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Press release #Mobility Aftermarket
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Switchable water pump in the new timing belt kit from Bosch enables faster engine warm-up

Electrohydraulic switching unit interrupts the flow of coolant while the engine is heating up

  • Enhanced comfort as vehicle interior warms up faster
  • Potential to save fuel, depending on the operating conditions of the engine
  • Complete timing-belt kit with switchable water pump for smooth assembly in the workshop

Laura Cichecki

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Laura Cichecki
Spokesperson Automotive Aftermarket (workshop concepts Bosch Car Service and Autocrew, spare parts, locations Automotive Aftermarket Germany)

Karlsruhe – Once the engine’s been started, it needs to reach operating temperature as quickly as possible, even when it’s cold outside. The switchable water pump in Bosch’s new timing-belt kit shortens the time for the engine to warm up by interrupting the flow of coolant right after the engine starts. This happens by means of an electrohydraulic switching unit, which covers the water pump’s impeller until the engine temperature reaches 60 degrees Celsius. Only then is coolant flow fully restored. When the impeller is covered, the coolant stands still. This allows it to heat up more quickly and shortens the time it takes for the engine to reach operating temperature. As a result, the vehicle interior warms up faster to a comfortable temperature, even in the cold months. This can also save fuel depending on the operating conditions of the engine, such as speed and load condition or external factors such as air pressure and temperature. That’s because the shortened warm-up time reduces the amount of fuel the engine needs in its rich fuel-air mixture. Furthermore, the power released while the water pump is switched off ensures more agile responsiveness and faster acceleration by the engine, even in the warm-up phase.

Fail-safe function in the event of defect of the electrical control circuit

Should the control circuit fail, a fail-safe function ensures that the engine continues to be supplied with coolant: a built-in spiral pressure spring pushes the shutter into the rest position, releasing the impeller for full flow of the coolant and protecting the engine from overheating. To simplify installation in the workshop, Bosch is supplying the new timing-belt kit with switchable water pump. The complete kit also includes the solenoid valve for the switching unit. In addition, ESI[tronic] Evolution from Bosch supports installation of the timing-belt kit with detailed instructions.

Replacing the timing belt regularly prevents consequential damage

The timing belt and any components directly connected to it must be replaced at the intervals specified by the manufacturer, as a torn belt will lead to severe engine damage. ESI[tronic] Evolution provides both the replacement intervals as well as vehicle-specific servicing schedules. And as the connected components are subject to the same wear and tear as the timing belt, Bosch recommends using the complete kits to save time and money when replacing them. In doing so, it’s important to ensure that the tie bolts needed for installing the timing-belt kit are used only once, as multiple uses can lead to material breakage.

Readers’ contact:
Robert Bosch GmbH
Automotive Aftermarket
Phone +49 9001 942-010
E-mail: Kundenberatung.Kfz-Technik@de.bosch.com

Contact person for press inquiries:
Laura Cichecki
Phone +49 721 942 2982

The Mobility Aftermarket division (MA) provides the aftermarket and repair shops worldwide with modern diagnostic and repair shop equipment and a wide range of spare parts – from new and exchange parts to repair solutions – for passenger cars and commercial vehicles. Its product portfolio includes products made as Bosch original equipment, products developed in-house and specifically manufactured for the aftermarket, as well as services. About 16,000 associates, as well as a global logistics network, ensure that spare parts reach customers quickly and on time. MA supplies testing and repair-shop technology, diagnostic software, service training, and information services. In addition, the division is responsible for the “Bosch Service” repair-shop franchise, one of the world’s largest independent chains of repair-shops, with some 13,000 workshops, and more than 1,000 “AutoCrew” partners in over 100 countries. In addition, with Bosch Classic, MA supports owners of classic cars with a wide range of spare parts and services.

Additional information can be accessed at www.boschaftermarket.com

The Bosch Group is a leading global supplier of technology and services. It employs roughly 429,000 associates worldwide (as of December 31, 2023). The company generated sales of 91.6 billion euros in 2023. Its operations are divided into four business sectors: Mobility, Industrial Technology, Consumer Goods, and Energy and Building Technology. With its business activities, the company aims to use technology to help shape universal trends such as automation, electrification, digitalization, connectivity, and an orientation to sustainability. In this context, Bosch’s broad diversification across regions and industries strengthens its innovativeness and robustness. Bosch uses its proven expertise in sensor technology, software, and services to offer customers cross-domain solutions from a single source. It also applies its expertise in connectivity and artificial intelligence in order to develop and manufacture user-friendly, sustainable products. With technology that is “Invented for life,” Bosch wants to help improve quality of life and conserve natural resources. The Bosch Group comprises Robert Bosch GmbH and its roughly 470 subsidiary and regional companies in over 60 countries. Including sales and service partners, Bosch’s global manufacturing, engineering, and sales network covers nearly every country in the world. Bosch’s innovative strength is key to the company’s further development. At 136 locations across the globe, Bosch employs some 90,000 associates in research and development, of which nearly 48,000 are software engineers.

Additional information is available online at www.bosch.com, www.iot.bosch.com, www.bosch-press.com.

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