SERVICE MANUAL NUMBER 26
IGNITION SYSTEM
Cleaning And Inspection
Spark Plugs
1.
2.
Inspect each plug individually for badly worn electrodes, glazed, broken or blistered
porcelain and replace plug where necessary.
Inspect each spark plug for manufacturer and heat range. All plugs must be the same
manufacturer and number or heat range. Refer to “Specifications” for spark plug num-
bers.
3.
Check spark plug gaps with a round feeler gauge. Adjust if necessary.
e
a
f
b
c
d
50674
Spark Plug Detail
a - Porcelain Insulator
b - Check For Cracks In This Area of Porcelain
c - Shell
d - Proper Gap
e - Side Electrode (Gap Adjustment)
f - Center Electrode (File Flat When Adjusting Gap)
IMPORTANT: Tapered seat spark plugs are not interchangeable with non-tapered
(with gasket) spark plugs.
4.
Clean spark plug seating area. DO NOT use gaskets on taper seat plugs. Install spark
plugs and torque to 22 lb-ft (30 Nm). Heat transfer and a gas-tight seal must be achieved.
Spark Plug Wires
1.
2.
3.
4.
5.
Inspect spark plug wires for damage.
Check spark plug wires for continuity.
Replace any wires that are cracked, cut or have damaged spark plug boots.
Replace any wires that do not show continuity from end to end.
Reinstall spark plug wires in proper order.
IMPORTANT: Proper positioning in spark plug wires is important to prevent cross
firing.
Index
90-861329--1
MARCH 1999
Page 4B-7
| 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)
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Great resource. Excellent information provided.
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