Replacing Oil Seal; Inspecting Cylinder - Yamabiko ECHO PB-2520 Service Manual

PB-2520
EB252

7-5 Replacing oil seal

B
C

7-6 Inspecting cylinder

ENGINE
Oil seal section
Dust lip
Seal lip
A
0.5mm
1. Pry defective oil seal from engine.
NOTE: Be careful not to damage housing of oil
seal in crankcase.
2. Apply grease on dust lip and seal lip of new oil
seal (A) to avoid damage of lips while inserting
crankshaft into oil seal.
3. Lubricate circumferences of oil seal with thinner.
4. Push oil seal (A) by maximum 0.5 mm (0.02 in.)
deep using oil seal tool 897726-21430 (B) with
washer 10001-418430 (C) (size : innner dia.12.2 x
outer dia.20 x 0.5mm thickness).
.
1. Remove cylinder from engine.
NOTE: When removing cylinder solely for the pur-
pose of inspecting cylinder, leave ignition module,
and intake insulator to avoid extra work.
NOTE: Gently tap cylinder with plastic mallet at
carburetor and/or muf er sides of the cylinder head
if it is dif cult to remove.
2. Inspect cylinder combustion chamber and clean
with a plastic or wooden scraper if carbon is found.
NOTE: Do not use metal tools, or damage to cylin-
der wall may result.
3. Inspect cylinder wall and replace with new one
if plating is worn, peeled away, scored or exposing
cylinder base metal.
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