OEM 2005 Scion tC Starter Motor

2005 Scion tC Starter Motor Parts Q&A

• Q: How to overhaul the starter motor on 2005 Scion tC?

  A: The starter motor overhaul starts by disconnecting the lead wire then removing its nut followed by unscrewing the two screws to disconnect the switch and afterwards eliminating the return spring and plunger from the starter drive housing. Unscrew the 2 bolts which allow you to remove the frame together with the starter yoke before eventually separating the commutator end frame from the yoke to extract the starter armature plate. A starter armature assembly requires initial use of a thin-bladed screwdriver to remove its cover which enables snap ring pliers to extract the snap ring and reveals plate washer and armature removal from commutator end frame. The removal of three planetary gears must follow after taking the starter drive housing apart. Check the starter magnetic switch assembly by testing plunger quickness then measure 1 Ohm or lower resistance from 50 to C terminals and 2 Ohms or lower from terminal 50 to the body. Replace the switch if necessary. The starter armature assembly examination requires resistance testing between coil segments (1 Ohm or less) and between each segment and its coil core should measure at least 10 MOhms. Commutator depth should also be checked with vernier calipers (expected measurement is 3.1 mm and maximum limit is 3.8 mm; if the depth exceeds the maximum threshold the armature requires replacement). The brush length measurement for the starter commutator end frame assembly must be between 9.0 mm and 4.0 mm (standard) while resistance tests at positive and negative terminals should exceed 10 MOhms (standard) in order to replace the frame. The inspection of the starter drive housing assembly requires clockwise clutch pinion gear rotation until a free spin occurs and lock engagement which demands housing replacement if required. Following clearance of the starter planetary gear and its pin parts you should apply lubrication before slotting each planetary gear into the planet shaft pin. The armature assembly preparation includes applying grease to plate washer, armature shaft, and new snap ring before inserting the armature with plate washer inside the commutator end frame under the snap ring. Verify and correct the assembly length (should not exceed 5.0 mm). Start by installing the starter commutator end frame cover to the starter commutator end frame followed by proper placement of the starter commutator end frame into the starter yoke. Then adjust the starter armature plate keyway position on the yoke keyway before applying gear grease to the armature gearing. Lock the starter yoke key properly within the starter drive housing keyway and tighten the 2 bolts to 6.0 N.m torque. Complete the starter magnetic switch assembly by lubricating its plunger and hook followed by housing the plunger with the return spring inside the drive housing while securely torquing the switch screws to 7.5 N.m then connecting the lead wire with its nut at 10 N.m torque.