Echo CS-271T - Page 55

ENGINE
CS-271T
53
8-4Testingcrankcaseandcylindersealings
1. Remove air cleaner case.
2. Remove carburetor from the unit.
3. To seal intake port and crankcase pulse pas-
sage, install pressure rubber plug 89782616131 (A)
and pressure plate 89782716131 (B) with M5 bolts
(C) of length 15-20 mm (0.6-0.8 in).
4. Remove exhaust heat shield and mufer.
5. To seal exhaust port, assemble pressure rubber
plug 89782616131 (D) or rubber trapezoid 91041
between cylinder exhaust port and muffler as
shown.
6. Tighten mufer with mufer bolts (E).
7. Remove spark plug and install pressure connec-
tor A131000150 (F) to spark plug hole.
8. Connect pressure tester 91024 (G) to pressure
connector (F).
9. Apply pressure approx. 19.6 kPa (0.2 kgf/cm
2
) (3
psi) by pressure tester and leave for 60 seconds.
NOTE: Do not exceed 30 kPa (0.3 kgf/cm
2
) (4.3
psi). Otherwise, damage to oil seal may occur.
10. If the reading drops, leakage may occur.
11. Leakage may occur from crankcase seam or
oil seal. Use soapy water to locate leakage.
12. Then, apply negative pressure approx. 9.8 kPa
(0.1 kgf/cm
2
) (1.4 psi) by pressure tester and leave
for 60 seconds.
13. If the reading drops, leakage may occur from
oil seal. Inspect oil seal for damage or wear.
14. Remove pressure tester (G) and pressure con-
nector (F). Remove pressure rubber plugs (A) and
(D).
A
B
C
D
E
G
F