49
7
Crankshaft and crankcase
531 03 06-23
503 84 40-01
Adjustable fuel jets with
movement limiters
Exhaust gases
consisting of
Hydrocarbon (HC)
Nitrous oxide (NO
x
)
Carbon monoxide (CO)
Carbon dioxide (CO
2
)
Particles (PM)
Fuel/air mixture
consisting of:
92% air
8% petrol
Air consisting of:
21% oxygen
78% nitrogen
1% other
Fuel consisting of
Hydrocarbons (petrol)
Two-stroke oil (2%)
Fit the pressure test nipple (B) 503 84 40-01
in the spark plug hole.
Connect meter 531 03 06-23 and check
for leakage.
Fit the pressure test nipple (B) 503 84 40-01
in the spark plug hole.
Connect meter 531 03 06-23 to the
nipple and pump up a pressure of
50 kPa (0.5 kp/cm
2
) in the crankcase.
Max. permitted leakage: 20 kPa
(0.2 kp/cm
2
) per 30 seconds.
Connect meter 531 03 06-23 to the
nipple and lower the pressure in the
crankcase to 50 kPa (0.5 kp/cm
2
).
Max. permitted leakage: 20 kPa
(0.2 kp/cm
2
) per 30 seconds.
Any leakage can be difficult to localise
if the crankcase is depressurised.
When leakage has been established
with a vacuum, you can apply a slight
overpressure (0.1–0.3 kp/cm
2
) and at
the same time apply a layer of thin oil to
the joints and the sealing ring contact
surfaces on the crankcase to make leak
detection easier. Bubbles clearly mark
the position of the leakage.
Husqvarna E-Tech
In 1996 Husqvarna presented a new,
improved two-stroke engine as a part
of the company’s efforts to produce
engines that emit smaller amounts of
hazardous substances.
The new engine was given the
designation E-Tech and was first used
in a new brush cutter model.
More stringent environment regulations
in the USA, which primarily involve a
lowering of the hydrocarbons, nitrous
oxides and carbon monoxide content,
brought about the new engine design.
Environment degradation is reduced
through decreasing the amount of
unburned gases (flushing losses) in the
exhaust fumes.
Comparisons between an E-Tech
engine and an older engine design
show that the CO content has been
halved and the hydrocarbons and
nitrous oxide contents have been
reduced by close to 70%. In addition a
powerful increase in output is gained.
What makes the E-Tech engine design
unique is not a specific design solution
but rather several solutions interacting
to reduce flushing losses in the engine.
The carburettor’s job is to mix the air
and fuel in the right proportions to give
a combustible mixture, irrespective of
the speed and workload. The
carburettor’s adjustable needles have
been fitted with movement limiters to
prevent the engine from being run with
a too “rich” fuel/air mixture. (Also see
the “Fuel system” chapter).
Summary of Contents for 326C, 326L, 326LX-Series, 326LDX-Series
Page 1: ...Workshop manual 326R 326L 326C English ...
Page 31: ...30 4 Centrifugal clutch ...
Page 35: ...34 5 Angle gear ...
Page 45: ...44 6 Cylinder and piston ...
Page 51: ...50 7 Crankshaft and crankcase ...
Page 55: ...2004W38 114 03 03 26 ...
