Replacing Oil Seal; Checking Cylinder - Echo PB-251 Service Manual

PB-251

7-5 Replacing oil seal

7-6 Checking cylinder

ENGINE
(A)
(B)
(A)
1. Pry defective oil seal(s) from engine.
2. Lubricate a new oil seal on its circumference with
lubricant and push it in using an oil seal tool
897726-16431 (A).
NOTE: Since oil seal on starter side should be lo-
cated at 1 to 1.5 mm (0.04 to 0.06 in) deeper than
the crankcase surface, always use the washer
363018-00310 (B) or similar size of the washer
specified below, together with the oil seal tool.
Inner diameter : 12 mm (0.48 in)
Outer diameter : 19 to 22 mm (0.75 to 0.85 in)
Thickness : 1 to 1.5 mm (0.04 to 0.06 in)
NOTE: When installing oil seal, place it level to avoid
being cocked in bore.
1. Remove cylinder from engine.
NOTE: When removing cylinder except for the pur-
pose of replacing cylinder, leave ignition coil,
carburetor and muffler assembled to avoid extra
work.
NOTE: Gently tap cylinder with plastic mallet at car-
buretor and/or muffler sides of the cylinder head if it
is difficult to remove.
2. Inspect cylinder combustion chamber (A). Clean
with wooden or plastic scraper if carbon is depos-
ited.
NOTE: Never use metal scraper in cylinder com-
bustion chamber to avoid damage.
3. Replace cylinder with a new one if chrome plat-
ing is worn exposing cylinder base metal, peeled
away or scored.
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