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Twin Disc MG 514C Marine Transmission Parts - MG 514 Rebuilt Section

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Twin Disc MG514C Rebuilt Marine Transmissions — Complete Catalog & Buyer’s Guide

When you choose a rebuilt Twin Disc MG514C from Diesel Pro Power, you’re selecting a work-ready marine gearbox that’s been professionally remanufactured, precision-tested, and prepared for dependable service in commercial, industrial, and mission-critical vessels. This section organizes every in-stock MG514C and MG514CHP option by ratio and case style (Shallow or Deep), and it explains—in plain language—the real-world differences between 2.00:1, 3.00:1, 4.00:1, 4.50:1, 5.00:1, and 6.00:1 gear sets, so you can match your engine’s power curve to your propeller and duty profile with confidence. You’ll also find a quick overview of interface details like housing size (SAE #1) and companion components such as the ring drive, plus helpful guidance on selection, reliability, and ownership.

At a glance:
 • MG514C = standard heavy-duty family with Shallow or Deep case options.
 • MG514CHP = high-horsepower (HP) variants in Deep case for more demanding torque loads.
 • Ratios available = 2:1, 3:1 (Shallow case) and 4:1, 4.5:1, 5:1, 6:1 (Deep case).
 • All units are sold with a refundable core deposit and are fully tested prior to shipment.

Rebuilt & Spin-Tested

Every MG514C and MG514CHP listed here is professionally rebuilt and spin-tested prior to shipment for proper engagement and operation.

Core Deposit & Exchange

All units are sold with a refundable core deposit. Return a like-for-like rebuildable core to receive your refund; details are provided at checkout and with your order.

Case Styles & Variants

  • Shallow Case (2:1, 3:1) — compact footprint and higher shaft RPM suitability.

  • Deep Case (4:1, 4.5:1, 5:1, 6:1) — supports larger reductions and higher thrust applications.

  • MG514CHP (Deep Case, High Horsepower) — built for elevated torque inputs and demanding duty cycles.

Choosing a Reduction Ratio

  • 2:1 – Favors responsive handling and smaller prop diameters in tighter spaces.

  • 3:1 – Adds thrust and low-speed control while retaining a shallow case.

  • 4:1 – Workboat classic for bigger props and confident maneuvering.

  • 4.5:1 – Popular high-thrust choice for precise station-keeping.

  • 5:1 – Serious thrust for towing, trawling, and heavy resistance.

  • 6:1 – Maximum reduction for maximum bite and bollard pull.

Tip: Align ratio with your engine’s torque curve, hull resistance, and propeller sizing.

MG514C (Shallow Case) Rebuilt Options

Twin Disc MG514C 2.00:1 — Rebuilt (Shallow Case)

Compact installation, responsive throttle feel, and straightforward pairing with modest-diameter props. Suitable for mixed-use vessels that need agility with moderate loads.

Twin Disc MG514C 3.00:1 — Rebuilt (Shallow Case)

A step up in thrust and low-speed authority without changing to a deep case. A practical middle ground for crews facing current, chop, or tighter maneuvering spaces.

MG514C (Deep Case) Rebuilt Options

Twin Disc MG514C 4.00:1 — Rebuilt (Deep Case)

A proven work ratio for larger props and stronger thrust at lower shaft speeds. Favored in commercial fishing, push boats, and heavy utility craft.

Twin Disc MG514C 4.50:1 — Rebuilt (Deep Case)

Balances powerful low-speed control with efficient loading of the engine. Excellent for frequent maneuvering, station-keeping, and high-thrust tasks.

Twin Disc MG514C 5.00:1 — Rebuilt (Deep Case)

Built for sustained heavy duty—towing, trawling, and high-resistance hulls where reliable bite and control are essential.

Twin Disc MG514C 6.00:1 — Rebuilt (Deep Case)

Maximum reduction in this lineup for extreme thrust requirements and very low shaft RPM operation with large-diameter, high-pitch props.

MG514CHP (High Horsepower, Deep Case) Rebuilt Options

Twin Disc MG514CHP 4.50:1 — Rebuilt (Deep Case, High Horsepower)

For elevated torque inputs and demanding duty cycles requiring durable engagement characteristics over long shifts.

Twin Disc MG514CHP 5.00:1 — Rebuilt (Deep Case, High Horsepower)

A heavy-duty choice where consistent, high thrust and thermal stability are priorities in daily operations.

Twin Disc MG514CHP 6.00:1 — Rebuilt (Deep Case, High Horsepower)

For top-end reduction requirements with headroom to absorb torque spikes and persistent heavy loads.

Interface & Companion Component

Twin Disc MG514 Ring Drive (SAE #1)

The recommended interface for MG514 B/C installations with SAE #1 housing size. Confirm flywheel dimensions, pilot diameter, and bolt pattern for a clean, secure connection.

Selection Checklist

  • Engine model, rated RPM, and torque

  • Vessel type/displacement and duty profile (tow, trawl, push, utility)

  • Target prop diameter/pitch and tip clearance

  • Desired cruise speed vs. thrust bias

  • Cooling capacity and oil quality plan

Why Buy Your MG514C from Diesel Pro Power

  • Spin-Tested Gearboxes: Every unit is rebuilt and spin-tested prior to shipment.

  • Straightforward Core Exchange: Clear instructions and timely refunds on acceptable cores.

  • Knowledgeable Support: Help matching ratio, case style, and ring-drive fitment to your setup.

  • Global Shipping: Crated, preserved, and documented for smooth installation.

  • Trusted Supplier: Diesel Pro Power serves 40,000+ satisfied customers worldwide.

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