Draper 35891 handleiding
Handleiding
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6. Operations
6.3 Ignition System Vacuum Advance
On standard points and some electronic ignition systems
there are two types of advance methods used, both of
which must function correctly to obtain maximum
performance and fuel economy.
• Mechanical/Centrifugal(Weightslocatedinthe
baseofthedistributor)- the weights move outwards
advancing the ignition timing as the engine RPM
increases. This is tested by disabling the system by
removing the vacuum advance line. Then with a
timing light connected, raise the engine RPM,
checking that the timing advances in accordance with
the manufacturer’s specication.
• VacuumAdvance(Engineloadsensedviamanifold
vacuum) - A vacuum diaphragm is mounted onto the
distributor and connected to a rotating internal base
plate which advances or retards timing as required to
suit varying engine loads.
a. To test this system for correct operation, connect a
timing light, raise the engine RPM and check the
timing advance against the manufacturer’s
specication. If the vacuum advance is not
operating, remove the vacuum line from the
distributor advance mechanism. Connect the
vacuum tester and create a 5-10inHg vacuum,
monitoring the timing at the same time. If a timing
advance is noted this conrms that the vacuum
diaphragm and mechanical links are in order and
that the fault is a vacuum supply.
b. To conrm this, connect the vacuum tester to the
vacuum supply line and check the gauge reading.
No vacuum should be noted at idle but when the
engine RPM is increased a vacuum increase should
be observed. If this does not occur, trace the
vacuum line back checking for restrictions and
breaks.
– 9 –
EN
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Productinformatie
| Merk | Draper |
| Model | 35891 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 1727 MB |
