What are the methods to determine piston slap?
1 Answers
Methods to determine piston slap are introduced as follows: 1. Cylinder cut-off test: Use the cylinder cut-off method to identify the location of piston slap. If the noise significantly decreases or disappears when cutting off fuel to a certain cylinder, and a distinct "tapping" sound is heard when fuel supply is restored, it indicates piston slap in that cylinder. 2. To further confirm piston slap in that cylinder: Remove the fuel injector of that cylinder, add a small amount of CD-grade turbocharged engine oil (for sealing purposes) into the cylinder, then reinstall the injector. Start the engine - if the knocking sound disappears or weakens, but reappears after running for a while, this undoubtedly confirms piston slap in that cylinder.