Testing Crankcase And Cylinder Seal - Echo shindaiwa CS-501SX Service Manual

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8-4 Testing crankcase and cylinder seal

A
D
E
K
ENGINE
B
C
D
E
F
G
H
J
CS-501SX, CS-501SXH
1. Remove cleaner lid, air fi lter and cylinder cover.
2. Disconnect fuel line, pulse line and choke rod
from carburetor, and remove carburetor from the
unit.
3. To seal intake port, install Pressure rubber plug
897826-16131 (A) between intake insulator and
carburetor, using carburetor screws (C). Install
Pressure plate 897827-16131 (B) between carbu-
retor and screw heads as spacer. Tighten screws
(C).
4. Loosen 4 muffler bolts. To seal exhaust port,
insert pressure rubber plug 91041 (D) between cyl-
inder exhaust port and muffl er gasket (E), until the
rubber plug covers exhaust port.
5. Tighten upper 2 bolts of muffl er.
6. Remove decompressor (F) and install plug
101115-37531 (G) and O-ring 900720-00009 (H)
as shown.
7. Connect pressure / vacuum tester 91149 (J) to
pulse line using provided pipe joint (K).
8. Apply pressure approx. 50 kPa (0.5 bar) (7.1
psi) by the tester (J).
9. If the pressure drops, leakage may occur.
10. Leakage may occur from crankcase seam,
cylinder base, oil seal and spark plug. Use soapy
water to locate leakage.
11. Apply negative pressure approx. 30 kPa (0.3
bar) (4.3 psi) by the tester (J).
12. If the pressure decreases, leakage may occur
from oil seal. Inspect oil seal for damage or wear.
13. Remove pressure / vacuum tester (J), pipe
joint (K) from pulse pipe. Remove pressure rubber
plugs (A) (D) and pressure plate (B) from intake
bellows and exhaust port. Remove plug (G) and O-
ring (H) and install decompressor (F).
501sx