ENGINE
CS-310
54
8-4 Testing crankcase and cylinder seal
1. Remove cylinder cover, air filter and cleaner
case.
2. Remove carburetor from the unit.
3. To seal intake port, install pressure rubber plug
897826-16131 (A) between intake bellows and
carburetor, using carburetor screws (B). Tighten
screws (B).
4. Loosen 2 nuts of muffl er bolts. To seal exhaust
port, insert pressure rubber plug 91041 (C) be-
tween cylinder exhaust port and muffl er gasket (D),
until it bottoms.
5. Tighten nuts of muffl er bolts.
6. Remove spark plug and install pressure connec-
tor 897835-16131 (E) to spark plug hole.
7. Connect pressure tester 91024 (F) to pressure
connector (E).
8. Apply pressure approx. 9.8 kPa (0.1 kgf/cm
2
) (1.4
psi) by pressure tester.
NOTE:
Do not exceed 30 kPa (0.3 kgf/cm
2
) (4.3
psi). Otherwise, damage to oil seal may occur.
9. If the reading drops, leakage may occur.
10. Leakage may occur from crankcase seam or
oil seal. Use soapy water to locate leakage.
11. Then, apply negative pressure approx. 9.8 kPa
(0.1 kgf/cm
2
) (1.4 psi) by pressure tester.
12. If the reading drops, leakage may occur from
oil seal. Inspect oil seal for damage or wear.
13. Remove pressure tester (F) from pressure con-
nector (E). Remove pressure rubber plugs (A) and
(C) from intake bellows and exhaust port.
C
B
D
F
D
E
A
C
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