Honing Procedures - Evinrude 4906B 4HP 1969 Owner's Manual

carbon with a fine wire brush on a shaft
attached to an electric
remover solution.
Use an inside micrometer
gauge and micrometer
ders for wear. Check the bore for out-of-
round and/or oversize
tapered, out-of-round
0.003" - 0.004" (0.076 mm - 0.102 mrn) the
cylinders should be rebored
pistons and rings installed.
GOOD WORDS:
Oversize piston weight is approximately
the same as a standard
fore, it is NOT necessary
cylinders in a block just because
der requires reboring.
Power Boat Association)
mits the use of 0.015" (0.381 mrn) oversize
pistons.
Hone the cylinder
the new piston rings,

Honing Procedures

If the cylinders have been scored,
not out-of-round or the
clean the surface of the
cylinder hone as described
dures, next section.
SPECIAL WORD
Cylinder sleeves
some models, but the cost is very high.
Resurfacing a cylinder
drill or use a carbon
or telescopic
to check the cylin-
bore. If the bore is
or worn more than
and oversize
size piston. There-
to rebore
one cylin-
The APBA (American
accepts and per-
walls lightly to seat
as outlined in the
Section in this chapter.
but are
sleeve is rough,
cylinder with a
in Honing Proce-
may be installed
wall using a honing tool.
HONING PROCEDURES
To ensure
ance and long life following
work, the honing work should be performed
with patience,
sequence:
a- Follow
commendations
cleaning and lubricating
operation.
b- Pump a continuous
into the work area.
practical, use an oil can.
generously and frequently
all and work surface.
c- Begin
diameter.
against the
stock removal and accurate
Expand
d-
compensate
wear. The best cross-hatch
tained using a stroke
cycles per minute.
oil generously.
e- Hone the cylinder walls ONLY enough
to de-glaze the walls.
After
f-
completed,
water and detergent.
on
stiff bristle brush and rinse thoroughly
hot water.
well as a prevention
material remaining
Such material
piston rings, the cylinder bore, and the bear-
ings.
g- After
eral times with engine oil and a clean cloth,
and then wipe them dry with a dean
NEVER use kerosene or gasoline to clean the
cylinders.
h- Clean the remainder
block to remove any excess material
during the honing operation.
WORDS OF ADVICE
If new rings are to be installed,
from the package MUST be checked
cylinder. Errors happen.
can make mistakes.
be included
part number.
Therefore,
time as follows:
lower it a couple inches into the cylinder
CYLINDER BLOCK
satisfactory engine perform-
the overhaul
skill, and in the
the hone manufacturer's
for use of the hone and for
during the honing
flow of honing oil
If pumping
Apply the oil
on both the stones
the stroking at the smallest
Maintain a firm stone pressure
cylinder wall to assure
results.
the stones as necessary
for stock removal
pattern
rate of 30 complete
Again, use the honing
the honing operation
clean the cylinder bores with hot
Scrub the walls with a
The cylinders MUST be cleaned
against any abrasive
in the cylinder
will cause rapid wear of new
cleaning, swab the bores sev-
of the cylinder
Men and machines
The wrong size ring can
in a package with the proper
check EACH ring, one at-a-
Turn the ring sideways and
3-29
following
re-
is not
fast
to
and stone
is ob-
has been
with
bore.
doth.
spread
each ring
in the