Do Not Use Belt Dressing; Belt Cleaning Instructions; "Hot Start" Problem Conditions - Fleetwood Bounder 1986 Owner's Manual

NOTE: When installing or adjusting accessory
drive belts, be sure the bolts in the accessory ad-
justing pivot point and in the adjusting slot are
tightened properly.
Do Not Use Belt Dressing
Belt dressing is not recommended for belts at any
time. Most dressings contain chemicals which tend
to soften belts. While this softening process does in-
crease the friction between the belt and pulley
grooves, the result is only temporary.
Belt Cleaning Instructions
Remove all grease and oil as quickly as possible
before they can penetrate the belt and cause
deterioration.
Clean the belts by wiping them with a clean cloth.
Use a non-flammable cleaner or solvent to remove ex-
cess grease and oil. Water and a detergent soap can
also be used, but they are not as satisfactory as a non-
flammable cleaner.
WARNING: TO REDUCE THE RISK OF PERSONAL
INJURY, DO NOT ATTEMPT TO CLEAN THE
BELTS WHILE THE ENGINE IS RUNNING AND
NEVER USE FLAMMABLE CLEANINGSOLVENTSI
"HOT START" PROBLEM CONDITIONS
The following information has been extracted from
three GM Service Bulletins relating to "hot start" prob-
lems. Problem conditions and corrective procedures
are described.
Reference: GMC Dealer Service Technical Bulletin No.
78-T-1 (October, 1977)
(All Gasoline Engine Models)
A hard "hot start" condition can be caused by heat
expansion of the starter solenoid "S" terminal,
resulting in an internal open circuit.
To overcome the excessive "S" terminal expansion:
1. Remove ground cable from battery negative (-
) post.
2. Remove heat shield from starter motor (where
applicable).
3. Disconnect wire from "S" terminal, remove and
discard existing nut which retains the stud to
soleniod case and replace with flat washer, GM
Part No. 131015 or equivalent, nut, GM Part
No. 2030900 or equivalent, and torque nut to
12 to 17. lb.
4. Re-connect wire to "S" terminal with existing
nut. Torque nut 12 to 17 in. lb.
5. Reinstall heat shield (where applicable).
6. Reconnect ground cabel to battery negative (-)
post.
66
Reference: Chevrolet Dealer Service Technical Bulletin
No. 78-T-28 (April, 1978)
(P-Series Motorhomes with Mark IV Engines)
High ambient and/or underhood temperatures can
lead to component overheating. The two starting
system components, most vulnerable to adverse ther-
mal effects, are the battery and the starter motor
solenoid as follows:
1. Batteries subjected to long term storage or
'operating conditions which do not keep the bat-
tery adequately charged may be marginal
because of sulfation. When operated in high am-
bient temperatures, electrolyte temperatures
may be excessive. During engine off hot soak
periods, marginal batteries adjacent to radiators
may approach the boiling point of the electrolyte
(about 230°F) depending on state of discharge.
NOTE: some motor home body builders install
batteries in a tray near the radiator, while others
use a sliding shelf away from engine tempera-
tures. The trade-off, however, is longer battery
cables and a higher voltage drop. Battery ther-
mal guards or heat shields, reflective paints,
and/or battery relocation are appropriate where
evidence indicates battery thermal problems.
2. The starter motor solenoid, in close proximity
to the exhaust pipe, is subject to radiant heating
which ultimately increases coil resistance. The
resistance increase, decreases current flow to
the point where the coil cannot be energized
with the available applied voltage.
In some cases, the battery voltage available for
solenoid operation is adequate when the coil is
relatively cool, but insufficient when the coil is
hot. Typically the voltage drop across the igni-
tion switch, neutral start switch circuit, to the
solenoid, should not exceed 2 volts. This, nor-
mally, would allow approximately 8 volts for
solenoid operation. Unfortunately, the igni-
tion/start circuit voltage drop can exceed 4 volts,
due to switch contact resistance, wire lengths,
etc. Since the soleniod requires a minimum of
7 volts for positive operation, a marginal or "no
start" situation can occur ..
On "hot start" complaint vehicles that exhibit
symptoms related to inoperative solenoids, the
use of magnetic switch, GM Part No. 001486
or equivalent, is recommended. It is, in effect,
a high current relay whose contacts are con-
nected across the solenoid "S" and B"
terminals. The coil of the magnetic switch is
connected in series with the ignition/neutral start
switch circuit. Maximum available voltage is,
therefore, applied to the soleniod, since the
voltage drop in the magnetic switch contact cir-
cuit is virtually zero. Service Bulletin No. 78-T-28
distributed to GM Dealers describes in detail, the
procedure for installing the magnetic switch.