Testing Crankcase And Cylinder Sealings - Echo PB-251 Service Manual

42
7-3 Checking muffler and exhaust port (continued)
(C)

7-4 Testing crankcase and cylinder sealings

(C)
(B)
ENGINE
(A)
(B)
(D)
(A)
3. Remove holders (B), gasket (A), and screen (C,
if present) from muffler.
4. Remove carbon deposits from screen, muffler,
and other component parts. If heavily deposited,
replace with new parts as required.
5. Reinstall muffler together with new gasket and
other removed parts.
1. Remove carburetor and muffler.
2. Close intake port and crankcase pulse passage
using pressure plug 897826-16131 (A) and pres-
sure plate 897827-16131 (B).
3. Close exhaust port with pressure plug 897826-
16131 (A) and install muffler.
4. Remove spark plug and install pressure connec-
tor 897835-16131 (C).
5. Connect pressure tester (D) to the connector and
apply approx. 0.2 kgf/cm
NOTE: Do not exceed 0.5 kgf/cm
to oil seals will result.
6. Gauge should indicate constant pressure at mini-
2
mum of 0.2 kgf/cm (3 psi).
NOTE: An air leak down rate of 0.05 kgf/cm
per minute is acceptable until the minimum holding
2
pressure of 0.2 kgf/cm
7. If the reading drops, use soapy water to locate
leakage. Leakage may occur from cylinder base,
crankcase seam, or oil seal.
8. Remove plugs from exhaust port and intake port
after this test, and reinstall all the removed parts in
place.
PB-251
2
(3 psi) of pressure.
2
(7 psi), damage
2
(1 psi)
(3 psi) is attained.