Aftermarket June 2022

BY Damien Coleman, Product Manager/ EBI Specialist at Snap-on A 2016 Nissan NV300 with the 1.6L common rail diesel Injection engine (R9M) had a clutch and flywheel replaced due to general wear and tear. There was a judder evident through the clutch pedal when releasing the clutch and a loud rumble could be heard from the transmission when starting and switching off the engine. The transmission and clutch assembly were removed and the dual mass flywheel (DMF) inspected. Both rotational travel and bearing axial load was measured. The axial load was less than 1mm however the rotational travel of the secondary mass with respect to the primary mass exceeded 15 degrees of rotation. This indicated the arc springs were excessively worn. Please refer to thee sectioned view of a DMF as seen in Fig.1. Once the flywheel and clutch assembly was replaced the engine was cranked over but failed to start. The following fault code was retrieved from the engine management system: DF003 - Camshaft/engine speed sensor consistency’. This indicated an issue with the relationship between the camshaft position and crankshaft position. It should also be noted that the fault code cleared with the key on, engine off. This was an indication that the issue is only present when the engine is cranking. Normally a wiring fault will not clear or the code will return once the ignition is cycled. 40 AFTERMARKET JUNE 2022 TECHNICAL/SNAP-ON www.aftermarketonline.net RIDE THE COMMON RAIL In this issue, Damien has rolled up his sleeves to deal with a problematic common rail diesel injection engine 1) Primary Mass. 2) Secondary Mass. 3) Centre Bearing. 4) Arc Springs. 5) Torsional Springs. As this engine has a phonic wheel form crankshaft position on the flywheel, it was prudent to start with a Cam/Crank relationship test using the oscilloscope.