Tennant 365, Руководство оператора

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MAINTENANCE
365 MM173 (3---90)
3-28
DISTRIBUTOR IGNITION TIMING (For machines
below serial number 007000)
The distributor ignition timing must be checked with
a timing light, using the timing points located on the
front of the engine and the timing marks located on
the crankshaft pulley. Distributor ignition timing
should be checked after the first 50 hours of
operation and after every 400 hours of operation
thereafter.
To check and adjust the ignition timing with a scope,
refer to the scope manufacturer’s instructions. To
check and adjust the timing with a timing light,
proceed as follows:
TO CHECK AND ADJUST DISTRIBUTOR IGNITION
TIMING (For machines below serial number 007000)
NOTE: Dwell angle must be correct or timing will not
be accurate.
1. Stop the engine and set the machine parking
brake.
FOR SAFETY: Before leaving or servicing
machine; stop on level surface, set parking brake,
and turn off machine.
2. Clean and mark the timing marks.
NOTE: Painting a white line on the front pulley timing
marks will make them easier to see under the timing
light.
3. Disconnect and plug the vacuum hose from the
distributor.
A
B
00696
ENGINE TIMING MARKS
A. Timing Pointer
B. Crankshaft Pulley
4. Connect the timing light to the No. 1 cylinder
spark plug wire. Connect a tachometer to the
engine.
FOR SAFETY: When servicing machine: avoid
moving parts. Do not wear loose jackets, shirts,
or sleeves when working on machine.
5. Start the engine and reduce the idle speed to
600 rpm to be sure that the centrifugal advance
is not operating. Adjust the initial ignition timing
to 10
_
to 12
_
BTDC on gasoline engines,
and 12
_
to 14
_
BTDC on LPG engines.
To advance the timing, turn the distributor body
clockwise. To retard the timing, turn the
distributor body counterclockwise.
6. Check the centrifugal advance for proper
operation by starting the engine and
accelerating it to approximately 2000 rpm. If the
ignition timing advances, the centrifugal
advance mechanism is functioning properly.
Note the engine speed when the advance
begins and the amount of total advance. Stop
the engine.
7. Unplug the vacuum line and connect it to the
distributor vacuum advance unit. Start the
engine and accelerate it to approximately 2000
rpm. Note the engine speed when the advance
begins and the total amount of advance.
Advance of the ignition timing should begin
sooner and advance farther than when
checking the centrifugal advance alone. Stop
the engine.
8. If the vacuum advance is not functioning
properly, remove the distributor and check it on
a distributor tester.
9. After adjusting timing, be sure to increase the
engine idle speed to its normal setting.