NOTE: This procedure applies to engines with timing chains,
on which the oil seal is located in the front cover, rather than in the oil
pump.
NOTE: The front cover oil seal can be replaced, in most cases,
without removing the front cover.
- If necessary, drain the cooling system and remove the radiator, to provide
sufficient clearance. This step should not be necessary on front wheel drive
GLC models.
- Remove the drive belts.
- Unfasten and remove the crankshaft pulley.
- With a small prytool, carefully pry the seal out of the timing chain cover.
- Clean the seal bore out thoroughly. No dirt or grease should be allowed
to remain inside the bore, since such foreign matter will cause premature
failure of the new oil seal.
To install:
- Coat the lip of the new seal with engine oil. Using a piece of pipe or a
socket slightly smaller than the bore of the oil pump (and about the diameter
of the seal itself), tap a new seal into place. Position the seal so its front
edge is aligned with the front edge of the timing chain cover.
- Apply sealant to the pulley side of the bolt, then position and install
the crankshaft pulley. Torque the crankshaft pulley bolt to 80–87 ft.
lbs. (110–120 Nm) for the GLC, or 101–108 ft. lbs. (140–150
Nm) for the 626.
- Install and properly tension the drive belts.
- If applicable, install the radiator and fill the cooling system to the proper
level.
