Thunderbolt IV Ignition
Timing
5. Adjust timing by loosening distributor clamp and
rotating distributor body as required until timing
mark on damper or pulley lines up with the mark
on tab specified in “Specifications.” Tighten
clamp and recheck location of timing mark.
1.
Connect timing light (91-99379 or similar) to No.
spark plug. Connect power supply leads on
1
light to 12 volt battery. Refer to “Specifications”
for cylinder numbering and location.
6. Stop engine and remove timing light.
2.
3.
4.
Connect tachometer to engine.
Start engine and run at normal idle speed.
Aim timing light at timing tab, located on timing
gear cover and crankshaft torsional damper.
IMPORTANT: GM engine timing marks (on tab)
are in 2-degree increments. MCM and MIE LH en-
gines will have “A” (Advance) mark to the left of
“0.”
Timing must be set on the “A” side of “0”
(Top Dead Center).
a
b
72328
72851
a - Degree Marks
b - Timing Mark
Index
90-823224--2 796
IGNITION SYSTEM - 4B-13
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
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