VolvoEngine Parts

21569200 Unit Injector — Volvo FMX FE Series trucks — FH400

This unit injector is a sophisticated electro-mechanical component that precisely meters and injects fuel directly into the combustion chamber under extremely high pressure. It is engineered to meet strict OEM tolerances for optimal fuel atomization and combustion efficiency, ensuring reliable engine operation unlike a worn injector that may cause rough idling or misfires. Operators may notice a significant decrease in engine performance, increased fuel consumption, rough idling, or visible smoke from the exhaust when an injector begins to fail.

Unit Injector – Part No 21569200 – Volvo Spare Part
Part Specifications
BrandVolvo
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeUnit Injector (HEUI)
MaterialHardened steel and precision-machined components
ApplicationDirect fuel injection system
Service LifeReplace as needed based on performance diagnostics
CompatibilityVolvo specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial symptoms of a failing unit injector often include rough idling, noticeable power loss, and increased exhaust smoke. If ignored, the injector may begin to leak fuel internally or externally, leading to poor fuel economy and potential starting difficulties. In severe cases, a malfunctioning injector can cause cylinder damage due to improper combustion or fuel washing the cylinder walls, leading to significant engine repair costs.

Installation Tip

Ensure the injector bore in the cylinder head is meticulously clean and free of any debris before installing the new unit. Avoid applying excessive force or using improper tools when seating the injector, as this can damage the injector body or the cylinder head.

Service Note

When replacing a unit injector, it is recommended to inspect the associated fuel lines, seals, and the engine wiring harness for any signs of wear or damage.