Briggs & Stratton 273521 Extended Oil Fill And Dipstick, Breathers, Vertical Models 90000, 110000

EXTENDED OIL FILL AND DIPSTICK

Horizontal Models 110000, 120000, 150000,	Vertical Models 90000, 110000, 120000,
200000, 210000	210000, 280000, 310000, 330000
These models use a plastic extended oil fill tube	These models use a plastic extended oil fill tube
and a quarter-turn dipstick. The oil fill tube	and a quarter-turn, dipstick. An o-ring seals the
screws into the crankcase cover.	tube in the crankcase cover and a retaining
	bracket and screw secure it to the engine.

BREATHERS

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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.

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