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BRUSCHCUTTERS DS 2200 - DS 2400
pag.
1
Workshop manual
12. PISTON FAILURE ANALYSIS
Bad fuel-oil ratio: insufficient quantity of oil (1)
b. Incorrect oil: bad oil or oil for outboard, diesel, 4-stroke
engines; does not lubricate enough the engine (2)
Lean carburetor adjustment: incorrect air/fuel ratio (4)
Worn, damaged or missing air fi lter: dust particles and
water go through the engine causing faster wear or
components failure (6)
Overheating: obstructed cylinder fi ns, blocked air cooling
flow (5)
Pre-ignition, detonation: fuel with low octane level or old
fuel, wrong sparkplug thermal grade, defected ignition
system and carbon deposit (7)
Air leaks: from engine, crankshaft seals, crankcase gasket,
impulse tube, leaning fuel mixture and make the engine
work over speeding, as a wrong carburetor adjustment
does (3)
Oxygenated fuels or with alcohol/ethanol content: clean
fuels are formulated with higher levels of oxygen, which can increase combustion chamber temperatures and pressure, the
consequences are similar to a unit which has very lean setting (3, 4, 7)
Old fuel or fuel with low octane level: it does not burn properly creating an excessive pressure on internal components
(7)
Dirty fuel filter: it stops the fuel going inside carburetor and the engine works using too much air. Carburetor inspection
and cleaning is suggested (3)
Carbon deposit: excessive carbon deposits can build up and seize the piston. The rings can stick because of oil carbon
allowing gases to pass the piston and cause exhaust side seizures (2)
a.
b.
c.
d.
e.
f.
g.
h.
i.
l.
m.
Содержание DS 2200 S
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