SERVICE MANUAL NUMBER 23
MAINTENANCE
Ignition Timing
Two items of test equipment are required: an inductive pickup timing light and a Scan Tool.
1.
Connect timing light (91-99379 or similar) to No. 1 spark plug wire. Connect power
supply leads, if applicable, on light to 12 volt battery. Refer to Specifications - “Engine
Rotation and Firing Order,” for cylinder numbering and location.
2.
Connect a shop tachometer to engine.
NOTE: Before starting engine make sure the timing tab and mark, or marks, on crankshaft
damper are clean. Chalk or white paint on timing marks may help visibility.
NOTE: With engine running, set the scan tool or Marine Diagnostic Code Tool to the
SERVICE MODE and follow manufacturer’s instructions. On MEFI 2 and MEFI 3 models,
engine rpm will automatically increase to a higher rpm. You do not have to increase it
manually, as stated in the following steps.
3.
Connect the Scan Tool to the DLC connector (in the electrical box or on the electrical
bracket) of the wiring harness.
74228
a - Timing Tool
4.
5.
6.
Start the engine. Allow it to reach normal operating temperature.
On MEFI 1 Models: Manually adjust the engine throttle to 1800 rpm.
Aim timing light at timing tab, located on the timing gear cover and crankshaft torsional
damper. Check the timing. Refer to “Specifications.”
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7.
8.
9.
Loosen the distributor clamp bolt enough to just be able to rotate the distributor with
some resistance.
Aim timing light at timing tab and recheck location of timing mark. Slowly rotate the
distributor clockwise or counterclockwise to adjust the timing to specified degrees.
Aim timing light at timing tab and recheck location of timing mark. Repeat Step 8 until
timing is correct. Torque distributor hold down bolt to 30 lb-ft (40 Nm).
Index
90-861326--1
MARCH 1999
Page 1B-43
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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