enLanguage
Home / Products / CAT Parts / CAT Pump / Content

Products

CAT 319-0678 High-Pressure Fuel Pump – Hydraulic Noise Suppression with Optimised Pressure Wave Phase Alignment for C7/C9/C9.3 Common-Rail Systems
video
CAT 319-0678 High-Pressure Fuel Pump – Hydraulic Noise Suppression with Optimised Pressure Wave Phase Alignment for C7/C9/C9.3 Common-Rail Systems

CAT 319-0678 High-Pressure Fuel Pump – Hydraulic Noise Suppression with Optimised Pressure Wave Phase Alignment for C7/C9/C9.3 Common-Rail Systems

1. Product:319-0678
2. Compatible Equipment: Diesel Fuel Injection Systems
3. Manufacturer: Aftermarket OEM Replacement
4. Condition: Brand New, Fully Tested
5. Origin: ABOSEDE Diesel
6. Shipping period: 3-5 business days
7. Payment terms: T/T, Western Union, PayPal

Send InquiryChat Now
  • Fast Delievery
  • Quality Assurance
  • 24/7 Customer Service
Product Introduction

In the common-rail fuel system, the high-pressure pump is typically evaluated on flow stability, volumetric efficiency, and durability. Yet a third performance dimension-acoustic signature-is increasingly relevant for applications where cabin comfort and noise regulations matter. The pump generates audible noise not only through mechanical contact (gear mesh, bearing rotation) but also through hydraulic pressure waves that propagate through the fuel and excite the pump housing, the high-pressure lines, and the rail. These hydraulic waves, if left unchecked, produce a high-frequency whine that is transmitted into the cab and the surrounding environment. The CAT 319-0678 addresses this with a pressure wave phase alignment system that shifts the timing of the pressure waves generated by each plunger so that they partially cancel each other out, rather than reinforcing. The result is a pump that delivers a smoother, quieter hydraulic output, reducing the audible noise by up to 4 dB(A) without compromising the flow performance or the rail pressure stability.

Pressure Wave Phase Alignment – The Science of Acoustic Cancellation

The 319-0678's noise suppression is achieved by adjusting the angular spacing of the cam lobes-from the standard 120° to a carefully calculated asymmetric profile. This slight shift-less than 2° of cam rotation-alters the timing of each plunger's pressure wave so that the peaks and troughs of adjacent waves do not align. The result is a 35% reduction in the harmonic content of the pump's output, effectively lowering the amplitude of the most audible frequency components (typically 400–800 Hz). The modification is purely mechanical, requiring no electronic intervention, and does not affect the pump's total flow delivery or its compatibility with the existing ECU calibration.

Pressure wave harmonic reduction: 35% (2nd and 3rd harmonics)

Audible noise reduction: 3–4 dB(A) at idle and light load

Frequency shift: Dominant noise frequency shifted from 550 Hz to 620 Hz, reducing the perceived harshness

Flow impact: None-total flow and ripple remain within OEM specifications

Flow Stability – The Unchanged Foundation

The 319-0678 uses a cam-driven radial three-plunger design with plungers spaced at the modified angular intervals, providing overlapping pressure strokes that maintain the flow interruption at the standard 3.8% ripple-identical to the conventional 120° design. The pump's volumetric efficiency is rated at 91%, meaning that 91% of the theoretical displacement is delivered to the rail, with the remaining 9% accounted for by internal leakage and compressibility.

Material and Surface Engineering – Built for Durability

The 319-0678's plungers and barrels are manufactured from a nitride-hardened steel with a surface hardness of 1,100 HV and a case depth of 0.025 mm, providing resistance to the abrasive wear that increases internal leakage and reduces volumetric efficiency. The cam and camshaft are constructed from a case-hardened alloy steel with a hardness of 58 HRC, providing resistance to the high-contact stresses of the plunger-cam interface. The pump housing is made from ductile iron with a corrosion-resistant coating, providing protection in off-highway environments.

Frequently Asked Questions – Noise and Acoustic Focus

Q1: Will the 319-0678's asymmetric cam design affect my engine's power output?
No. The total fuel delivery and rail pressure capability are identical to the standard pump. The cam lobe timing change only affects the pressure wave phase, not the total flow or the pressure rise rate.

Q2: I'm not concerned about noise-does this pump offer any other advantages?
The noise reduction is the primary differentiator. However, the reduced harmonic content also results in lower vibration transmitted to the high-pressure lines, which can extend the service life of the line fittings and reduce the risk of fatigue cracking.

Q3: Can I install a 319-0678 on a C9.3 engine that originally used a 10R-8899?
Yes, the 319-0678 is a direct replacement for the 10R-8899 in C7/C9/C9.3 engines. The mounting interface and drive coupling are identical. The 319-0678 offers the same flow performance with added noise reduction.

Q4: How can I verify the noise reduction after installation?
Use a smartphone-based sound level meter app placed at a fixed distance from the pump (e.g., 1 metre) at idle. A reduction of 3–4 dB(A) should be measurable compared to the previous pump. More subjectively, the high-pitched "whine" should be noticeably reduced.

Q5: Does the asymmetric cam design increase the load on the camshaft bearings?
The asymmetric spacing introduces a slight imbalance in the plunger forces, but the magnitude is well within the design tolerance of the pump bearings and the engine's camshaft drive. No increase in bearing wear has been observed in extended testing.

Q6: What is the service interval for the 319-0678 in an on-highway truck application?
We recommend inspecting the pump's flow and noise signature every 4,000 hours and replacing it when the flow drops below 50 L/h or when the noise level increases by more than 3 dB(A) from the baseline, indicating internal wear.

202510091606539026

 

 

2

3

4

 

Flexible Payment Methods for Your Convenience

 

To make your purchasing experience smooth and easy, we offer a variety of secure payment options:

product-750-750

Bank Transfer

Pay directly in 15 supported currencies.

west union

Western Union

Quick and global money transfers.

PayPalLogo2014-1024x1014

PayPal

Safe and convenient online payment.

ae99cd49-2667-464e-b9db-b39cee0126e1

Alibaba

Enjoy extra protection with trusted Alibaba transactions.

We're here to make your order process worry-free - choose the payment method that works best for you!

 

Shipping Made Simple

6

Customer reviews

 

8

Hot Tags: CAT 319-0678 High-Pressure Fuel Pump – Hydraulic Noise Suppression with Optimised Pressure Wave Phase Alignment for C7/C9/C9.3 Common-Rail Systems, China CAT 319-0678 High-Pressure Fuel Pump – Hydraulic Noise Suppression with Optimised Pressure Wave Phase Alignment for C7/C9/C9.3 Common-Rail Systems manufacturers, suppliers, factory

You Might Also Like

(0/10)

clearall