Detroit Diesel
Detroit Diesel 12V-149 Marine
149 Series
Detroit Diesel 12V-149 Marine discontinued legacy engine. Source-validated Detroit Diesel legacy model with ongoing owner, rebuild, marine, generator, and parts-search demand.
Overhaul & repair parts- Manufacturer files
- 1 datasheet
- Last updated
- 2026-08-04
- Package route
- diesel generator sets
- Cylinders
- V12
- Displacement
- 29.3 L
- Rated Speed
- 1,500 RPM
Ask about Detroit Diesel 12V-149 Marine
Choose parts / service or sourcing. Your message includes this model and page link.
Detroit Diesel 12V-149 Marine overhaul & repair parts
Already running a Detroit Diesel 12V-149 Marine? Start with the parts you need, then send your nameplate so we can help check the right references for your engine.
Start with engine identification
We do not have a reviewed public parts preview for this model yet. Send the engine details and tell us what needs repair.
Let’s identify the right parts.
The model is the starting point. Serial numbers and build configurations can change which parts fit.
- Take a clear photo of the engine nameplate.
- Tell us what needs repair or replacement.
- Send both in WhatsApp to start a fitment check.
Opens WhatsApp with 12V-149 Marine and your selected categories included. Attach your photos there.
Detroit Diesel 12V-149 Marine generator set context
The Detroit Diesel 12V-149 Marine is listed here as a diesel generator-drive engine for 50 Hz generator sets. Use this page to compare the published engine output, electrical kWe/kVA ratings, emissions level, datasheet availability, and neighboring models before specifying an alternator, controller, enclosure, voltage, and compliance package.
Also searched as
Technical Specifications
| Brand | Detroit Diesel |
| Model | 12V-149 Marine |
| Series | 149 Series |
| Configuration | V12, two-cycle marine diesel |
| Cylinders | 12 |
| Displacement | 29.3 L |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | Unregulated |
| Country of Origin | United States |
| Year Discontinued | 1999 |
Frequently asked questions
What fuel does the Detroit Diesel 12V-149 Marine use?
The Detroit Diesel 12V-149 Marine is a diesel generator-set engine.
What is the displacement and cylinder configuration of the 12V-149 Marine?
The Detroit Diesel 12V-149 Marine is a V12 (12-cylinder) engine with a displacement of 29.3 L.
Is the 12V-149 Marine still in production?
No — the Detroit Diesel 12V-149 Marine is discontinued (production ended around 1999). Its specifications and datasheets remain archived here for reference.
Are reference documents available for the 12V-149 Marine?
This page links reference documents for the Detroit Diesel 12V-149 Marine. Check each document's title, model coverage, revision and rating conditions before using it for selection.