227
POWERHEAD
CYLINDER BLOCK CLEANING
11
CYLINDER BLOCK
CLEANING
IMPORTANT: Before inspecting or assembling
powerhead, all internal components must be com-
pletely clean and free of contaminants.
Remove any carbon accumula tion from exhau st
port areas.
Remove any carbon accumulation from cylin der
head combustion chambers.
If cylinder walls are glazed from extende d use,
use a rigid, medium grit cylinder hone to resurface
walls. Use slow RPM for best oil retention and ring
sealing. W hen finished, a cro ss hatch p attern of
22 to 32° sh ould be visible in the cylinder wall.
The pattern should be uniform in both directions.
IMPORTANT: To avo id piston or cylind er block
damage, restore the chamfer to all port edge s
using a ball hone or other suitable tool.
Use Gel Seal and Gasket Remover to remove all
traces of ga skets, adhesives, and Gel-Seal II™
sealant from the cylinder block and crankcase.
Carefully rem ove an y carbon ac cumulation from
the tops and ring groo ves of the piston usin g
Engine Tuner. A ring groove cleaning tool can b e
made by brea king an old ring and grind ing a n
angle on it s end. Do not damage ring grooves
while cleaning.
Thoroughly wash en tire cylinder block and crank-
case with warm, soapy water to remove all traces
of contaminants.
Air dry cylind er block and crankcase. Blow all
holes and passageways with compressed air.
Cover the cylinder walls with a libera l amount of
outboard lubricant to prevent corrosion.
1. Crosshatch pattern in cylinder wall
2. Chamfered port edge
002067
A WARNING
To avoid personal injury, wear eye protec-
tion an d rub ber gloves when usin g Gel
Seal and Gasket Remover.
TYPICAL 34861
A WARNING
To avoid personal injury, wear eye protec-
tion and se t compres sed ai r p ressure at
less than 25 psi (172 kPa).
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