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Premium-quality carburettor restoration: How ultrasound saves the mechanical heart of your engine

A classic engine is a mechanical masterpiece, yet its performance stands or falls on a single component: the carburettor. It is the heart and lungs of the engine, responsible for the precise calibration of the fuel-air mixture. However, particularly after long periods of inactivity – such as after the winter break – the anticipation of starting the engine for the first time often turns to frustration. The engine sputters and stutters, idles far too leanly or cuts out immediately when the load changes.

The cause is almost always hidden deep inside the carburettor. And anyone who attempts to clean the microscopically fine brass jets with brake cleaner, compressed air or even a steel needle risks causing irreparable engine damage due to changes in the flow cross-sections. Professional repair requires precision: ultrasonic cleaning.

Save your carburettor from complete failure

Save yourself the frustration of repeated start-up attempts and risky cleaning experiments. Discover BANDELIN’s professional ultrasonic solutions and restore the heart of your engine to its former peak performance whilst protecting the materials.

The chemical enemy: bioethanol and the danger in the capillaries

The greatest threat to traditional carburettor systems today comes directly from the petrol pump. Modern fuels contain bioethanol (such as E10). If the volatile components of the petrol evaporate whilst the vehicle is stationary, viscous, extremely stubborn resins remain in the carburettor. These resin deposits clog the delicate idle jets and fine transition bores with millimetre precision.

Cavitation in the BANDELIN ultrasonic bath is the only technology capable of dislodging these residues from even the most remote corners without physical contact. However, the mechanical process alone reaches its limits when dealing with resinified bioethanol. Additional chemical assistance is required here.

Ultrasound cleaning

The right products for every application

SONOREX SUPER RK 102 H Ultrasonic Bath with Heater
1.293,00 € (plus Shipping & VAT) Commercial customers only
excl. 19% VAT

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SONOREX K 3 C insert basket
74,00 € (plus Shipping & VAT) Commercial customers only
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TICKOPUR R 33 Universal cleaner for ultrasonic cleaning, concentrate
25,00 € - 1.320,00 € (plus Shipping & VAT) Commercial customers only
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Example application in the video

We have put together an overview of sample cleanings for you to carry out an optimal US cleaning.

Choosing the right chemical: TICKOPUR R 33 or TICKOPUR TR 3?

The mechanism of the ultrasonic cleaner requires the appropriate cleaning agent. When reconditioning a carburettor, the exact nature of the contamination and the material in question determine the choice of cleaning agent.

TICKOPUR R 33 as a universal base

This mildly alkaline all-purpose cleaner is the standard product for technical carburettor cleaning. It reliably removes general operational dirt, oils, greases and soot from surfaces. As the product is highly compatible with materials and is specifically suitable for light metals, it provides a reliable foundation for everyday workshop use. It removes contaminants from the channels and float chambers, restoring the carburettor to full working order.

TICKOPUR TR 3 for mineral deposits and oxidation

If the carburettor shows signs of specific contamination, such as limescale deposits caused by water in the fuel system or severe oxidation, this special citric acid-based formula is used. It dissolves inorganic deposits and restores the lustre to tarnished light-metal surfaces. This restores the component’s clean metallic base structure. Professional caution is required when using this product. As carburettor housings are often made of die-cast zinc and the formula can corrode materials such as zinc or tin if left to act for too long, compatibility must be checked in advance and the ultrasonic treatment time on the component must be closely monitored.

Preparation: Why rubber and ultrasound don’t mix

It is one of the most common questions asked before cleaning: does the carburettor really need to be completely dismantled? It is, of course, tempting to save yourself the trouble and simply place the component, whilst still assembled, into the ultrasonic bath. However, experts advise against this – for very sound physical reasons. Soft components such as O-rings, seals or rubber diaphragms should be removed beforehand.

The sponge effect: Rubber-like materials have damping properties; they literally absorb the ultrasonic waves. The valuable cavitation energy is dissipated in the soft material. In practical terms, this simply means that the soiled metal surfaces lying directly beneath or behind the rubber are not reached by the ultrasound and remain soiled.
Risk of loose parts: Ultrasound generates constant vibrations in water. Seals or small components that are not absolutely secure may come loose as a result of this movement during cleaning. They then float around uncontrollably in the bath and have to be laboriously fished out of the solution afterwards.

Expert tips for the cleaning process

Anyone placing their carburettor in the ultrasonic bath should not leave the appliance unattended. Soft alloys such as die-cast zinc may darken or be chemically corroded if left in the bath for too long. The rule of thumb is: Short intervals. It’s better to check the component every minute rather than leaving it in the bathroom for 10 minutes.

The trick with the blind holes: Carburettor housings are criss-crossed with minute blind holes and winding channels. When you lower the component into the bath, tiny air bubbles can become trapped there. Where there is air, there is no liquid – and therefore no cleaning cavitation. The solution: Gently move the immersion basket up and down for the first few seconds. This flow dislodges the air bubbles blocking the holes and clears the way for the ultrasound.

The finish: water, air and a persistent myth

Once removed from the bath, the cleaning chemicals should be rinsed off immediately and thoroughly under running water. All channels are then meticulously blown out with compressed air.

In the motoring community, there is a persistent myth that moving parts – such as the throttle shaft – must be immediately drenched in penetrating oil after cleaning to prevent crevice corrosion. Experts advise a more relaxed approach here: If the carburettor is reassembled and put back into service promptly, this is completely unnecessary. The fuel flowing through it lubricates the fine gaps all by itself. Only in the case of planned, long-term storage on a shelf for several years does applying a preservative oil make sense.

The perfect solution for stubborn resin build-up

If biofuels have clogged the delicate jets in your carburettor, washing-up liquid won’t be enough. Put your trust in the chemical precision of TICKOPUR TR 3, which is citric acid-based – gentle on light metals, yet relentless against resin and oxidation.

FAQ

Why don’t E10 deposits dissolve with ordinary washing-up liquid?

Modern bioethanol residues form extremely solid, polymeric structures. Standard washing-up liquid or water cannot chemically break down these resins. An acidic environment, such as that provided by TICKOPUR TR 3 (citric acid-based), is required to break down the resin’s bonds so that ultrasonic cavitation can remove them.

Can I leave the O-rings and rubber diaphragms in the carburettor whilst cleaning it?

No. Soft materials absorb (swallow) the ultrasonic waves. As a result, no cavitation takes place at these points or directly beneath them – the carburettor does not get clean. Furthermore, the sensitive elastomers may swell due to the cleaning chemicals or the bath temperature and become unusable.

How can I prevent the deep holes in the carburettor from getting dirty?

The biggest problem with blind holes and deep bores is trapped air bubbles, which prevent the ultrasonic waves from reaching the metal. Immediately after immersing the basket in the liquid, gently move it up and down several times to mechanically flush these air bubbles out of the channels.

How long can an aluminium carburettor be left in an ultrasonic bath?

There is no standard time frame, as carburettor alloys (aluminium, die-cast zinc, magnesium components) react in extremely different ways. Excessive ultrasonic treatment can lead to an unsightly dark discolouration or a dull tarnish. The professional approach: Check the result at one-minute intervals and inspect the component regularly.

Do I absolutely have to oil the carburettor after ultrasonic cleaning?

Only if it is stored as a spare part for a long period of time. If it is fitted back into the vehicle straight away, it is sufficient to rinse it thoroughly with water and dry it completely with compressed air. During normal operation, the fuel itself ensures that moving parts, such as the throttle shaft, are adequately lubricated.

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Bandelin Electronic

Quality since 1955

We - a Berlin-based family business in its third generation - specialise in the development, manufacture and distribution of ultrasonic devices, corresponding accessories and application-specific cleaning and disinfection preparations. The high vertical range of manufacture, a modern production facility and motivated employees distinguish us and are guarantors for constantly new quality products.