MerCruiser 350 MAG MPI Owner's Manual

90-864197070 JUNE 2007 Page iii
Serpentine Drive Belt.............................................73
Checking...........................................................73
Replacing Belt and/or Adjusting Tension..........74
Flushing The Power Package—Tow Sports..........75
The Boat Out of the Water................................75
The Boat In the Water.......................................77
Battery...................................................................79
Multiple EFI Engine Battery Precautions........79
Section 6 - Storage
Cold Weather or Extended Storage.......................82
Preparing Power Package for Storage...........82
Engine and Fuel System Preparation..........83
Draining the Seawater System..............................84
Drain System Identification.............................84
Air Actuated Single Point Drain System.......84
Manual Single Point Drain System...............85
Three Point Manual Drain System...............85
Multi‑Point Drain (MPD) System..................86
Air Actuated Single Point Drain System.........86
Boat in the Water.........................................86
Boat out of the Water...................................89
Manual Single Point Drain System.................91
Boat in the Water.........................................91
Boat out of the Water...................................92
Three Point Manual Drain System.................93
Boat in the Water.........................................93
Boat out of the Water...................................94
Multi‑Point Drain (MPD) System....................95
Boat out of the Water...................................95
Boat in the Water.........................................97
Battery Storage......................................................99
Power Package Recommissioning........................99
Section 7 - Troubleshooting
Diagnosing EFI Problems....................................102
Diagnosing DTS Problems..................................102
Engine Guardian System.....................................102
Starter Motor Will Not Crank Engine, Or Cranks
Slow.....................................................................102
Engine Will Not Start Or Is Hard To Start............102
Engine Runs Rough, Misses And/Or Backfires...103
Poor Performance...............................................103
Excessive Engine Temperature...........................103
Insufficient Engine Temperature..........................104
Low Engine Oil Pressure.....................................104
Battery Will Not Come Up On Charge.................104
Remote Control Operates Hard, Binds, Has
Excessive Free‑play Or Makes Unusual Sounds 104
Steering Wheel Turns Hard Or Jerky..................104
Section 8 - Customer Assistance Information
Owner Service Assistance...................................106
Local Repair Service.......................................106
Service Away From Home..............................106
Stolen Power Package...................................106
Attention Required After Submersion.............106
Replacement Service Parts............................106
Parts And Accessories Inquiries................107
Resolving A Problem......................................107
Mercury Marine Service Offices......................107
Ordering Literature..............................................108
United States and Canada..............................108
Outside The United States and Canada.........108

MerCruiser 350 MAG MPI Specifications

General

Engine Type	V8
Horsepower	300 HP
Ignition System	Electronic ignition
Alternator	65 amp
Compression Ratio	9.4:1
Displacement	5.7L (350 cu in)
Fuel System	Multi-Point Injection (MPI)
Bore x Stroke	4.00" x 3.48" (101.6mm x 88.39mm)