Breather Systems; Breather System; Remove/Replace Breather System (10470 0); Breather System (26070 0, 261700) - Briggs & Stratton Vanguard 05000 Manual

BREATHER SYSTEMS

Briggs & Stratton engines use a breather valve to
maintain and control a pulsating vacuum in the
cylinder or sump. The vacuum helps to control oil
leakage past piston rings, valve guides, oil seals,
governor lever shaft and gaskets.
The breather valve is a fiber disc or reed that
closes on the piston's up stroke and opens on
the piston's down stroke.

Breather System

(050000, 085400, 086400, 115400,
117400, 118400, 138400, 185400,
235400, 245400)
Remove Valve Cover
1. Remove screws (A) fr om valve cover, Fig.
22.
2. Remove valve cover and gasket(s).
Fig. 22
The breather components are built into the valve
cover for the models listed. They consist of (A) a
port for the breather hose, (B) a reed and valve
assembly inside the cover and ([C] Fig. 23) a
relief hole to balance cylinder pressures in case
the breather asse mbly sticks or binds.
Fig. 23
To check breather assembly:
1. Cover relief hole with thumb.
2. Blow into the breather port hole - air
should not pass.
3. Inhale through the breather hose port - air
should pass freely.
Replace valve cover if any binding or sticking is
discovered.
Remove/Replace Breather System
(104700)
1. Remove air cleaner cover, flywheel brake
cover (if equipped), blower housin g, rope
starter, and flywheel. SEE SECTION 1-
AIR CLEANER SERVICE.
Fig. 24
3
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