Mercury Mercruiser Marine Engine Number 23, GM V-8 454 CID (7.4L)/502 CID (8.2L) service manual
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Models Covered & Key Technical Specifications
Mercury Mercruiser Marine Engine Number 23
- GM V-8 454 CID (7.4L)
- GM V-8 502 CID (8.2L)
- 454 Magnum MPI Bravo (Serial numbers: 0L010029 and up)
- 502 Magnum MPI Bravo (Serial numbers: 0L017000 and up)
- Gen. VI Engines
Sterndrive (MCM) Model and Serial Number
- MCM 454 Mag MPI 0L010029 and up
- MCM 502 Mag MPI 0L017000 and up
- Inboard (MIE) Model and Serial Number
- MIE 454 Mag MPI Horizon 0L002200 and up
- MIE 8.2L MPI 0L002450 and up
- L-29 Engines
- Sterndrive (MCM) Model and Serial Number
- MCM 7.4L MPI 0L010003 and up
- Inboard (MIE) Model and Serial Number
- MIE 7.4L MPI 0L002006 and up
Serial Numbers:
- 7.4L engines: 0F000750 and up
- 8.2L engines: 0C878221 and up
Professional Workshop Service Manual & Technical Specifications
MerCruiser GM V8 454 (7.4L) / 502 (8.2L) — Service Manual No. 23 (Book 1 of 2, 90-861326--1, March 1999)
Service Manual No. 23 is a serial-gated reference set for MerCruiser 454 cid (7.4L) and 502 cid (8.2L) GM V8 packages. Book 1 covers the core backbone (Sections 1–4) and front-loads the fit signals: exact model names, minimum serial thresholds, and the system split across engine and electrical architecture.
Models & Serial Thresholds Listed
Coverage is grouped by engine generation and installation type:
- Gen. VI: MCM 454 Mag MPI (0L010029 & up), MCM 502 Mag MPI (0L017000 & up)
Inboard equivalents: MIE 454 Mag MPI Horizon (0L002200 & up), MIE 8.2L MPI (0L002450 & up) - L-29: MCM 7.4L MPI (0L010003 & up), MIE 7.4L MPI (0L002006 & up)
What Book 1 Contains (Sections 1–4)
The section ladder is clearly defined:
- Important Information (general data + maintenance reference pages)
- Removal & Installation routing (MCM Bravo/Blackhawk and MIE Velvet Drive / Hurth transmission pairings)
- Engine (454/502 technical content)
- Electrical System (starting, ignition, charging, instrumentation, plus wiring diagrams)
Edition cues & reference markers
- Publication: 90-861326--1 (Manual No. 23), printed March 1999
- Book format: Book 1 of 2, covering Sections 1–4
- Engine families named on the cover: 454 cid (7.4L) and 502 cid (8.2L)
- Model naming includes both MCM (sterndrive) and MIE (inboard) groupings
- Electrical is split into Starting / Ignition / Charging / Instrumentation with a dedicated Wiring Diagrams subsection
- Fluid-capacity tables are provided in U.S. quarts (liters) with separate cooling-system entries
Compact technical table
| Spec anchor | 454 (7.4L) / 502 (8.2L) values |
|---|---|
| Bore × stroke | 454: 4.25 × 4.00 in (108 × 101.6 mm) • 502: 4.47 × 4.00 in (113.5 × 101.6 mm) |
| Fuel pressure (running) | 43 psi (248 kPa) |
| Oil pressure @ 2000 rpm | ≥30 psi (207 kPa) |
| Crankcase oil (with filter) | 7 qt (6.6 L) |
| Cooling system capacity | Seawater: 20 qt (19 L) • Closed cooling: 18 qt (17 L) |
| Sterndrive gear lube (with monitor) | Bravo One 88 fl oz • Bravo Two 104 fl oz • Bravo Three 96 fl oz • Blackhawk 80 fl oz |
Engine baseline references (quick scan)
A consolidated tune-up/spec block lists compression ratio targets by model, idle rpm (in-gear), W.O.T. rpm bands, minimum compression pressure, minimum battery requirement, firing order, plug families and plug gap, base timing reference, and thermostat rating—useful when comparing a 454 Mag MPI vs 502 Mag MPI package without switching sections.
Electrical + drivetrain context in one place
Book 1 doesn’t isolate engine data from the rest of the power package: electrical sections are paired with wiring diagrams, and the maintenance tables include transmission and drive-unit fluid capacities (Velvet Drive / Hurth / Walter V-drive listings plus Bravo/Blackhawk gear-lube volumes). That combination helps when the deciding factor is “does the book cover my installation type and its supporting systems,” not just the long block.
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