Briggs & Stratton Twin Cylinder L-Head, Repair Manual

Page: 119 / 171

8
4
Horizontal crankshaft twin cylinder engines manufac-
tured before 91080000 have a breather valve in each
cover assembly and two (2) breather tubes, Fig. 6.
Fig. 6 – Horizontal Crankshaft Models
Before Date Code 91080000
2 BREATHER
TUBES
2 BREATHERS
Vertical crankshaft twin cylinder engines have only one
breather valve and breather tube: for #1 cylinder,
Fig. 7.
Remove Breather
Before tappet and breather valve assemblies can be
removed for inspection, the air cleaner, carburetor and
intake manifold must be removed. See Section 3. On
horizontal crankshaft engines with two breathers, it is
necessary to remove the dipstick tube before the air
guide can be removed from #2 cylinder, Fig. 6.
Fig. 7 – Vertical Crankshaft Models (Typical)
BREATHER
TUBE
CYLINDER #1
BREATHER
Check Breather
If the fiber disc valve is stuck or binding, the breather
must be replaced. A .045” (1.14 mm) wire gauge
should not enter the spacer between the fiber disc
valve and body, Fig. 8.
DO NOT USE FORCE ON FIBER DISC.
Fig. 8 – Checking Breather
BREATHER
ASSEMBLY
SPARK PLUG
WIRE GAUGE
FIBER DISC
VALVE
.045”
(1.14 mm)
Installing Breathers – General
Install new breather gasket(s) with notches facing
crankshaft, Fig. 9.
Fig. 9 – Gasket Location
TOWARD
CRANKSHAFT
NOTCHES
IN GASKET