A Coruña, Spain – The YouTube channel “LEONARDI high performance” has posted a revealing video detailing the rebuild process of a 1.2 PureTech engine from a DS3, but at the same time a harsh criticism of the design of this engine and the response of the manufacturer, Stellantis (Peugeot/Citroën).
The video shows the complete disassembly of the engine, sent to a specialized workshop for the grinding of the cylinders. The presenter stresses the importance of this professional process, especially when using the original pistons and rings.
“Factory defect” and lack of accountability
The video calls the PureTech engine a “factory defect” and accuses Stellantis of not taking responsibility. Common problems such as premature deterioration of the timing belt, oil consumption and carbon build-up are mentioned. The presenter rules out quick fixes such as reducing fuel pressure, arguing that they could lead to other problems.
Final solution?
The mechanic believes that the only “ultimate solution” would be to replace the engine completely, and that the rebuild shown in the video is only a “palliative solution” as it uses original parts, meaning that the same problems are likely to recur. He suggests that the only way to prolong its service life with original parts is extremely frequent and costly maintenance (oil changes every 3,000-4,000 km, timing belt every 20,000 km, regular internal cleaning).
Reconstruction details
The video shows the reassembly process, using new original pistons with pre-installed rings. The connecting rod bolts are replaced due to their small size and potential for stretching. Crankshaft and connecting rod tightening torques are detailed. The cylinder head and block did not require machining. A special aerosol gasket sealant is used on both sides of the cylinder head gasket as a precaution.
The video ends before the complete engine assembly is completed, promising a second part.
For more information, you can watch the complete video on the LEONARDI high performance channel on YouTube and Part 2: PURETECH ENGINE THE SCAM OF THE CENTURY PART 2.