CS-350WES
46
SAW CHAIN LUBRICATION SYSTEM
7-4 Testing crankcase and cylinder sealing
1. Remove air cleaner, carburetor and starter
assembly with front handle.
2. Install pressure plate (C) on intake port of rear
handle.
3. Remove muffler and close exhaust port with duct
tape (D) as shown and install muffler.
4. Screw pressure connector (A) in thread of spark
plug hole and connect pressure tester (B).
5. Apply pressure approx. 9.8kPa (0.1kgf/cm
2
) by
hand pumping of the pressure tester (B).
NOTE: Do not exceed 30kPa (0.3kgf/cm
2
), or
damage to seals will result.
6. If the reading drops, leakage may occur.
7. Leakage may occur from crankcase seam and
oil seal. Use soapy water to locate leakage.
8. Remove all plugs and tape from exhaust port and
intake port, and pressure connector.
7-3 Testing cylinder compression
NOTE: Test the cylinder compression when engine
is cold.
1. Move ignition switch to STOP position.
2. Remove spark plug.
3. Install a compression gauge 91007 (A) into spark
plug hole and pull starter several times to stabilize
reading.
4. If the pressure is lower than approx. 80% of
standard compression pressure (refer to “1-2
Technical data” Emission applicable models 90%),
check cylinder bore, piston, and piston ring if worn
or damaged.
5. If the pressure is more than approx. 130%
(Emission applicable models 120%) of standard
compression pressure, check cylinder combustion
chamber and exhaust port, piston crown, and muffler
for carbon deposits.
NOTE: Compression pressure varies with the
volume of compression gauge tip occupying in
cylinder combustion chamber. If the volume of the
gauge tip is considerably different from the spark
plug, it is recommended to measure and note
compression pressures of brand-new engines as
standard pressure in advance.
A
A
D
C
B
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