Measurement of the Crankshaft Seals Friction Losses in a Modern Passenger Car Diesel Engine

Christoph Knauder*, Hannes Allmaier, David Emanuel Sander, Theodor Sams

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This paper presents results of experimental investigations on the friction losses of the crankshaft radial lip seals of a modern four-cylinder diesel engine for passenger car applications. A two stage strip-test has been conducted on a motored engine test bed to obtain the friction torque of the radial lip seals. For the experimental investigations with the crankshaft seals removed from the engine, a special sealing apparatus has been designed and built. A wide range of tests have been performed covering the full speed range of the engine at lubricant temperatures of 70 ℃, 90 ℃, and 110 ℃. The results show a dependency on crankshaft speed and engine media supply temperature but also revealed the presence of constant plateaus of friction torque over engine speed.
Original languageEnglish
JournalProceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
Issue number7
Publication statusPublished - 15 Apr 2019

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