SERVICE MANUAL NUMBER 23
IGNITION SYSTEM
INSTALLATION
1.
2.
Install coil bracket with coil to engine bracket using fasteners.
Connect high tension coil lead.
b
a
72921
a - Wire Harness Connection
b - High Tension Coil Lead Connection
3.
Connect wire harness connectors.
Ignition Timing
Checking/Adjusting
The engine must be at NORMAL OPERATING TEMPERATURE for this adjustment. Two
items of test equipment are required: an inductive pickup timing light and either a Scan Tool,
Diagnostic Code Tool, or MerCruiser Special Timing Tool (91-805747A1).
1.
2.
Connect timing light to number 1 ignition wire.
Connect the appropriate tool to the DLC connector of the wiring harness.
NOTE: The 7.4L MPI will automatically adjust engine to approximately 1200 - 1500 rpm
when put in the service or timing mode.
3.
4.
Manually adjust the engine throttle to 1800 rpm + 200.
If Not Using MerCruiser Timing Tool: With engine running, set the scan tool or Diag-
nostic Code Tool to service mode.
5.
Shine the timing light at the timing mark indicator located on the timing chain cover.
a
72328
a - Timing Marks
NOTE: If adjustment is needed, loosen the distributor hold-down bolt and rotate the
distributor clockwise or counterclockwise to adjust the timing. Then repeat the timing light
check until the specification (8 degrees BTDC) is met.
6.
7.
Torque distributor hold-down bolt to 30 lb-ft (40 Nm).
Set Scan Tool or Diagnostic Code Tool to normal mode. If using the MerCruiser Special
Timing Tool, disconnect it from DLC connector.
8.
Manually close throttle to bring engine down to idle state.
Index
90-861326--1
MARCH 1999
Page 4B-13
| 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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Marine readers have rated Mercury MerCruiser GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23 5.0 out of 5.0 based on 1 product reviews. Just need the manual. Wrote review. Can't technically review what I haven't seen yet...