Testing Crankcase And Cylinder Sealings - Yamabiko ECHO PB-2520 Service Manual

PB-2520
46
EB252
ENGINE

7-4 Testing crankcase and cylinder sealings

E
D
A
B
C
E
F
1. Remove carburetor.
2. To seal intake port and crankcase pulse pas-
sage, install pressure rubber plug 897826-16131
(A) and pressure plate 897827-16131 (B) with M5
bolts (C) of length 40-45 mm (1.6-1.8 in).
3. Loosen muf er bolts. And to seal exhaust port,
insert pressure rubber plug 91041 (D) between
muf er gasket and muf er as shown. Then retight-
en muf er bolts.
4. Remove spark plug and install pressure connec-
tor A131-000150 (E) to spark plug hole.
5. Connect pressure tester 91139 (F) to pressure
connector (E).
6. Apply pressure approx. 50 kPa (0.5 kgf/cm2) (7.3
psi) by pressure tester and leave for 30 seconds.
7. If the reading drops, leakage may occur.
8. Leakage may occur from crankcase seam or oil
seal. Use soapy water to locate leakage.
9. Then, apply negative pressure approx. 30 kPa
(0.3 kgf/cm2) (4.4 psi) by pressure tester and leave
for 30 seconds.
10. If the reading drops, leakage may occur from
oil seal. Inspect oil seal for damage or wear.
11. Remove pressure tester (F) and pressure con-
nector (E). Remove pressure rubber plug (A) and
rubber trapezoid (D).