OF
DISTRIBUTOR HARNESS CONNECTION.
INSPECT CAP FOR WATER,
CRACKS, ETC. IF OK,
REPLACE ROTOR.
3
•
•
UNDER 10 VOLTS
“C”TERMINAL ONLY
BOTH TERMINALS 10
VOLTS OR MORE
BOTH TERMINALS
UNDER 10 VOLTS
4
REPAIR WIRE FROM MOD-
ULE “+” TERMINAL TO “B” GROUND IN CKT. FROM
TERMINAL OF BLACK
IGNITION COIL CONNEC-
TOR OR PRIMARY CKT. TO
IGNITION SWITCH.
CHECK FOR OPEN OR
•
•
RECONNECT DISTRIBUTOR 2
TERMINAL CONNECTOR.
WITH IGNITION “ON,” CHECK VOLTAGE
FROM TACH. TERMINAL TO GROUND
“C” TERMINAL TO IGNI-
TION COIL. IF CKT IS OK,
FAULT IS IGNITION COIL
OR CONNECTION.
1
TO 10 VOLTS
OVER 10 VOLTS
UNDER 1 VOLT
REPLACE MODULE AND
CHECK FOR SPARK
FROM COIL AS IN STEP 6.
•
•
CONNECT TEST LIGHT FROM TACH.
TERMINAL TO GROUND.
CRANK ENGINE AND OBSERVE
LIGHT.
REPAIR OPEN
TACH. LEAD OR
CONNECTION AND
REPEAT TEST #4.
SPARK
NO
SPARK
REPLACE
IGNITION
COIL.
SYSTEM
OK
CHART CONTINUED
ON NEXT PAGE
a
b
Index
Page 1C-12
90-861329--1 MARCH 1999
| 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