Robin EY23 User Manual

11. TROUBLE SHOOTING
For a satisfactory starting and running conditions of a gasoling engine, the following three
requirements must be met:
1. The cylinder filled with a proper fuel-air mixture.
2. An appropriate compression in the cylinder.
3. Good spark at correct time to ignite the mixture.
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If all three requirements are not met simultaneously, an engine can not be started. There
are also other factors such as heavy load at starting and too long exhaust pipe causing high
back pressure, which contribute to hard starting. The most common causes of engine
troubles
are given below.
11-1 STARTING DIFFICULTIES
11-1-1 FUEL SYSTEM
1) 'No gasoline in fuel tank, or fuel cock closed.
2) Carburetor insufficiently choked, especially when engine is cold.
3) Water, dirt or gum in gasoline hindering flow of fuel to carburetor.
4) Inferior or poor grade gasoline not vaporizing satisfactorily to produce correct fuel mixture.
5) Needle valve in carburetor held open by dirt or gum. This condition is ascertained by
continuous fuel drip
from the carburetor during idling.
Sometimes, this trouble is remedied by lightly tapping
the float chamber with a screw driver
handle or the like.
6) Due to carburetor flooding, too much fuel introduced in the cylinder through cranking,
making the mixture too rich to be ignited.
When
this happens, remove spark plug and turn the engine over several times with starting
pulley to evacuate over-rich mixture through the plug hole. Keep carburetor choke open
during this operation. Dry spark plug thoroughly and reinstall, and try
to start again.
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11-1-2 COMPRESSION SYSTEM
When the fuel system and the ignition system are eliminated as the cause of starting difficulties
and
loss of power, the following are to be checked for possible lack of compression.
1) Cylinder dry after long interruption of operation.
2) Loose or broken spark plug. In this case, a hissing noise is audible, during cranking, made by
3) Damaged head gasket or slack cylinder head tightening. A similar hissing noise is produced
4) Tappet clearance incorrect. (See "6-3-8, 4) Tappet Adjustment'!)
If the compression is not recovered after correcting the above faults, the engine must be partly
dismantled and the foliowing must be checked.
1) Valve stuck open due to carbon or gum OR valve stem.
2) Piston rings stuck in piston due to carbon accumulation. Remove pistor! and connecting rod
escaping mixture gas in compression stroke.
during compression stroke.
from engine and clean, correct or replace parts.
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Robin EY23 Specifications

General

Brand	Robin
Model	EY23
Category	Engine
Language	English