Craftsman 143.991200 Specifications download pdf (Page 77)

CRANKCASE BREATHERS

The breather element and case can be cleaned using

cleaning solvent. Make sure the small drain hole or

holes are clean and installed down to allow return of

oil back into the crankcase.

Top Mounted Breather

This type of breather is mounted in the top and rear

of the cylinder block in vertical shaft engines. The

umbrella check valve allows positive pressure to be

vented through the element and out the tube. Most

engines have the breather tube connected to the air

cleaner assembly (diag. 44).

Late production OVRM engines use the rubber boot

and breather tube as a "pop in" design. Mark or note

the location of the breather tube. Use a large flat blade

screwdriver to pry the boot up and lift the breather

assembly out. Be careful not to drop the breather body

out of the rubber boot when removing (diag. 45).

A new breather tube boot is recommended for

replacement to assure proper crankcase seal. Apply

engine oil to the breather tube boot and push the

breather in until the top shoulder of the boot contacts

the crankcase.

OHH engines use an umbrella valve type breather

that is found in the rocker arm cover. Use solvent and

compressed air to clean the area if necessary.

Individual components are serviced only by the

replacement of the complete cover.

Side Mounted Breather

This type of breather mounts over the valve

compartment and uses a reed style check valve. Clean

the internal element or reed area with solvent and

compressed air if necessary. When installing, the drain

holes must be open and be on the bottom.

On OHV13.5 - 17 engines, align the reed valve and

plate parallel to the top surface of the breather opening

in the crankcase. If the plate has a notched corner,

install the notch toward the P.T.O. side of the engine.

If the plate is marked, install the plate with the mark

facing out. Hold the reed valve and plate in this

position while tightening the screw.

BODY

TUBE

COVER

GASKET

4746

FILTER

COVER

GASKET

DRAIN

HOLE

REED

BODY

PRESSURE OUT

OIL RETURN

BAFFLE

ELEMENT

TUBE

CHECK VALVE

UMBRELLA

BREATHER OUTLET

TO CARB

1 - Valve, Reed

2 - Plate, Limit

3 - Screw

4 - Baffle/Gasket

5 - Cover

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Craftsman 143.991200 Specifications Page 77

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