46
ENGINE
CS-370ES
CS-420ES
7-4 Testing crankcase and cylinder sealing (continued)
4. Remove muffler. Install pressure rubber plug
897831-16131 (C) on exhaust port, then reinstall
muffler to seal port.
5. Connect pressure tester 897803-30133 (D) to
pulse line using pipe joint V186-000020 (E).
6. Apply pressure approx. 9.8 kPa (0.1 kgf/cm
2
) (1.4
psi) by hand pumping pressure tester.
NOTE: Do not exceed 30 kPa (0.3 kgf/cm
2
) (4.3 psi).
Otherwise, damage to oil seal may occur.
7. If the reading drops, leakage may occur.
8. Leakage may occur from crankcase seam and
oil seal. Use soap water to locate leakage.
9. Remove pressure tester (D), pipe joint (E) from
pulse pipe and pressure rubber plugs (A) (C) from
intake insulator and exhaust port.
7-5 Removing engine block
1. Remove starter assembly, cylinder cover, sprocket
guard and front handle from unit.
2. Remove air filter bracket and air filter. Disconnect
fuel return line and fuel inlet line from purge bulb
(Refer to “4-3 Replacing purge bulb”). Remove
switch bracket (Refer to “3-5 Replacing ignition
switch”). Disconnect fuel line and pulse line from
carburetor, and remove carburetor from the unit.
3. Remove flywheel (Refer to “3-10 Inspecting
flywheel and key”), clutch assembly (Refer to “5-1
Inspecting clutch parts”) and auto-oiler assembly
(Refer to “6-5 Inspecting auto-oiler assembly”).
4. Remove 4 bolts (D), securing engine block from
bottom of unit. Remove engine block with muffler
(A), ignition coil (B) and intake insulator (C) attached.
E
C
D
E
B
A
C
D
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