Technical data

58
Repair instructions
Cylinder liner, honing
Honing pattern on cylinder liner bore
It is important that the cylinder liner should retain its
original honing pattern, for good lubrication and seal-
ing. The liner should therefore be honed if it has sur-
face scratches because of a ring seizure or dirt, or
has bright spots (polishing).
Honing with the cylinder liner in place is not recom-
mended, because of the risk of getting contamination
into the oil ducts and the difficulty of doing the mea-
surements correctly.
The cylinder liners have a honing pattern (see illustra-
tion), whose angles are carefully calculated to give the
optimum service life. When the bores are honed in
conjunction with piston ring replacement, the original
pattern should be followed to safeguard lubrication.
The honing scratches must be applied regularly and
cut evenly in both directions and over the entire cylin-
der.
NOTE! You must maintain the correct speed on the
honing tool to get the correct pattern.
1
Clean the removed cylinder liner from sooty edges.
Set the liner up in a vice.
Use a heavy electric drill which can be operated at low
speed, 200–400 rpm.
Use a Flex-Hone® tool with no. 80 grit.
NOTE! Do not use a honing tool with grinding stones,
since these machine the entire surface of the bore.
Lubricate the bore with thin engine oil before and dur-
ing honing.
After honing, it is very important that the cylinder
liner is carefully cleaned. Use hot water, a brush
and detergent (never paraffin or diesel oil).
Dry the liner with paper or a lint-free cloth. Oil the cyl-
inder liner with thin engine oil after drying.
Flex-Hone® is a registered trade mark of the Brush Research
Manufacturing Co. Inc.