HH178F Single-Cylinder Air-Cooled Diesel Engine — 296cc | 3.68kW Rated | Direct Injection

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HH178F Powerful Single Cylinder Air-Cooled Diesel Engine

HH178F Single-Cylinder Air-Cooled Diesel Engine — 296cc | 3.68kW Rated | Direct Injection

HH178F Powerful Vertical Single Cylinder Air-Cooled Diesel Engine | Direct Injection | Kick Start/Electric Start

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Model:
HH178F
Brand:
HuaHe

Product Overview

The HH178F is a vertical, single-cylinder, four-stroke, air-cooled diesel engine with 296cc displacement (bore × stroke: 78mm × 62mm). At 3,000 RPM, it delivers a rated output of 3.68 kW and a maximum output of 4.0 kW; at 3,600 RPM, rated output rises to 4.0 kW with a maximum of 4.4 kW.

Designed for integration into a wide range of agricultural and light industrial equipment — including small generators, diesel water pumps, walk-behind tillers, and concrete mixers — this engine combines a 20:1 compression ratio with a direct injection fuel system to deliver reliable cold-weather starting and efficient part-load performance.

With a fuel consumption rating of <280 g/kW·h and a 3.5-liter fuel tank, the HH178F provides approximately 3 hours of continuous operation at 3,000 RPM (or 2.5 hours at 3,600 RPM) between refuels — a critical consideration for equipment used at remote worksites without easy fuel access.

Two starting configurations are available: kickback manual (recoil) start at 31 kg gross weight, and electric start at 37 kg gross weight. Both share the same mechanical base and deliver identical power output.

FAQ

Q1: What type of oil should I use in the HH178F engine?

A1: For optimal performance and longevity, we recommend using CD grade or SAE 10W-30/15W-40 engine oil. The total oil capacity is 1.1 liters.

Q2: What are the main applications for this engine?

A2: The HH178F is a versatile power unit widely used in agricultural machinery (like micro tillers and small tractors ), industrial equipment (such as generators, water pumps, and concrete mixers), and construction tools .

Q3: How do I maintain the air filter?

A3: Regular maintenance is key. In dusty conditions, check the air filter daily. It should be cleaned or replaced as needed to prevent air intake blockage, which can reduce engine power and increase emissions . Refer to your engine manual for specific intervals.

Q4: What should I do if the engine is hard to start?

A4: First, check the basics: ensure you have fresh, clean fuel and that the engine oil is at the correct level. Common causes include fuel contamination or air in the fuel system . Check the fuel filter and bleed the fuel line if necessary. Glow plugs (if equipped) should be inspected in colder climates .

Key Technical Highlights

1. Direct Injection at 20:1 Compression Ratio — Built for Cold-Climate Starting

The HH178F uses a direct injection (DI) combustion system paired with a compression ratio of 20:1 — one of the highest in its displacement class. This combination generates sufficient heat at TDC to achieve reliable self-ignition without auxiliary heating aids in temperate conditions. The engine supports -20# winter-grade diesel, making it suitable for deployment in northern agricultural regions during cold seasons.

For buyers sourcing diesel engines for markets with temperature variation (e.g., Central Asia, Eastern Europe, highland Africa), this is a decisive specification.

2. Air-Cooled Design — Zero Coolant Infrastructure Required

The HH178F eliminates the radiator, water pump, coolant reservoir, and associated hoses required by liquid-cooled alternatives. In practical terms:

No coolant-related downtime: Liquid-cooled engines at worksites frequently fail due to coolant leaks, frozen coolant lines, or radiator blockage by dust and crop debris. The HH178F has none of these failure modes.
Lower ambient sensitivity: Air cooling performs effectively across a wide ambient range without the risk of overheating caused by coolant degradation.
Reduced maintenance SKUs: Buyers who operate fleets of 10+ units (water pump stations, generator rental companies) can eliminate coolant from their parts inventory entirely.

3. Fuel Economy — <280 g/kW·h Consumption Rate

The rated fuel consumption of <280 g/kW·h is the measured efficiency benchmark for this engine at rated load. On a 3.5 L tank at 3,000 RPM, this translates to approximately 3 hours of operation — a critical figure for operators planning shift lengths or calculating fuel logistics for remote deployments.

Note: Actual consumption varies with load factor, altitude, and ambient temperature. The <280 g/kW·h figure applies at rated load under standard test conditions.

4. Dual Start Options on a Common Platform

The kickback manual start (31 kg) and electric start (37 kg) variants share an identical mechanical core. This means:

OEM customers integrating the HH178F into their product lines can source both variants from a single BOM with minimal design change.
End users in grid-connected facilities benefit from the convenience of electric start; those in remote off-grid applications retain full starting reliability without battery dependency.
The 6 kg weight difference between variants is attributable entirely to the starter motor and battery mounting hardware.

Application Fit Matrix

Application	Recommended Speed	Notes
Small diesel generators (2–3.5 kW output)	3,000 RPM	Matches standard 50 Hz generator speed; rated 3.68 kW output provides headroom for generator set efficiency losses
Agricultural water pumps (2–4 inch)	3,000 or 3,600 RPM	Anticlockwise rotation shaft; confirm pump coupling compatibility
Walk-behind tillers (e.g., 1WG4D type)	3,000 RPM	Compact 480 × 465 × 520 mm footprint suits standard tiller frames
Portable concrete mixers	3,000 RPM	Air-cooled design handles dusty jobsite conditions

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Model	HH178F
Type	Vertical,single cylinder,four stroke,air-cooled,direct injection
Bore*Stroke(mm)	78mm*62mm
Displacement(L)	0.296
Engine Speed(kw/r/min)	3000	3600
Rated Power Output(kw)	3.68	4
Max Power Output(kw)	4	4.4
Fuel Consumption	＜280
Fuel Type	0#/-10#/-20#
Engine Oil Type	CD grade or SAE 10W-30/15W-40
Compression Ratio	20
Rotation Direction	anticlockwise
Starting System	Kickback manual start or electric start
Engine Oil Capacity(L)	1.1
Fuel Tank Capacity(L)	3.5
Duration of Operation(h)	3	2.5
Dimension(LWH)mm	480465520
Gross Weight(kgs)	31(manual start)/37(electric start)