Linhai ATV 500-D T3 EFI, Service Manual

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CHAPTER 3 ENGINE
LH500ATV-D T3 EFI SERVICE MANUA 19.0
CHAPTER 3 ENGINE PAGE. 3- 133
output might occur possibly resulting in injury,
damage
the ignition component, and test equipment
DO : Take care when working around the ignition
system.
The high voltage produced by the coil secondary
circuit can cause personal injury and/or damage test
equipment
DO : Proper handling and shipping methods need
to
be in place to reduce the risk of damage due to
impact, moisture, or contamination
Damaged components can lead to premature failure.
DO : Avoid unnecessary disconnecting and
connecting of the electrical components.
The electrical connections are not designed for
repeated connection and disconnection.
DO : Insure the low voltage connectors are entirely
seated and the locking mechanism is engaged.
This prevents intermittent electrical connections
leading to an improper ignition system operation.
DO : Use approved connector breakouts when
testing the ignition system.
Connector and/or component damage may occur.
DO : Insure the appropriate seals are included in
the connector system.
Liquid intrusion into the terminal connection area
might occur causing an electrical intermittent or short
condition. In the event of severe terminal corrosion,
an open condition might occur.
DO : Operate with gasoline based internal
combustion engines.
Other fuels or combustion designs may require
additional design considerations
DO : The power feed line should be fused. This could protect the system in the event of an
electrical short
DO : The module heat sink and back plate must not
be used as a connection point when jump starting
the engine
The high level of voltage and current which the
module could be subjected to, could cause module
performance degradation or failure.
DO : Connection of the module back plate to
vehicle ground is desirable whenever possible
This greatly reduce potential ground loops and acts
as a heat transfer source from the module.
DO : The ignition system ground wire should be
kept as short as possible. And, when permissible,
should be grounded at the same engine block
position as the engine controller
This would greatly reduce the possible of unwanted
electrical ground loops.
DO : The electrical wiring to the ignition system
should be routed so that the conductors are
protected from excessive heat, damage, and wear.
Helps prevent electrical intermittent, open or shorted
operating conditions.
DO : Ignition secondary leads should not be routed
with the ignition primary harness or any other
electrical harness.
Voltage spikes can be transmitted from the
secondary
cables into other leads which are in close. This could
create a component performance degradation or
failure condition
DO : Spark plug wires(secondary leads) & primary
wiring:
- must not contact sharp surface
- must not be under tension between fixed points
- must be clear of moving parts (belts, fan, etc…)
- must be protected from or kept at least 125 mm
away from radiant heat source exceeding 400 F.
- must be protected from environmental damage
(dirt, splash, oils, fluids, etc….)
- must be retained, secured or insulated to prevent
pinching, mis-routing, rattles, and squeaks
- Spark plug wires carry very high voltage (30,000
volt). If the secondary lead loses its dielectric
characteristics thru being nicked, cut , chaffed, then
an arc thru to a near by ground could take place. This
kind of condition could lead to misfire, no start, or
premature failure of ignition system.
DO : Not all fasteners are designed for repeat use.
Beware of fastener specifications. All harnesses
should be supported within 6" of a mating
connection.
Adequate retention force might not be achieved if the
fastener is not designed to be reused. Mating
connections are not designed to support the weight
of the harness assembly
DO : For removing spark plugs follow the following
steps:
1- Grasp the spark plug boot and gently rotate
90; and then pull the spark plug boot and
cable away from the spark plug
2- Before removing spark plug, brush or air blast
dirt away from the well areas
3- Use correct size deep socket wrench to loosen
each spark plug one or two turns
To remove spark plugs from Aluminum heads, allow
the engine to cool. The heat of the engine, in
combination with a spark plug that is still hot, may
cause the spark plug threads to strip the cylinder
head
upon removal
Use goggles to protect eyes from dirt when applying
compressed air to spark plug wells
DO : Cleaning a spark plug could be done as follow:
1- wipe all spark plug surfaces clean….remove
- Cleaning a spark plug will reduce the voltage
required for an electrical arc(spark) across the