Takeuchi TB 175 Handbuch Seite 787

Point6
1)Removing pipe seals of 4 valve head.
[Disassemble]
• Take off a rocker arm cover in case of 4 valve head
after removing fuel injection pipes and pipe seals.
[NOTICE]
Attention is necessary because a fuel nozzle is caught
in a pipe seal and the pipe seal is damaged when a
rocker arm cover is lifted with a pipe seal sticking to
the rocker arm cover.
• Insert a minus driver in the slit part of the rocker arm
cover, and remove it when removing a pipe seal.
[Reassemble]
• Replace the used pipe seal with a new one when
removing a pipe seal.
2)Breather system (A redactor to intake air system of
blowby gas)
Emitting blowby gas is harmful to natural environ-
ment. Therefore blowby gas redactor is adopted to
TNV series naturally- aspirated engines as breather
system (Turbocharged engines emitblowby gas).
The system of model 3/4TNV84 is shown as a repre-
sentative of that breather system in the right figure.
Some of the combustion gas passes through the
clearance between the cylinder and the piston, pis-
ton ring, and flows to the crankcase. This is said as
blowby gas. While it passes into the cylinder head
and the rocker arm cover, the blowby gas mixes with
splash oil, and becomes oil mist-blowby gas mixes
with splash oil, and becomes oil mist-blowby gas it
passing through the baffle plate inside a rocker arm
cover. And it passes through a diaphragm assy, and
a intake manifold, and is reduced in the combustion
chamber. Pressure inside a crankcase is controlled
by the function of the diaphragm assy, and suitable
amount of blowby gas is reduced in intake air sys-
tem.
[Disassemble]
When a rocker arm cover is taken off, check whether
oil or the like enter the diaphragm space from a small
hole on the side of a diaphragm cover or not without
disassembling the diaphragm.
4. Disassembly, inspection and reassembly of engines
Cap nut of fuel injection pipe
Center plate
Diaphragm
Breather pipe
Breather system componert
Blowby gas flow
Blowby gas flow
to diaphragm
space
73
Pipe seal
Fuel injection pipe
Fuel nozzle
Slit of bonnet
Pipe seal
Minus driver
Pipe seal replacement
Spring
Diaphragm cover
Rocker arm cover
Intake
maniforld
Baffle plate
Cover
Spring
Diaphragm
Center plate
Rocker arm
cover
Baffle plate
Diaphragm part
Blowby gas flow
Breather
baffle