Checking Belt Tension; Manifold Heat Control Valve (In Line) - Chevrolet 10 1971 Series Chassis Service Manual

Fig. 8 — Checking Belt Tension
3. Inspect for signs of corrosion on battery, cables
and surrounding area, loose or broken carriers,
cracked or bulged cases, dirt and acid, electrolyte
leakage and low electrolyte level.
proper level with distilled water or water passed
through a " demineralizer" .
The top of the battery should be clean and the
battery hold-down bolts properly tightened. Par­
ticular care should be taken to see that the top of
the battery is kept clean of acid film and dirt. When
cleaning batteries, wash first with a dilute ammonia
or soda solution to neutralize any acid present and
then flush off with clean water. Keep vent plugs tight
so that the neutralizing solution does not enter the
cell. The hold down bolts should be kept tight enough
to prevent the battery from shaking around in its
holder, but they should not be tightened to the point
where the battery case will be placed under a severe
strain.
To insure good contact, the battery cables should
be tight on the battery. If the battery cable terminals
are corroded, the cables should be cleaned separately
with a soda solution and wire brush.
If the battery has remained undercharged, check
for loose or defective fan belt, defective Delcotron,
high resistance in the charging circuit, oxidized
regulator contact points, or a low voltage setting.
If the battery has been using too much water, the
voltage output is too high.
Service Delcotron and Regulator
The Delcotron and regulator tests during tune up con­
sist of the above battery tests; the condition of the
battery indicating further tests and adjustments as out­
lined in Section 6Y.
Service Belts (Fig. 8)
Inspect belt condition.
Check and adjust if necessary for correct tension of
belt, as follows:
• Using a strand tension gauge, check the belt tension.
• If belt is below the minimum, adjust until the spec­
ified tension, is reached. (See Tune Up Chart in
Specification section.)
Service Manifold Heat Valve (Fig. 9 or 10)
Check manifold heat control valve for freedom of
Fill cells to
operation. If shaft is sticking, free it up with GM Mani­
fold Heat Control Solvent or its equivalent.
NOTE:
Tighten Manifold
Tighten intake manifold bolts to specificatiins in the
sequence outlined on Torque Sequence Chart located at
end of Engine Mechanical section. A slight leak at the
Fig. 10— M anifold Heat Control V a lv e (Typical V8)
Fig. 9— Manifold Heat Control Valve (In Line)
Tap shaft end to end to help free it up.
10-30 CHEVROLET TRUCK SERVICE MANUAL
ENGINE 6-5