Attach the slide hammer to the bearing puller

method is attempted, first prepare a work surface which will enable the casing to be tapped face down to help dislodge the bearing - a wood surface is ideal since it will not damage the casing's gasket surface. Wearing protective gloves, tap the heated casing several times against the work surface to dislodge the bearing under its own weight (see illustration 5.8).

Tapping a casing face down on wood blocks can often dislodge a bearing

Drawbolt component parts assembled on a suspension arm

1 Bolt or length of threaded bar

2 Nuts

3 Washer (external diameter greater than tubing internal diameter)

4 Tubing (internal diameter sufficient to accommodate bearing)

5 Suspension arm with bearing

6 Tubing (external diameter slightly smaller than bearing)

7 Washer (external diameter slightly smaller

than bearing)

Drawing the bearing out of the suspension arm

• Toextract the bearing/bush you will need
a long bolt with nut (or piece of threaded bar
with two nuts), a piece of tubing which has an
internal diameter larger than the bearing/bush,
another piece of tubing which has an external
diameter slightly smaller than the bearing/
bush, and a selection of washers (see
illustrations 5.9 and 5.10).Note that the
pieces of tubing must be of the same length,
or longer, than the bearing/bush.

• The same kit (without the pieces of tubing)
can be used to draw the new bearing/bush
back into place (see illustration 5.11).

Temperature change

• Ifthe bearing's outer race is a tight fit in the casing, the aluminium casing can be heated to release its grip on the bearing. Aluminium will expand at a greater rate than the steel bearing outer race. There are several ways to do this, but avoid any localised extreme heat (such as a blow torch) -aluminium alloy has a low melting point.

• Approved methods of heating a casing are using a domestic oven (heated to 100°C) or immersing the casing in boiling water (see illustration 5.12).Low temperature range localised heat sources such as a paint stripper heat gun or clothes iron can also be used (see illustration 5.13).Alternatively, soak a rag in boiling water, wring it out and wrap it around the bearing housing.

Warning: All of these methods require care in use to prevent scalding and burns to the hands. Wear protective gloves when handling hot components.

• Bearings can be installed in blind holes
using the driver or socket method described
above.

Drawbolts

• Where a bearing or bush is set in the eye of
a component, such as a suspension linkage
arm or connecting rod small-end, removal by
drift may damage the component. Furthermore,
a rubber bushing in a shock absorber eye
cannot successfully be driven out of position. If
access is available to a engineering press, the
task is straightforward. If not, a drawbolt can be
fabricated to extract the bearing or bush.

Date: 2016-01-14; view: 1049