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EXTENDED OIL FILL AND DIPSTICK
Horizontal Models 110000, 120000, 150000,
200000, 210000
These models use a plastic extended oil fill tube
and a quarter-turn dipstick. The oil fill tube
screws into the crankcase cover.
Vertical Models 90000, 110000, 120000,
210000, 280000, 310000, 330000
These models use a plastic extended oil fill tube
and a quarter-turn, dipstick. An o-ring seals the
tube in the crankcase cover and a retaining
bracket and screw secure it to the engine.
BREATHERS
Briggs & Stratton engines utilize a breather valve
to control and maintain crankcase vacuum. The
breather valve is a fiber disc or reed which closes
on the piston up stroke and opens on the piston
down stroke.
The breather is located on the cylinder or inside
the rocker cover, depending on engine model.
Service Breather - Horizontal Models
110000, 120000, 150000, 200000,
210000
Remove Breather
1. Disconnect breather hose (B, Figure 1)
from air cleaner.
2. Remove rocker cover with breather hose
(A) and gasket. Discard gasket.
Figure 1
Check Breather
1. Gently blow air into the breather tube.
There should be no air flow out the valve.
2. Apply vacuum to the breather tube. Air
should flow freely into the valve.
3. If air flow is restricted under vacuum at the
tube, or has no resistance when blowing
on the tube, replace the valve cover.
Install Breather
1. Securely insert breather hose into hole in
air cleaner base.
2. Place new gasket and valve cover on
cylinder head.
3. Install four screws and torque to values
listed in Section 12 - Engine
Specifications.
NOTE: Install three long screws on the sides and
bottom edges of valve cover. Install short screw
on top of valve cover.
4. Securely insert other end of breather hose
into hole in rocker cover.
Service Breather - Vertical Models
97700, 99700, 110000, 120000
Remove Breather
1. Remove two screws, breather assembly
(A, Figure 2) and gasket (B) from side of
cylinder. Discard gasket.
2. Remove four screws, breather passage
cover (C), and gasket (D) from top of
cylinder. Discard gasket.