1-32
VACUUM-OPERATED ELECTRIC SWITCH (V.O.E.S)
ADJUSTMENT/TESTING
Timing Mark Method
Verify engine ignition timing. See IGNITION TIMING on
page 1-30. Adjust ignition timing, if necessary, and then per-
form the following V.O.E.S. check:
1. Run engine at regular idle. Disconnect V.O.E.S. vacuum
hose from carburetor fitting. See VACUUM-OPERATED
ELECTRIC SWITCH (V.O.E.S) in Section 7.
a. On world models, idle speed is 950-1050 RPM.
b. On California models, idle speed is 1150-1250 RPM.
2. Temporarily plug the open carburetor fitting. Ignition tim-
ing should retard (front cylinder advance timing mark dis-
appears from view in timing inspection hole) and engine
RPM should decrease.
3. Connect V.O.E.S. vacuum hose to carburetor fitting. Tim-
ing mark should reappear and engine speed should
increase to previous RPM.
If speed does not first decrease and then increase as
described, check V.O.E.S. wire connection to ignition module.
Ohmmeter and Vacuum Pump Method
The V.O.E.S. can also be checked using an ohmmeter and a
VACUUM PUMP (Part No. HD-23738).
1. Remove V.O.E.S. from vehicle. See VACUUM-OPER-
ATED ELECTRIC SWITCH (V.O.E.S) in Section 7.
2. See Figure 1-45. Connect two ohmmeter leads to the two
V.O.E.S. leads.
3. Connect vacuum pump to V.O.E.S. vacuum fitting.
4. Slowly squeeze vacuum pump handle. Observe vacuum
gauge and ohmmeter readings. Ohmmeter should indi-
cate switch closed (zero ohms) with an applied vacuum
of 5.0-6.0 in. (127.0-152.4 mm) mercury (Hg). If a vac-
uum reading of more than 6.0 in. (152.4 mm) Hg or less
than 5.0 in. (127.0 mm) Hg is required to close the
switch, then the switch must be replaced.
5. Install V.O.E.S. See VACUUM-OPERATED ELECTRIC
SWITCH (V.O.E.S) in Section 7.
Figure 1-45. Checking V.O.E.S. Using Ohmmeter
and Vacuum Pump
1. V.O.E.S.
2. V.O.E.S. leads
3. Ohmmeter
4. Ohmmeter probes
5. Vacuum pump
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