Mercruiser Marine Engine No. 17 GM V-8 305 CID (5.0L)/350 CID (5.7L) Service Manual (P/N 90-823225--1)
Mercury Models Covered & Key Technical Specifications
17 GM V-8 305 CID (5.0L)/350 CID (5.7L / Mercury Marine
Mercruiser Marine Engine 17 GM V-8 305 CID (5.0L): Year Range: 1997-2001
Mercruiser Marine Engine 17 GM V-8 350 CID (5.7L): Year Range: 1997-2002
MCM Alpha
Model, Serial Number And Model Year
5.0LÂOD832472 - OF601000¨1993 - 1995
5.0LXOD831003 - OF601000¨1993 - 1995
5.7L (4 Barrel)¨OD830700 - OF601000¨1993 - 1995
5.7L (2 Barrel)¨OF601000 and Above¨1996 Thru 1997
5.7LX¨OF601957 and Above¨1996 Thru 1997
5.7L EFI¨OF286830 and Above¨1996 Thru 1997
5.7LX EFI¨OF752400 and Above¨1996 Thru 1997
350 Magnum¨OD830982 and Above¨1996 Thru 1997
350 Magnum EFI Gen+¨OF800500 and Above¨1996 Thru 1997
MCM Bravo
Model ,Serial Number And Model Year
5.0LOD833077 - OF6014641993 - 1995
5.7L (4 Barrel)¨OD831826 - OF605335¨1993 - 1995
5.7L (2 Barrel)¨OF605336 and Above¨1996 Thru 1997
5.7LX¨OF601645 and Above¨1996 Thru 1997
5.7L EFI¨OF225560 and Above¨1996 Thru 1997
5.7LX EFI¨OF752408 and Above¨1996 Thru 1997
350 Magnum¨OD800300 and Above¨1996 Thru 1997
350 Magnum EFI Gen+¨OF800500 and Above¨1996 Thru 1997
350 Magnum EFI/MP¨OF289431 - OF601999¨1995
350 Magnum MPI Gen+¨OF602000 and Above¨1996 Thru 1997
MIE Ski
-
Model A
-
Model B
-
Model C
5.7L Competition (4 Barrel) ¨OD840220 - OF775199 ¨1993 - 1995
5.7L Competition (2 Barrel) ¨OF775200 and Above ¨1996 Thru 1997
350 Magnum Tournanment Ski ¨OD840100 and Above ¨1993 Thru 1997
350 Magnum EFI Tournament Ski ¨OF225157 - OK000000 ¨1994 - 1996
350 Magnum EFI Gen+Tournament Ski¨OK040006 and Above¨1997
350 Magnum EFI/MP Tournament Ski¨OF350583 - OF745536 ¨1995
350 Magnum MPI Tournament Ski ¨OF745537 - OK000000 ¨1996
350 Magnum MPI Gen+Tournament Ski (Black Scorpion) ¨OF800000 and Above¨1996
MIE Inboard
Model ,Serial Number And Model Year
5.7L¨ OD84000 and Above ¨1993 Thru 1997
5.7L EFI Gen+ ¨OK040300 and Above 1997
Mercury Manual Features & Content Preview
This factory-level reference (Book 1 of 2) covers Sections 1 through 4 for MerCruiser GM V-8 5.0L (305 CID) and 5.7L (350 CID) marine engines. It skips the generic filler and gets straight to the hard data required for engine removal, mechanical diagnostics, and electrical troubleshooting. Marine engine work requires strict attention to detail. Always verify the load rating of your hoist and ensure battery banks are completely disconnected before beginning any heavy mechanical procedures.
Model & Serial Number Coverage
Matching your exact serial number is critical for ordering parts and setting baselines. This volume covers:
- MCM Alpha: 5.0L (OD832472–OF601000); 5.0LX (OD831003–OF601000) for 1993–1995 model years
- MCM Alpha: 5.7L 4-bbl (OD830700–OF601000); 5.7L 2-bbl (OF601000 and above)
- Alpha EFI / LX EFI: Specific serial breakpoints including OF286830+, OF752400+, and OF601957+
- MCM Bravo: 5.0L (OD833077–OF601464) for 1993–1995, plus 5.7L, EFI, and LX EFI models with specific thresholds
- 350 Magnum / 350 Magnum EFI: Variants with defined "and above" boundaries (including Gen+ models)
- Ski / Inboard: Enumerated ranges covering dedicated serial blocks and production years
Manual Contents (Sections 1–4)
The layout is straightforward. You get four main sections dedicated to the mechanical and electrical foundations of the engine.
- Important Information: General specifications, standard maintenance routines, and torque references.
- Removal & Installation: Step-by-step routing for Alpha and Bravo drives, plus inboard transmission pairings.
- Engine: Complete mechanical teardown and assembly data for the 305 and 350 blocks.
- Electrical Systems & Wiring: You will not find a blended, confusing chapter here. Starting, ignition, charging, and instrumentation are split into their own sections. It also features dedicated wiring diagrams, giving you the exact schematics needed to trace faults across different harnesses.
Key Engine Specifications & Tune-Up Data
You need accurate numbers to set an engine up right. The tune-up tables map out idle ranges, W.O.T. RPM bands by model, firing orders for both standard and reverse rotation (LH/RH), plug gaps, base timing, and thermostat ratings.
| Specification Category | 5.0L (305 CID) | 5.7L (350 CID) |
|---|---|---|
| Bore × Stroke | 3.74 × 3.48 in (95 × 88.4 mm) | 4.00 × 3.48 in (101.6 × 88.4 mm) |
| Compression Pressure | 150 psi (1034 kPa) | 150 psi (1034 kPa) |
| Oil Pressure (@ 2000 RPM) | 30–60 psi (207–414 kPa) | 30–60 psi (207–414 kPa) |
| Fuel Pump Pressure (@ 1800 RPM) | 3–7 psi (21–48 kPa) | 3–7 psi (21–48 kPa) |
| Crankcase Oil (with filter) | 5.5 qt (5.2 L) | 5.5 qt (5.2 L) |
| Electrical System | 12V Negative (–) Ground | 12V Negative (–) Ground |
Fluid Capacities (Cooling & Drivetrain)
Beyond standard crankcase oil volumes, the manual breaks down exact capacities for seawater and closed-cooling systems. It clearly separates entries based on exhaust-manifold flow routing. Transmission capacities for typical inboard pairings, including Velvet Drive ratios and Hurth down-angle setups, are laid out in quick-reference format.
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