Chevrolet 10 Series 1967, Service Manual

Page: 376 / 605

ENGINE-ELECTRICAL 6Y-28
F ig . 18i— Installing Seals in G o ve rn o r Distributor
GOVERNOR SETTING
Since governor speed is a function of both the distribu­
tor “ spinner” and the carburetor actuator, the only
positive method of accurately setting speed is to adjust
the spinner on the vehicle.
If an approximate bench setting of the spinner is de­
sired, the following procedure can be followed:
1. With “ spinner” valve adjusted so that at least two
threads on the valve are showing behind the nut,
mount the distributor in a tester.
2. Screw vacuum adapter into lower vacuum opening
on the distributor housing.
3. With the vacuum hose pinched or bent double to pre­
vent leakage through the hose, adjust vacuum so that
gage reads 5.0 inches. Replace hose, then repeat
F ig . 19i—Distributor G overnor Assembly
F ig . 2 0i—A d vance W eights Installed
adjustment until reading returns to
5 .0
each time the
hose is pinched.
4. Attach vacuum hose to the adapter on the distributor
and start tester. Increase speed until the vacuum
reading reaches a maximum value. This maximum
value will vary, depending on the type “ spinner”
parts used, but will probably be above 3.8” hg.
5.
After this maximum reading has been reached,
slowly decrease the distributor speed until the vac­
uum gauge hand falls back .1" hg. The speed at which
this .
1
" hg. drop occurs will be the approximate no
load governed speed. (Remember that distributor
rpm is half engine rpm when making this adjustment.)
INSTALLATION—ENGINE NOT DISTURBED
(ALL MODELS)
1. Turn the rotor about 1/8 turn in a clockwise direc­
tion past the mark previously placed on the distrib­
utor housing to locate rotor.
2. Push the distributor down into position in the block
with the housing in a normal “ installed” position
(figs.
2 1
i and
2 2
i).
NOTE:
It may be necessary to move rotor
slightly to start gear into mesh with camshaft
gear, but rotor should line up with the mark
when distributor is down in place.
3. Tighten the distributor clamp bolt snugly and connect
vacuum line. Connect primary wire to coil terminal
and install cap. Also install spark plug and high
tension wires if removed.
NOTE:
It is important that the spark plug
wires be installed in their proper location in the
supports (fig. 23i).
4. Time ignition as previously described under Tune-Up
in Section
6
.
INSTALLATION—ENGINE DISTURBED
(ALL MODELS)
1. Locate No. 1 piston in firing position by either of
two methods described below.
CHEVROLET TRUCK SERVICE M ANUAL