Timing Chain Guide, Primary – Mopar (68487025aa)

Timing Chain Guide, Primary is part of the drive path between two shafts. Gears are lapped as a pair at the factory, which is why mixing a new gear with a worn mate usually produces noise.

Replace the Timing Chain Primary when backlash or tooth pattern is out of specification, or when the fluid carries metallic paste. Setting the pattern correctly on assembly matters as much as the part.

Reference number for the Timing Chain Primary: 68487025aa. It is filed under Camshafts & Timing, and it is the number that has to match the part coming off the vehicle.

The stock here is genuine MOPAR, and this Timing Chain Primary keeps the original engineering number, which matters once a number has been superseded more than once.