Engine Piston / 78mm / Yanmar 4TNV78
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  • Engine Piston / 78mm / Yanmar 4TNV78
  • Engine Piston / 78mm / Yanmar 4TNV78
  • Engine Piston / 78mm / Yanmar 4TNV78

Engine Piston / 78mm / Yanmar 4TNV78

Product code: 4TNV78
Brand 4FARMER
Country of production 4FARMER
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1 person purchased this product
zł189.00
Includes VAT 23%

Lowest price from 30 days: zł189.00

Product description

The 78 mm diameter engine piston for the Yanmar 4TNV78 unit is a high-quality replacement that ensures reliability and long engine life. The complete set includes a piston, pin and two snap rings, which makes assembly easier and reduces repair time. Precise workmanship guarantees perfect fit to the cylinder, minimizing wear and improving engine efficiency.

Dimensions:

  • Diameter: 78 mm.
  • Height: 68 / 85 mm.
  • Pin diameter: 26 mm.
  • Pin hole diameter: 26.05 mm.
  • Distance from end of pin hole to edge of piston: 7 mm.
  • Distance from edge of pin hole to top of piston: 36 mm.
  • Ring groove width from top of piston: 2 / 2 / 4 mm.
  • Index: 4TNV78.

Engine model:

  • Yanmar 4TNV78.

Warehouse: (M01:A64)

*Photos are for illustrative purposes only and may differ in detail from the delivered product due to differences in production over the years.

Specifications

Condition
New
Engine model
Yanmar 4TNV78

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Questions & Answers

Why is regular filter replacement (oil, air, fuel) crucial for a mini tractor?

User
Ekspert Traktor.com.pl – Doradca techniczny • 17.02.2026
Regular filter replacement is the easiest way to extend the life of an engine from brands like Kubota or Yanmar. The oil filter removes metallic contaminants generated during operation, the air filter protects the cylinders from field dust, and the fuel filter prevents water and dirt from damaging the precision injection system. We recommend replacing filters every 50-100 operating hours or at least once per season to ensure optimal engine performance.

How to properly select and sharpen mower blades for a Japanese tractor?

User
Ekspert Traktor.com.pl – Doradca techniczny • 17.02.2026
When selecting mower blades, consider the mower deck model and the blade length and center bore diameter. Maintaining blade balance is crucial when sharpening – an unbalanced blade causes vibrations that damage the hub bearings. Remember that sharp blades mean healthier grass, a cleaner cut, and less strain on the engine of your Iseki or Mitsubishi tractor.

How to identify the correct V-belt size and how to care for it?

User
Ekspert Traktor.com.pl – Doradca techniczny • 17.02.2026
It's best to read the markings on the side of the old V-belt. If they are illegible, measure the belt width and its outer length (La). On Shibaura and Hinomoto tractors, it's important to regularly check the belt tension – too loose a belt will cause slippage and faster wear, while too tight a belt can cause alternator or water pump bearing failure.

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