Plunger 576 – PS-Series High-Pressure Pump Element For Longbeng / Weichai / SINOTRUK Applications

In any mechanical diesel pump, the plunger element is where pressure is really made. If that tiny cylinder is worn or poorly machined, you'll see it immediately: harder starts, unstable idle, extra smoke and higher fuel use. The Plunger 576 (often labelled "PS series fuel pump plunger 576" or "P576 / ZS576") is a precision high-pressure element designed for diesel injection pumps on Longbeng/PS-type pumps, widely supplied for Weichai and SINOTRUK HOWO A7 and other Chinese heavy-duty engines

 

 

Across specialist diesel parts suppliers, you'll see a consistent description:

Part name: Diesel fuel injection pump plunger / element

Code: 576 (sometimes "Plunger 576", "P576" or "PS plunger 576")  

Series: PS-type / PS-series fuel pump plunger  

Nominal plunger diameter: Ø12 mm  

Typical applications mentioned in listings:

Longbeng diesel injection pumps

High-pressure pump element P576 / ZS576 for SINOTRUK HOWO A7, often with Weichai / Sinotruk  

General purpose diesel engines using PS-type inline/rotary pumps 

If your pump data sheet, parts book or old element is marked 576 / P576 / ZS576 for a PS-series pump, this is the replacement family you're looking at.

 

 

A PS-series pump uses one plunger element per pumping section. The 576 element directly controls:

Injection pressure – the plunger's tight clearance to the barrel builds the high pressure needed for correct atomisation. If that seal is worn, pressure drops and the spray collapses.

Injected volume – any leakage past the plunger equals lost fuel; that shows up as power loss and cylinder imbalance.

Timing repeatability – good hydraulic sealing and consistent stroke keep the beginning of injection where the engine designer intended.

Upgrading or renewing to a correctly machined Plunger 576 therefore helps:

Shorten crank time, especially hot starts

Smooth out idle and reduce "nailing" on one or two cylinders

Cut visible smoke when the truck or machine pulls away

Stabilise fuel consumption over a shift

Suppliers of Diesel Fuel Injection Plunger Element Assembly 576 specifically highlight fast delivery and good quality for pump rebuilders, reflecting how critical this part is to successful overhauls

 

 

→ Frequently listed for Denso HP-series supply pumps; some sellers tag it for HP4 as well as HP3/HP4 crossover fitments - always confirm the pump body code on your vehicle or pump assembly before ordering.
→ Common in aftermarket listings for light-commercial diesel models (fitment notes vary by region and vendor).

 

 

Based on typical PS-series plunger 576 offers, you can confidently describe:

Material: High-strength alloy or tool steel body, hardened and ground for wear resistance under repeated high-pressure cycles 

Finish: Precision-ground plunger surface for ultra-tight clearance; polished working faces to minimise scuffing in low-lubricity fuel

Dimensions: Nominal 12 mm plunger diameter, PS-series length form factor (fits standard PS-type barrels designated for "576") 

System type: Diesel injection pump high-pressure element (mechanical pump), not a complete pump or injector

Packaging: Standard export/neutral packing; often offered individually or in multi-piece sets for pump rebuilds, with low MOQs starting from 1–4 pcs. 

You can summarise it on your site as:

"PS-series fuel pump plunger 576, Ø12 high-pressure element for Longbeng / Weichai / SINOTRUK diesel engines – new, precision-ground steel plunger, ready for pump calibration."

 

 

On a Google-facing product detail page, it helps to speak in scenarios rather than just part numbers:

HOWO / construction truck with PS-type pump
The engine still starts, but haze and fuel use are creeping up. During a scheduled pump overhaul, the workshop chooses a full set of Plunger 576 elements to restore equal delivery across all cylinders. 

Longbeng pump reconditioning
A diesel shop reuses the pump body and governor, but replaces all wear components – including the 576 plunger elements – to supply a "like-new" exchange pump.

Small fleet life-extension
Instead of swapping engines, the operator refreshes injectors, lines and pump elements on a trusted Weichai/Sinotruk chassis, gaining another service life at a fraction of replacement cost.

 

 

You don't need to write a service manual, but a simple checklist in the description builds trust:

Strip and inspect – remove the old element from the PS-series pump section; check for scoring, pitting or corrosion.

Ultra-clean assembly – clean pump body galleries thoroughly; tiny debris will quickly damage a new 576 plunger.

Install matched plunger & barrel – always treat the plunger and its barrel as a set; do not mix components from different pairs.

Bench calibration – after assembly with new plunger 576 elements, run the pump on a test stand to set delivery quantity and timing per cylinder.

On-engine verification – once refitted, confirm easy start, stable idle and reduced smoke under working load.

 

 

 

 

 

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