LUBRICATION
41
Lubrication system
MTD uses a splash lube system for it’s horizontal shaft
engines. The connecting rod has a dipper on it that
“splashes” oil around the inside of the engine.
See Figure 5.7.
NOTE: The cam and tappets were removed for
better visualization of the lubrication system.
The splashing action will also atomize or change the oil
into a mist. There are two oil passages that run along
the engine cylinder. The one on the top side of the
engine is the oil supply passage. The oil mist will flow
through this passage to the cylinder head. See Figure
5.8.
Figure 5.7
Dipper
Figure 5.8
Oil supply passage
Oil return
Tappets
The second oil passage runs along the bottom side of
the cylinder. This is the oil return passage. As the name
implies, it allows the oil collecting in the cylinder head
to return to the sump. The return passage is the tiny
hole that is in between the two tappet passages.
NOTE: Because these engines use splash lubri-
cation, the type of oil and the oil level is critical
for proper operation of the engine. If the oil level
is too low, the dipper on the connecting rod can
-
not splash the oil into the engine. If the oil level is
too high, the oil will not change into a mist to
reach the upper side of the engine.
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