N21 Pump element

Yanmar N21 Plunger

N21 plunger
Yanmar N21 marine diesel engine (6N21, 8N21, N21A series, 4-stroke medium speed marine engine, bore 210mm)YANMAR
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Description
Engine: Yanmar N21 marine diesel engine (6N21, 8N21, N21A series, 4-stroke medium speed marine engine, bore 210mm)YANMAR
Part: Fuel injection pump plunger assembly (plunger + barrel, with flange & 2 O-ring grooves, Ø21mm)
Fuel version: Two common types
  1. MDO: Marine Diesel Oil
  2. LSMGO: Low Sulphur Marine Gas Oil
Weight: ~3.6 kg per assembly

Function

Plunger controls fuel delivery timing & injection quantity inside the fuel pump. The precise sliding fit between plunger and barrel builds high pressure for fuel injection.