Dr. Tono Nasch Russia Lubricants 2007, Moscow Online Wear Measurements by means of Radiotracer Technique

Overview  Conventional Wear Measurements  RNT Measurement Principle  Activation of Engine Parts  RNT Measurement System  Examples of RNT Tests  Summary

Conventional Wear Measurements Engine Components (Examples)  Camshaft  Cylinder Liner  Piston Ring (radial / axial)  Piston Ring Groove  Bearings  Timing Chain  […] Precision: 1 µm Based on pre- and post test measurements Long Running Time of Test Engine

RNT Measurement Principle The characteristic  -radiation of the wear particles originating from the activated area of the engine part is registered by a detector system RNT=Radio – Nuclid - Technique TLA=Thin – Layer - Activation

Activation of Engine Components

RNT – Area of Application MaterialIsotopeT1/2 [d]Min. Time of Usage [d] Cam / TappetFe / FeCo57 / Co56273 / / 240 Cylinder Wall / Piston Ring Fe / CrCo56 / Cr5178 / / 90 Conrod pin / Bearings CuZn BearingsAlSnNa22 / Sb120m 949 / / 20 BearingsPbSnBi

Example – Activation of Cam & Tappet - 4 mm+ 4 mm Isotope: Co-57 e.g. 30 µm depth 1 – 5 MBq one or several cams activated Isotope: Co-56 e.g. 50 µm depth 10 MBq one or several tappets activated

RNT Measurement System

CMD – Concentration Measurement Device

FMD – Filter Measurement Device

RMD – Reference Measurement Device

Examples of RNT Tests Volkswagen 650h Test: / , h Test:505.01, Opel GM-LL-A-025; GEOS A/B BMW BMW Longlife-01/-04

Opel RNT Test Test Engine Gasoline Fuel Injection 4 cylinder 16 valve cm³ Power max : 100 kW Torque max : 185 Nm Test Criteria Online Wear Rate: Camshaft:max. 5 nm/h (cams 2, 5, 7 inlet activated, Co-57) Tappets:max. 2 nm/h (all 16 tappets activated, Co-56) Test Operation -Running in 15 h -Pre Test Reference 35 h -Variation of speed 56 h ( min -1 ) -Saw tooth 5 h (1000 min min -1 ) -Pitting 5 h (idle rpm / WOT) -Variation of oil temperature 12 h ( °C) -Post Test Reference10 h ____________________________ -Total138 h

VW RNT Test – Test Cycles Total test length 250 h Test 650 h Test

VW RNT Test – Online wear results [nm] hrs Oil Temperature Variation Tappet Wear Limit VW 250h Test Limit VW 650h Test Candidate Trends

Wear in relation to operational parameters Wear [mg] Oil Temp. [°C]Speed Wear Rate

Summary  RNT allows non-contact, continuous (online) wear measurements  RNT is applicable for all technical ferrous materials  RNT allows a selective measurement of critical zones  Up to two engine parts can be tested simultaneously regarding their wear behaviour  By means of RNT the wear behaviour of engine components in relation to critical running conditions can be evaluated  RNT allows wear measurements with a high measuring sensitivity (precision 1nm)

Institute for Fuels & Lubes Testing Thank you for your attention