Buy New Yanmar 4LHA-HTP (Z) 160HP Inboard Diesel Engine for sale online, If you’re in the market for a reliable and powerful marine engine, the Yanmar 4LHA-HTP (Z) 160HP inboard diesel engine might be just what you need.
$4,445.00
When it comes to reliable marine propulsion, the Yanmar 4LHA-HTP (Z) 160HP Inboard Diesel Engine stands out as one of the most trusted and time-tested diesel engines in the marine industry. Designed with a perfect blend of Japanese engineering precision and real-world performance demands, this diesel engine is widely used in recreational boats, commercial vessels, and light-duty marine applications.
In this comprehensive guide, we will explore everything you need to know about the Yanmar 4LHA-HTP (Z), including its specifications, features, performance, maintenance, benefits, and comparisons. Whether you’re looking to repower your boat or simply researching high-performance diesel engines, this article is tailored for you.
Overview of the Yanmar 4LHA-HTP (Z)
Technical Specifications
Key Features
Performance Analysis
Applications and Compatibility
Pros and Cons
Maintenance and Service
Fuel Efficiency and Emissions
Common FAQs
Final Thoughts
The Yanmar 4LHA-HTP (Z) is a 4-cylinder, 4-stroke, turbocharged inboard marine diesel engine. Built for medium-duty to semi-commercial operations, it delivers an output of 160 horsepower (118.5 kW) at 3300 RPM. It’s part of Yanmar’s highly reputed 4LHA series, known for efficiency, quiet operation, and long-term reliability.
The suffix “Z” in this engine’s name typically denotes a ZF marine gear drive configuration, making it ideal for direct inboard propulsion systems. This engine is celebrated for its compact size, solid torque delivery, and low-vibration operation, making it a go-to choice for vessels ranging from powerboats to small commercial fishing boats.
| Specification | Details |
|---|---|
| Model | Yanmar 4LHA-HTP (Z) |
| Engine Type | 4-cylinder, 4-stroke, turbocharged, diesel |
| Power Output | 160 HP (118.5 kW) @ 3300 RPM |
| Displacement | 3.455 liters (211 cubic inches) |
| Bore x Stroke | 100 mm x 110 mm |
| Aspiration | Turbocharged with intercooler |
| Cooling System | Freshwater-cooled with heat exchanger |
| Fuel System | Direct injection |
| Weight | Approx. 475 kg (1047 lbs) without gear |
| Transmission | ZF marine gear (various gear ratios available) |
| Emissions Compliance | EPA Tier 2, EU RCD |
| Maximum Torque | Around 400 Nm @ 2000 RPM |
| Alternator | 12V-80A standard |
The Yanmar 4LHA-HTP features a turbocharger with an intercooler, which enhances air intake, allowing more fuel to be burned efficiently. This translates to better throttle response and higher power-to-weight ratio.
Despite being a 4-cylinder engine, it offers low levels of vibration thanks to precision-balanced internal components and well-designed engine mounts.
The (Z) version comes ready for installation with a ZF marine transmission, making it compatible with various propulsion systems, including shaft drives and stern drives.
The compact design allows for easy installation in engine compartments where space is limited—ideal for repowering older boats.
This engine incorporates a high-pressure fuel injection system, optimizing fuel atomization and reducing fuel consumption.
Its heat exchanger-based cooling system ensures that saltwater doesn’t enter the engine block, significantly increasing durability.
The Yanmar 4LHA-HTP (Z) offers excellent mid-range torque, which is crucial for marine vessels that need to move quickly from idle to cruising speed. Its performance curve provides enough muscle to carry vessels through rough waters while maintaining good fuel economy.
High torque at low RPM makes it ideal for boats requiring strong acceleration and load-carrying capability.
Top speed and cruise speed balance ensures long-range cruising with reduced engine strain.
Efficient power delivery without sacrificing engine lifespan.
This engine is popular in the following types of marine vessels:
Recreational Boats (25–40 feet)
Light Commercial Fishing Boats
Charter Vessels
Pilot Boats
Workboats
Tenders
It fits well with vessels needing durable, efficient, and easy-to-service diesel propulsion systems.
✅ Fuel-efficient with direct injection
✅ Quiet and smooth even under heavy load
✅ Compact and reliable marine engine
✅ Compatible with ZF transmissions
✅ Easy to service and access parts
✅ Long history of field-proven performance
❌ Heavier than some newer lightweight engines
❌ Not Tier 3 or Tier 4 compliant – may not meet stricter emission laws in future
❌ Older technology compared to Yanmar’s common-rail engines
| Interval | Maintenance Task |
|---|---|
| Every 50 hours | Check oil, belts, coolant |
| Every 100 hours | Change engine oil and filter |
| Every 250 hours | Fuel filter replacement |
| Every 500 hours | Valve adjustment, impeller check |
| Annually | Coolant flush, heat exchanger cleaning |
Yanmar engines are known for their longevity and durability. With regular maintenance and genuine parts, these engines can run for 10,000+ hours.
Use Yanmar-approved oils and coolants
Flush the cooling system periodically
Check and replace anodes regularly
Inspect turbocharger and intercooler annually
The Yanmar 4LHA-HTP (Z) is designed to maximize fuel efficiency, especially at cruising RPMs. On average, fuel consumption sits around 8-12 liters per hour at 75% throttle, depending on the load and sea state.
Meets EPA Tier 2
Compliant with EU Recreational Craft Directive (RCD)
Not compliant with latest IMO Tier III or EPA Tier 3/4 standards
For operators in regions with relaxed emissions regulations, the engine remains a highly viable and cost-effective choice.
As of recent years, Yanmar has shifted its focus to newer common-rail engines. However, the 4LHA-HTP is still supported with parts and widely available on the used market.
Boats between 25–40 feet in length with a single or twin-engine setup are ideal candidates. Fishing boats, trawlers, and cruisers often use this model.
A brand new engine (if available) costs around $18,000–$22,000 USD, while used models range from $6,000–$12,000, depending on condition and hours.
It typically comes with a ZF 63A or ZF 63IV marine transmission, but can also be paired with other models upon request.
Check engine hours, compression readings, turbo condition, maintenance logs, and ensure the cooling system is corrosion-free.
If you’re searching for a high-performance marine engine that blends fuel efficiency, durability, and power, look no further than the Mercury 230 HP 3.0L Inboard Diesel Engine. Manufactured by Mercury Marine, a global leader in marine propulsion, this engine has become a top choice for commercial vessels, recreational boats, and government marine applications alike.
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Buy New Mercury 230 HP Sterndrive 3.0L Inboard Diesel Engine for sale online, When it comes to performance, reliability, and efficiency in marine engines, the Mercury 230 HP Sterndrive 3.0L Inboard Diesel Engine stands out as a top choice for boat owners.
The 6LF engine is a compact and powerful common rail diesel engine, perfect for planing and semi-planing vessels, both recreational and light duty commercial. Controlled by the YANMAR VC20 system, it expands YANMAR brand’s line with higher horsepower, providing the largest common rail, electronically managed marine diesel line-up in the industry.
1981-1995 Toyota Pickup 2.4L 4-Cylinder Brand New Engine 22R 22RE *0 MILES / 6-Months Warranty* 
Mercury 230 HP 3.0L Inboard Diesel Engine 
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