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...Installation note for piston pin circlips Various types of piston pin circlips are available, which are fitted in different ways. To protect piston pins against axial movement during operation, circlips are fitted in most combustion engines. In such cases, the piston pin still has lim...

...Risk of confusion over air conditioning compressor safety valves Occasionally, when adjusting the oil quantity in a new air conditioning compressor, the safety valve is mistaken for the drain plug. If an air conditioning compressor is replaced, it’s almost always necessary to adjus...

...Characteristic features of electric air conditioning compressors Please pay special attention to the following points when servicing and replacing electric air conditioning compressors. Air conditioning compressors for electric and hybrid vehicles Air conditioning compressors for el...

...Mahle Technical Messenger Issue no. 03/2023 Instructions for fitting piston rings Incorrectly fitted piston rings can give rise to several types of damage. When fitting piston rings on new pistons, the following steps need to be taken to achieve optimal results and to avoid damaging...

...Mahle Technical Messenger Issue no. 04/2023 Installation notes for the oil filter insert OX 1141D There is a risk of inadequate lubrication if the O-rings are mounted incorrectly. The oil filter insert OX 1141D is supplied with all required sealing rings. However, if they are not mou...

...24 Apr Mahle Technical Messenger Issue no. 05/2023 Polymerization of refrigerant R1234yf Polymerization of the refrigerant R1234yf can lead to the total failure of the A/C service unit. In isolated cases, polymerization may occur when A/C service units are filled with the refrige...

...Mahle Technical Messenger Issue no. 07/2023 Notes on the function and replacement of oil control rings (fire rings) Correctly installed fire rings ensure optimal compression and extend the service life of diesel engines. Cylinder liners with an oil control ring, also known as a...

...Mahle Technical Messenger Issue no. 08/2023 Causes of a defective resistor on the interior blower Replacing a defective resistor on the interior blower often fixes the obvious issue without addressing its underlying cause. If the motor of the interior blower will only run at its hi...

...Mahle Technical Messenger Issue no. 09/2023 Notes about lines with spring-lock connectors To avoid damage and subsequent costs, a few things need to be considered when dealing with lines with spring-lock connectors. Lines with spring-lock connectors are becoming increasingly common...

...MAHLE Technical Messenger Issue no. 10/2023 A/C system leaktightness test using a contrast agent If the air conditioning system doesn’t work and there is no or far too little refrigerant in the system, then a leak is usually the cause. The leak will have to be fixed before the...



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