Description

Revive Your Vehicle’s Turbo Performance

Is your classic mechanical turbo-diesel suffering from a sudden loss of top-end power? Is it struggling to accelerate when the turbo spools up, or feeling sluggish under load? A torn, cracked, or perished Boost Compensator (Aneroid / LDA) Diaphragm is the most common and cost-effective failure point on Zexel and Bosch VE rotary injection pumps.

How the Boost Compensator Diaphragm Works

In mechanical distributor-type injection pumps (like those on the legendary Mazda/Ford WL-T or Nissan TD42), fuel delivery must precisely match the air volume provided by the turbocharger. The boost compensator sits directly at the top of your injection pump. As your turbo builds boost pressure, air travels through a reference line into the top housing, pushing down on this rubber diaphragm.

This downward movement forces the internal eccentric fuel pin to slide, signaling the pump’s governor to mechanically increase fuel volume. When this diaphragm develops micro-tears or splits from decades of engine heat and oil vapor exposure, the air pressure leaks out. The pump never receives the signal that boost is active, leaving your engine starved of fuel exactly when it needs it most.

Why Choose Our Premium Replacement Diaphragm?

• Durable Construction: Made from high-grade, fuel-resistant synthetic elastomers designed to withstand modern low-sulfur diesel, biodiesel blends, and high engine bay temperatures without prematurely hardening.
• Perfect Fitment: Tailored precisely to factory dimensions for a drop-in installation, eliminating the risk of pressure leaks around the sealing lip.
• Tuning Friendly: An essential replacement part if you are opening your pump top-cover to rotate or adjust your fuel pin for enhanced off-road performance.

Vehicle & Engine Compatibility Guide

This diaphragm perfectly fits Zexel (Diesel Kiki) and Bosch VE series mechanical turbo-diesel injection pumps. Common vehicle applications in southern Africa include:

Technical Specifications:

• Manufacturer Part Numbers: 1147400582 / 114740-0582
• Bosch / Zexel Cross-Reference: 9461613524 / 9 461 613 524
• Component Type: LDA Membrane / Aneroid Control Diaphragm
• Placement on Pump: Top-mounted boost compensator cap