Dust in open-pit diesels: ultrasonic tightness testing as engine protection

At Kazakhstan's open pits and processing plants, abrasive dust is the main enemy of the diesel engines in haul trucks, excavators and drill rigs. Even a healthy air filter cannot save the engine if there is a leak in the intake downstream of the filter: dust goes straight into the cylinders. An ultrasonic tightness test finds those spots in minutes.

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Why the filter is "fine" but the engine still eats dust

The classic scenario:

1. The filter is replaced on schedule.
2. Power drops, oil consumption rises.
3. Teardown shows scoring and liner wear.
4. The cause is unfiltered air being drawn in at clamps, cracked hoses, covers and loose joints downstream of the filter.

Visual inspection and soap solution work poorly on large machines and in dusty conditions. What you need is a "pressure / vacuum + ultrasound" method.

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The SDT method

Instruments: SDT340, TIGHTChecker or SDT270.

1. Isolate the intake section per the OEM / service instructions.
2. Apply slight positive pressure or vacuum (within the safety procedure).
3. Survey the joints with an airborne sensor — a leak "whistles" in ultrasound.
4. Mark and repair the leaks, then repeat the test.

The same principle applies to operator cabs, hydraulic tanks and other sealed volumes — see the tightness pillar.

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Where to deploy it at a mine site

Asset	Inspection points
Haul trucks	hoses downstream of the filter, intercooler, joints
Excavators / loaders	air path, air cleaner covers
Stationary gensets	intake, panels, seals (e-PCM for generators)
Drill rigs	intake plus operator cab tightness

Industry context: SDT at mining and processing plants.

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Link to the reliability programme

The tightness test is a fast preventive layer:

• before the dust-storm season;
• after any intake repair;
• whenever oil consumption rises or compression drops without explanation.

It complements the bearing and compressed-air-leak route — 90 days with SDT.

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Conclusion

At an open pit it is far cheaper to find a whistle at a clamp than to overhaul a diesel. Ultrasonic tightness testing gives evidence-based localisation of intake leaks and belongs in the service checklist for heavy mining equipment.

Products: TIGHTChecker, SDT340 · SDT.