1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16

Drive Belt Tension
Adjustment
Troubleshooting Tests
(Alternator on Engine)
Use the following tests in conjunction with the “Trou-
bleshooting” in Section 1. Before proceeding with the
tests, however, perform the following checks to elimi-
nate possible problem areas. Also observe “Precau-
tions,” preceding,  to prevent  damage to  alternator
system.
Alternator
1.
Install drive belt on pulleys and adjust tension as
follows:
a.   Pivot  alternator  away from  engine,  as  re-
quired,  until correct  tension is  obtained  as
shown. Belt should depress 1/4 in. (6 mm).
1.
If problem is an  undercharged battery, check to
ensurethatunderchargedconditionhasnotbeen
caused by excessive accessory current draw or
by accessories which have accidentally been left
on. Also, check that undercharged condition has
not been caused by running engine at too low a
speed for extended periods of time.
a
2.
Check physical condition and state of charge  of
battery, as outlined in “Battery - Storage” in Sec-
tion 4A. Battery  MUST BE at  least 75% (1.230
specific gravity) of fully charged to obtain valid re-
sults in the following tests. If not, charge battery
before testing system.
3.
4.
Inspect  entire alternator  system  wiring for  de-
fects.  Check all  connections for  tightness  and
cleanliness,  particularly  battery   cable  clamps
and battery terminals.
Check alternator  drive belt  for excessive wear,
cracks, fraying and glazed surfaces and replace
if necessary. Also,  check drive belt tension and
adjust if necessary, as outlined under “Drive Belt
Tension Adjustment.”
72669
a -  Check Point
b.   After obtaining correct  tension, securely re-
tighten alternator  brace attaching bolts  and
alternator mounting bolts.
Circuitry Test
Perform the following tests, using a 0-20 volt DC volt-
meter, to check that all of the circuits between the al-
ternator and the other components within the alterna-
tor system are in good condition.
2.
If a new drive belt has been installed, recheck belt
tension after running for five minutes.
OUTPUT CIRCUIT
1.
Connect positive (+) voltmeter lead to alternator
output terminal and negative (–) lead to a ground
terminal on alternator.
Index
4C-4 - CHARGING SYSTEM
90-823224--2  796
Product Specification
CategoriesMercury MerCruiser Manuals
Tags,
Model Year1993, 1994, 1995, 1996, 1997
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- 930 pages
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(4 votes, average: 4.5 out of 5)
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1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 SKU UPC Model
Nick on Aug 13, 2018. Exactly what I was looking for!

Hugely helpful service manual! Perfect. Thank you!


Sonthaya Traipug on May 04, 2018. Freelance Yachts Service

Manuals are all Important for Technician


Glenn on Dec 02, 2015. Nice

This book is invaluable if you do your own repairs. Great book.


Joseph on Oct 04, 2015. 1997 7.4l Bravo

Could not find a copy until a search brought me here.
Excellent print.
Thank you


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