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KRYOTEC ENGINE
80
F. CYLINDER BORE DEGLAZING
Before deglazing, mask the crankcase area to
keep abrasive materials from entering the engine
lower end. Tape off any openings to prevent
abrasive material from entering the coolant and oil
circuits.
CAUTION
DO NOT use rigid type hones to remove cylinder
wall glaze.
1. Select an appropriate size flexible ball hone.
CAUTION
DO NOT use engine or transmission oil, mineral
spirits, or kerosene.
2. Deglazing of the cylinder walls may be done if
the cylinder bore is straight and round. About 20-
60 strokes, depending on the condition of the
cylinder bore, will be sufficient to provide a
satisfactory surface. Use a light honing oil,
available from major oil distributors.
3. Deglazing should be done by moving the hone
up and down fast enough to get a crosshatch
pattern. The hone marks should intersect at 30° to
60° inclusive angle for proper seating of rings.
4. A controlled hone motor speed between 200
and 300 RPM is necessary to obtain the proper
crosshatch angle (1). The number of up and down
strokes per minute can be regulated to get the
desired 30° to 60° inclusive angle (2). Faster up
and down strokes increase the crosshatch angle.
5. After deglazing, it is necessary that the block
be cleaned to remove all traces of abrasive. Use a
brush to wash parts with a solution of hot water
and detergent. Dry parts thoroughly. Use a clean,
white, lint-free cloth to check that the bore is
clean. Oil the bores after cleaning to prevent
rusting. Upon completion, perform a visual
inspection of the cylinder block passages to
inspect for abrasive debris. If any debris is found,
repeat the cleaning process.
NOTE
Cylinder bore diameter should not increase more
than 20 microns during deglazing process from
original nominal bore diameter, if the maximum of
20 microns is exceeded, the cylinder block must
be replaced. If deglazing the cylinder bore cannot
remove the light scratches and scuffs the cylinder
block should be replaced.