Mercruiser Marine Engine No. 17 GM V-8 305 CID (5.0L)/350 CID (5.7L) service manual

MerCruiser GM V-8 5.0L (305 CID) / 5.7L (350 CID) — Marine Engine Service Manual (Book 1 of 2, 90-823225--1)

This manual is a spec-dense reference set for MerCruiser GM V-8 marine engines in the 5.0L (305 CID) and 5.7L (350 CID) families, packaged as Book 1 of 2 and covering Sections 1–4 (information, removal/installation routing, engine, and electrical systems). It’s built around model/serial applicability tables, numeric tune-up baselines, and wiring-diagram coverage rather than a generic overview. :contentReference[oaicite:0]{index=0}

Coverage gates listed in the manual

• MCM Alpha: 5.0L OD832472–OF601000; 5.0LX OD831003–OF601000 (1993–1995)
• MCM Alpha: 5.7L (4-bbl) OD830700–OF601000; 5.7L (2-bbl) OF601000 and above
• Alpha EFI/LX EFI families list serial breakpoints such as OF286830+, OF752400+, and OF601957+
• MCM Bravo: 5.0L OD833077–OF601464 (1993–1995) plus 5.7L/EFI/LX EFI entries with serial thresholds
• 350 Magnum / 350 Magnum EFI variants appear with defined serial “and above” boundaries (including Gen+ entries)
• Inboard groupings (Ski/Inboard) are also enumerated with their own serial/year ranges :contentReference[oaicite:1]{index=1}

What’s inside Book 1 (Sections 1–4)

The manual’s outline shows four major blocks: Important Information (specifications/maintenance/general info), Removal & Installation (Alpha/Bravo variants plus inboard transmission pairings), Engine (5.0L/305 and 5.7L/350), and Electrical Systems (starting, ignition, charging, instrumentation, kits, and wiring diagrams). :contentReference[oaicite:2]{index=2}

Spec anchors pulled from the tune-up pages

The tune-up tables consolidate key numeric baselines across the 305/350 variants: bore/stroke geometry, compression ratio and compression pressure, idle range, W.O.T. rpm bands by model, oil-pressure windows, mechanical fuel-pump pressure range, electrical-system polarity, minimum battery requirements, firing order (including LH/RH rotation mapping), spark plug families, plug gap, base timing reference, and thermostat ratings. :contentReference[oaicite:3]{index=3}

Compact technical table

Fluid-capacity density (cooling and drivetrain context)

Beyond crankcase oil, the capacity pages list seawater and closed-cooling volumes (with separate entries depending on exhaust-manifold flow routing) and also include transmission capacities for common inboard pairings (Velvet Drive ratios and Hurth down-angle listings). The layout keeps these values grouped as quick-reference tables. :contentReference[oaicite:4]{index=4}

Electrical coverage signal: diagrams are a named subsection

Electrical Systems is not a single blended chapter: it’s partitioned into Starting, Ignition, Charging, Instrumentation, Electrical Kits, and a dedicated Wiring Diagrams subsection, which is a strong indic