82
Fig. 38
Fig. 39
Fig. 40
Fig. 41
Check the filter and replace if necessary. The valve
breathes into a rubber pipe (Fig 38). This may be open
to atmosphere (open type), or may be connected to the
carburettor intake (closed type) (Fig 39).
k)
TOP MOUNTED BREATHER
Fig. 40
1.
Element
2.
Baffle
3.
Oil return
4.
Pressure out
5.
Check valve
6.
Tube
A 4-cycle engine must be equipped with a crankcase
breather in order to maintain a partial vacuum in the
crankcase to prevent oil from being forced out of the
engine oil seals, past the piston rings or any gasket area.
This type breather is mounted to the top rear of the
cylinder block. The check valve allows excess pressure
to be vented through the element and out the tube.
Condensed oil vapour returns to the crankcase by means
of the oil return holes. Some engines have the breather
tubes connected to the air cleaner assembly.
The filter element can be cleaned using cleaning solvent.
When reinstalling the check valve, apply oil to aid
assembly.
NOTE - The check valve may expand if exposed to
solvents for a period of time. This swelling will prevent
correct operation of the breather.
NOTE - The breather body may be retained by two
screws, or may be a press fit into the crankcase. These
two types are not interchangeable.
l)
OIL SEAL REPLACEMENT (Fig 41)
If oil leakage is apparent it is possible to change the oil
seal with the crankshaft in position by the use of special
tools for the flywheel side and for the PTO side, 670292
and 670272.
Always fit new seals.
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