Front Wheel Bearings With Oil-Filled Hubs - GMC T-Series 1999 Owner's Manual

Automatic Ether Injection System
(If Equipped)
If your diesel engine vehicle has this feature, the ether
cylinder is mounted on the outside of the passenger's
side frame rail at the rear of the cab.
To change an empty ether cylinder, follow these steps.
1. Loosen the 5/16 inch screw head on the
- -
cylinder to bracket clamp.
2. Spread the clamp apart.
3. Clean any dirt from the neck of the cylinder and the
top of the valve before you take out the cylinder.
4. Check the inside of the valve for any foreign matter.
Clean the valve as necessary.
5. Cover the valve to protect it from dirt and take out
the cylinder.
6. Install a new gasket whenever you take out the
cylinder. Use only one gasket and spread a light film
of clean oil on it before installation.
7. Put in the new cylinder. Turn it clockwise until it just
starts to contact the gasket.
8. Tighten the cylinder another one
(180 degrees). Don't overtighten.
-
9. Re tighten the cylinder clamp.
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Front Wheel Bearings with Oil-Filled Hubs

If there isn't, clean the rubber fill plug in the center of
the glass, and then remove it. Be careful not to allow
any dirt or water to get into the oil. Add enough oil to
bring it up to the level mark that you'll see on the glass.
Refer to your Maintenance Schedule for the proper oil
to use.
When you fill the hub, check the glass again after
driving a short distance. It takes a while for the oil to
-
half turn
flow through the system, and you may find that you
have to add a little more to fill it to the proper level.
-
If your vehicle has oil filled
hubs, check occasionally to
see if they have enough oil.
You can tell by looking into
the sight glass to see if there
is oil there.
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