Yanmar ZT370H Electro-Magnetic Shift Ratio 2.18 (Loose) ZT370H-E-218
Description
Geared for high displacement passenger tenders, Yanmar ZT370H Deep Ratio Sterndrive models drop diesel engine revs via a deep 2.18:1 gear ratio. The transmission manages 370 continuous horsepower at 3800 input RPM with wet hydraulic clutches. Thick aluminum casing walls protect rotating components from hull twist while maneuvering loaded passenger vessels through turbulent coastal channels.
High-strength ductile aluminum provides a rigid transmission framework that resists shaft deflection under continuous bollard push. Carburized helical gear sets ground to AGMA 11 standards isolate gear noise and prevent tooth scuffing under severe loads. Multi-plate sintered bronze clutch discs feature radial grooves that circulate cooling oil under pressure. Equipment interfaces include gimbal pivot yokes, electronic control harnesses, 3.2 quarts oil capacity, and 225 lbs dry weight.
Key Features of ZT370H-E-218
Commercial charter operators prefer to buy Yanmar ZT370H deep ratio sterndrive units when repowering passenger tour boats. The drivetrain supports continuous duty marine diesels working day and night in harsh navigational environments.
- A deep 2.18 to 1 reduction ratio yields high torque output to swing heavy dual propellers on loaded hulls.
- Wet clutch plates squeeze sintered bronze discs to lock drive shafts without slippage during heavy towing.
- High-tensile helical gear teeth handle 550 lb-ft continuous input torque with minimal gear wear.
- An electronic shift control valve regulates internal circuit oil pressure between 250 and 290 PSI.
- Counter-rotating dual propeller shafts eliminate steering torque to prevent driver fatigue on long shifts.
- Torsional rubber drive elements isolate diesel crankshaft vibration before it hits internal input shafts.
- Electro-deposition primers seal cast aluminum surfaces against aggressive underwater micro-biological attack.
Maximum Towing Hydraulic Boundaries
A built-in hydraulic gear pump feeds 280 PSI operating pressure, clamping multi-disc clutches tight against slippage under maximum diesel throttle. Continuous input torque reaches 550 lb-ft at 3800 engine RPM under commercial heavy duty vessel standards. Lubricant sump temperatures stay within 140°F to 175°F through conduction cooling into surrounding seawater. The 2.18:1 reduction ratio slows shaft revolutions, allowing commercial workboats to spin broad dual wheels that produce maximum bollard pull while pushing heavily loaded hulls.
Heavy Transom Gimbal Alignment
The upper drive steering yoke attaches into standard transom gimbal rings with precision ground pivot pins. An integrated heavy thrust bearing absorbs 22 kilonewtons of continuous forward prop thrust. Alignment technicians keep input shaft runout within 0.002 inches across the engine flywheel coupler.
Hydraulic Trim Service Schedule
Electronic shift signals actuate internal hydraulic spools to switch between forward, neutral, and reverse positions without delay. This heavy marine sterndrive is not intended for racing runabouts or light planing craft running gasoline powerplants above 4500 RPM. Preventive care follows precise running periods.
- Inspect transmission fluid levels on the header bottle each shift prior to operating the main diesel engine.
- Clean out the water intake grates and check sacrificial zinc anodes every 250 operational hours.
- Drain used lubricant from the drive leg down to empty and replace drive shaft bellows every 12 months.
Commercial Sterndrive Warranty Manifest
The builder provides a 2-Year limited warranty covering materials and machining against unexpected mechanical breakdown. Crated packages include the bare marine sterndrive leg, input universal joint drive shaft, propeller retention hardware, and comprehensive technical installation instructions.
Yanmar ZT370H Electro-Magnetic Shift 2.18 Sterndrive Product Overview
The Yanmar ZT370H Electro-Magnetic Shift Ratio 2.18 (Loose) ZT370H-E-218 is a specialized marine sterndrive transmission component engineered for compatible Yanmar ZT370H series propulsion systems.
In a sterndrive propulsion system, the marine gearbox and drive assembly transfer engine torque through the transmission to the propeller assembly. Correct reduction ratio selection, shift-control compatibility, engine matching, transom integration, steering setup, and propeller drive alignment are essential for proper marine installation.
This OEM Yanmar ZT370H electro-magnetic shift transmission is configured with a 2.18:1 reduction ratio and supplied in a loose configuration, making it suitable for scheduled maintenance replacement, sterndrive service, repower projects, refit work, or new installations where this specific Yanmar sterndrive configuration is required.
For customers searching for a Yanmar ZT370H electro-magnetic shift 2.18 sterndrive, Yanmar ZT370H-E-218, marine gearbox for sterndrives, or Yanmar sterndrive transmission component, this unit provides a fitment-focused solution for compatible ZT370H electro-magnetic shift applications.
Designed for Yanmar ZT370H Sterndrive Systems
The Yanmar ZT370H Electro-Magnetic Shift Ratio 2.18 is designed for compatible Yanmar ZT370H series sterndrive systems requiring an electro-magnetic shift interface.
ZT370H sterndrive installations require correct matching between the engine, reduction ratio, transmission unit, shift system, transom assembly, steering components, control interface, propeller drive, and vessel hull layout. This unit is intended for approved applications where a 2.18 ratio and electro-magnetic shift compatibility are specified.
Typical applications include:
- Yanmar ZT370H sterndrive installations
- Electro-magnetic shift sterndrive systems
- Marine gearbox replacement projects
- Sterndrive repower applications
- Scheduled maintenance replacement
- New installations requiring ZT370H 2.18 ratio fitment
Before purchase or installation, buyers should verify the sterndrive model, gear ratio requirement, electro-magnetic shift configuration, control compatibility, transom setup, engine compatibility, steering arrangement, and vessel installation details.
2.18:1 Reduction Ratio Configuration
The ZT370H-E-218 is configured with a 2.18:1 reduction ratio for compatible Yanmar ZT370H sterndrive propulsion systems.
The reduction ratio is a key specification because it helps match engine output to the propeller drive requirements of the vessel. Correct ratio matching supports proper drivetrain integration and helps ensure the sterndrive transmission unit is selected according to the intended marine application.
This 2.18 ratio configuration supports:
- Correct engine-to-propeller ratio matching
- Suitable torque transfer through the marine gearbox
- Compatible propeller drive operation
- Approved Yanmar ZT370H drivetrain layouts
- Replacement of existing compatible 2.18 ratio units
This unit should be selected only when the vessel and sterndrive configuration require the Yanmar ZT370H 2.18 electro-magnetic shift specification.
Electro-Magnetic Shift Control Compatibility
The Yanmar ZT370H-E-218 is designed for electro-magnetic shift applications.
Electro-magnetic shift systems use electromagnetic actuation for gear engagement within compatible marine propulsion control architectures. This configuration differs from traditional mechanical linkage systems and should be matched carefully to the vessels specified control setup.
This electro-magnetic shift configuration helps support:
- Electro-magnetic shift system compatibility
- Compatible marine control architecture integration
- Approved Yanmar ZT370H electro-magnetic shift layouts
- Direct fitment in specified sterndrive applications
- Proper control interface matching during replacement or repower work
Buyers should confirm that their vessel requires the electro-magnetic shift configuration before purchase.
Loose Sterndrive Transmission Configuration
The Yanmar ZT370H Electro-Magnetic Shift Ratio 2.18 (Loose) is supplied as a loose sterndrive transmission component for controlled installation or system integration.
A loose configuration is useful when replacing an existing transmission unit, preparing for a sterndrive repower, completing scheduled maintenance work, or assembling a marine propulsion system according to manufacturer specifications.
This configuration may support:
- Replacement of existing ZT370H 2.18 electro-magnetic shift units
- Sterndrive gearbox service work
- Marine repower project preparation
- Shipyard and workshop installation
- Component-level system integration
- New approved ZT370H sterndrive installations
The unit should always be installed with compatible Yanmar sterndrive components, controls, transom assemblies, mounting hardware, seals, steering components, and propeller equipment where required.
OEM Yanmar Marine Gearbox Component
The Yanmar ZT370H Electro-Magnetic Shift Ratio 2.18 ZT370H-E-218 is designed as an OEM Yanmar marine gearbox component for compatible sterndrive propulsion systems.
Using the correct OEM-style transmission component helps maintain proper integration between the Yanmar ZT370H sterndrive, engine setup, transom assembly, shift-control system, steering system, propeller drive, and vessel hull.
This unit is suitable for:
- Scheduled maintenance replacement
- ZT370H electro-magnetic shift gearbox replacement
- Sterndrive repower projects
- Marine refit applications
- New compatible propulsion installations
- OEM-style marine gearbox integration
Professional installation is recommended to ensure correct ratio matching, alignment, sealing, fastening, control setup, lubrication, steering checks, and final drivetrain verification.
Suitable for Sailboats and Powerboats
The Yanmar ZT370H Electro-Magnetic Shift Ratio 2.18 is suitable for compatible sailboats and powerboats using Yanmar ZT370H sterndrive systems with electro-magnetic shift compatibility.
Sterndrive propulsion systems are used in marine applications where the engine, marine gearbox, transom assembly, steering system, controls, and propeller drive must operate as a coordinated system. This unit provides the specified 2.18:1 ratio and electro-magnetic shift interface required for approved ZT370H installations.
For buyers searching for a marine gearbox for sterndrives, Yanmar marine gearbox replacement, Yanmar sterndrive transmission, or Yanmar ZT370H electro-magnetic shift gearbox, this component provides a direct fitment-focused solution for compatible marine propulsion layouts.
Replacement, Refit, and Repower Applications
The Yanmar ZT370H Electro-Magnetic Shift Ratio 2.18 (Loose) ZT370H-E-218 is suitable for replacement during scheduled maintenance, engine repower projects, refit work, or new installations where a compatible Yanmar sterndrive transmission with a 2.18 ratio and electro-magnetic shift interface is required.
During a sterndrive replacement or repower project, the transmission unit must match the drive model, reduction ratio, shift configuration, engine output, control setup, transom assembly, steering system, hull layout, and propeller requirements. Incorrect selection can affect control operation, propeller drive matching, drivetrain alignment, and system compatibility.
Buyers should confirm:
- Yanmar ZT370H sterndrive compatibility
- ZT370H-E-218 part reference
- 2.18:1 reduction ratio requirement
- Electro-magnetic shift control requirement
- Control system compatibility
- Transom assembly compatibility
- Engine and drive alignment
- Propeller and vessel application requirements
Correct specification matching helps support dependable marine propulsion system integration.
Installation and Compatibility Considerations
The Yanmar ZT370H Electro-Magnetic Shift Ratio 2.18 (Loose) should be installed according to manufacturer specifications and matched carefully with the vessels propulsion system.
Important considerations include sterndrive model, reduction ratio, shift interface, engine setup, control system compatibility, transom assembly fitment, hull transom geometry, steering components, mounting hardware, seal condition, lubrication requirements, propeller selection, and service access.
This component should be installed by qualified marine technicians familiar with Yanmar sterndrive systems. Proper installation helps support dependable operation and reduces the risk of issues caused by incorrect ratio selection, incompatible shift controls, poor alignment, improper sealing, or non-approved installation modifications.
Worldwide Marine Equipment Supply
The Yanmar ZT370H Electro-Magnetic Shift Ratio 2.18 (Loose) ZT370H-E-218 is suitable for customers requiring professional marine propulsion component supply.
With experience shipping marine engines, transmissions, sterndrives, marine gearboxes, transom assemblies, saildrives, and spare parts worldwide, this component can support vessel owners, shipyards, marine technicians, and repower specialists requiring dependable Yanmar drivetrain solutions.
Technical Specifications
| Specification | Details |
|---|---|
| Product Name | Yanmar ZT370H Electro-Magnetic Shift Ratio 2.18 (Loose) |
| Part Reference | ZT370H-E-218 |
| Manufacturer | Yanmar |
| Product Type | Sterndrive transmission unit / marine gearbox component |
| Sterndrive Compatibility | Yanmar ZT370H Series Sterndrive Systems |
| Shift Configuration | Electro-Magnetic Shift |
| Reduction Ratio | 2.18:1 |
| Configuration | Loose sterndrive transmission unit |
| Application | Sterndrive marine propulsion |
| Control Compatibility | Compatible electro-magnetic shift control systems |
| Suitable Vessels | Sailboats, powerboats, compatible marine installations |
| Typical Use | Transmission replacement, scheduled maintenance, sterndrive service, repower work, refit, new installations |
| Main Function | Transfers engine torque through the marine gearbox to the propeller assembly |
| Component Type | OEM Yanmar marine propulsion component |
Key Product Details
The Yanmar ZT370H Electro-Magnetic Shift Ratio 2.18 (Loose) ZT370H-E-218 is an OEM Yanmar sterndrive transmission unit designed for compatible ZT370H electro-magnetic shift propulsion systems.
Key details include:
- ZT370H-E-218 part reference
- Designed for Yanmar ZT370H sterndrive systems
- 2.18:1 reduction ratio
- Compatible with electro-magnetic shift interfaces
- Supplied as a loose sterndrive transmission unit
- Supports correct engine-to-propeller torque transfer
- Suitable for replacement, scheduled maintenance, refit, repower, and new installations
- Built as an OEM Yanmar marine gearbox component
This transmission unit should be selected only when the vessel requires this exact Yanmar ZT370H electro-magnetic shift ratio and compatible sterndrive configuration.
Frequently Asked Questions
What is the Yanmar ZT370H Electro-Magnetic Shift Ratio 2.18 used for
The Yanmar ZT370H Electro-Magnetic Shift Ratio 2.18 is used as a sterndrive transmission component in compatible Yanmar ZT370H propulsion systems requiring a 2.18:1 reduction ratio and electro-magnetic shift interface.
What is the part reference for this unit
The part reference is ZT370H-E-218.
What does the 2.18 ratio mean
The 2.18:1 reduction ratio refers to the gearbox ratio used to match engine output to the propeller drive requirements in compatible ZT370H sterndrive systems.
What does electro-magnetic shift mean
Electro-magnetic shift refers to a shift configuration that uses electromagnetic actuation for gear engagement within compatible marine control systems.
Is this unit supplied loose
Yes. This product is supplied as a loose sterndrive transmission unit for controlled installation, replacement, service, repower, or new system integration.
Is this compatible with all Yanmar sterndrives
No. It is intended for compatible Yanmar ZT370H series sterndrive systems requiring the 2.18 ratio and electro-magnetic shift configuration.
Can this be used for repower projects
Yes, it can be used in compatible repower projects where a Yanmar ZT370H electro-magnetic shift sterndrive transmission with a 2.18:1 ratio is required.
Is this an OEM Yanmar marine propulsion component
Yes. It is described as an OEM Yanmar marine propulsion component for compatible ZT370H sterndrive applications.
Can this unit be used for scheduled maintenance replacement
Yes, it is suitable for compatible scheduled maintenance replacement where the existing system requires the ZT370H-E-218 specification.
Should compatibility be verified before purchase
Yes. Buyers should verify sterndrive model, gear ratio, electro-magnetic shift requirement, engine compatibility, transom assembly fitment, steering setup, mounting hardware, control system, and propeller requirements before purchase.
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