Engine Runs Poorly At High RPM
Cause
Also refer to “Poor Boat Performance”
Crankcase overfilled with oil
Anti-siphon valve (if equipped)
Plugged fuel tank vent
Special Information
Check oil level with boat at rest in the water.
Restricting fuel supply
Fuel supply
Refer to “Carburetor Malfunctions”
(See “Table of Contents”)
Ignition timing
Low grade of fuel or water in the fuel
Spark plugs
Fouled, burned, cracked porcelain, incorrect
heat range
Spark plug wires
Distributor cap or rotor
Coil
Poor insulation, broken wires
Dirty or cracked
Distributor
Excessive play in shaft
Engine overheating
Low compression
Restricted exhaust
Refer to “Engine Overheats”
Worn valves, rings, cylinders, etc.
Index
1C-16 - TROUBLESHOOTING
90-823224--2 796
| 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.
Thank you