8. Read the toe-in from the scale, and compare it to
the toe-in specification in Group 33 of the
Business Class M2 Plus Workshop Manual.If
corrections are needed, refer to Group 33 of the
Business Class M2 Plus Workshop Manual for
instructions on adjusting the toe-in.
33–07 Steer Axle Hub Cap Vent
Plug Inspection
General Information
As a function of their design, hubcap vent plugs will
on occasion exhibit signs of hub oil on their exterior
surface. Depending on environmental conditions
and/or age of the plug, the amount of oil present can
vary. This is a normal result of the venting process
due to pressure increase within the hub cavity. For
an example of normal vent plug appearance, see
Fig. 13.
A vent plug can wear or be damaged and cause
excessive leakage, or allow water to enter the hub
and contaminate the oil. For examples of a leaking
vent plug, see
Fig. 14 and Fig. 15. Evidence of a
leaking vent plug may appear as;
• Oil splatter around the wheel
• Gooey/gummy oil around the vent plug purge
point
• Hub/plug area is dirty, and water contaminated
oil in the hub.
• Hub/plug area is clean, but there is water
contaminated oil in the hub. (pressure washing
is the most likely cause)
Inspection
NOTICE
Only remove vent plugs by hand. They can be
damaged if a tool is used. Wipe the hub/plug area
clean before checking the oil. Do not use a
pressure washer to clean the hub/plug area. The
plug has a vent and this can contaminate the oil
with water.
1. Park the vehicle on a level surface, shut down
the engine and set the parking brakes. Chock
the tires.
2. Inspect the axle hub cap and vent plug for
evidence of excessive leakage.
3. Wipe the hub cap and vent plug clean with a rag.
f400100a10/05/2016
Fig. 12, Setting Trammel Bar Pointers
f33029809/01/2016
Fig. 13, Normal Oil Venting
Front Axle 33
Business Class M2 Plus Maintenance Manual, 02/10/2023 33/7
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