POWERHEAD
90-855347R1 JANUARY 1999 Page 4A-27
Cylinder Bores
1. Inspect cylinder bores for scoring, scuffing or a transfer of aluminum from piston to
cylinder wall. Scoring or scuffing, if NOT TOO SEVERE, can normally be removed by
honing. If a transfer of aluminum has occurred, an acidic solution such as “TIDY
BOWL CLEANER” should be applied to the areas of the cylinder bore where transfer
of aluminum has occurred. After the acidic solution has removed the transferred alu-
minum, thoroughly flush the cylinder bore(s) to remove any remaining acid. Cylinder
walls may now be honed to remove any glaze and to aid in the seating of new piston
rings.
HONING PROCEDURE
a. When cylinders are to be honed, follow the hone manufacturer’s recommenda-
tions for use of the hone and cleaning and lubrication during honing.
b. For best results, a continuous flow of honing oil should be pumped into the work
area. If pumping oil is not practical, use an oil can. Apply oil generously and fre-
quently on both stones and work area.
CAUTION
When honing cylinder block, remove hone frequently and check condition of cyl-
inder walls. DO NOT hone any more than absolutely necessary, as hone can re-
move cylinder wall material rapidly.
c. Start stroking at smallest diameter. Maintain firm stone pressure against cylinder
wall to assure fast stock removal and accurate results.
d. Localize stroking in the smallest diameter until drill speed is constant throughout
length of bore. Expand stones, as necessary, to compensate for stock removal
and stone wear. Stroke at a rate of 30 complete cycles per minute to produce best
cross-hatch pattern. Use honing oil generously.
e. Thoroughly clean cylinder bores with hot water and detergent. Scrub well with a
stiff bristle brush and rinse thoroughly with hot water. A good cleaning is essential.
If any of the abrasive material is allowed to remain in the cylinder bore, it will cause
rapid wear of new piston rings and cylinder bore in addition to bearings. After
cleaning, bores should be swabbed several times with engine oil and a clean
cloth, then wiped with a clean, dry cloth. Cylinders should not be cleaned with
kerosene or gasoline. Clean remainder of cylinder block to remove excess materi-
al spread during honing operation.
2. Hone all cylinder walls just enough to de-glaze walls.
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