Commutator Test
WARNING: This page is about a different car, the 2004 Toyota RAV4 and 2003 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
- If commutator surface is dirty or burnt, it can be cleaned with No. 400 grit sandpaper or on a lathe.
- Place the commutator on V-blocks and use a dial indicator to measure runout (out-of-round). See Fig 1. If commutator runout is more than specification, turn commutator on a lathe and proceed to step 3. For specification, see STARTER SPECIFICATIONS .
- Measure commutator diameter. See Fig 2. If commutator diameter is less than minimum specification, see STARTER SPECIFICATIONS , replace armature.
- Ensure undercut depth between commutator segments are clean, free of debris, and that edges are smooth, and within specification, see Fig 3. If undercut depth is less than minimum, use a hacksaw blade to correct it. See STARTER SPECIFICATIONS .