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Cylinder Servicing | Up
Construction Mechanic Advanced - Construction methods and practices | Next
Piston and Rings Servicing |
In honing, two sets of stones—coarse and
fine-are generally used along with honing oil or
cutting fluid. If a lot of material must be removed,
start with the coarse stones. You must leave
sufficient material, however, so that the rough-
honing marks can be removed with the fine stones.
The final honed size must equal the size of the
piston and rings to be installed.
During the final honing stage, occasionally
clean the cylinder walls and check the piston size
to guard against removing too much material or
honing the cylinder oversize.
Honing is sometimes used to “break” or
“crack” the glaze on cylinder walls when new
rings are installed. The idea behind this is to
remove the smooth glaze that has formed on the
cylinder walls, thus giving the new rings a change
to set quickly.
CYLINDER LINERS REPLACEMENT
Using replaceable cylinder liners can save time
and costly machine work. First, determine the
type of liners—wet or dry—that are used in the
unit being rebuilt. Dry liners do not require a
water seal and can simply be pulled out (fig. 3-31)
and the new liner pressed into place. Wet liners
have grooves cut into them (fig. 3-32) for fitting
O-ring seals to prevent water leakage into the
crankcase.
CAUTION
When installing the wet type of liners
(fig. 3-33), use care to prevent damage to
the O-ring seals.
Figure 3-32.—Wet type of cylinder liner.
Figure 3-33.—Cylinder liner installation.
Figure 3-31.—Cylinder liner removal.
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