3.
Check drain plug and lens cover bolts. Tighten
securely. Do not over-tighten cover bolts or cover
may warp and leak water into boat.
•
Due to the manner in which this test is per-
formed, it may not be possible to detect a
marginal condition or a high-speed water
pump output problem.
1.
Remove water hose, which runs between pump
outlet and engine, and replace with another hose
of same diameter, but approximately 3 ft. (1 m)
longer. Hose should be wire reinforced or of ade-
quate wall thickness to prevent it from kinking
when performing test. Clamp hose at pump outlet
only. Do not clamp hose at engine end.
b
a
72644
a
a - Drain Plug
b - Lens Cover Bolts (2, One Hidden In This View)
4.
Open seacock, if equipped.
71170
b
Seawater Pickup Pump
Output Test
Engines With Combination Seawater / Mechani-
cal Fuel Pump
If an overheating problem exists, use this test to de-
termine if a sufficient amount of water is being
supplied to cool engine.
a - Seawater Inlet Hose
b - Hose To Cooler
IMPORTANT: The following information should
be observed before proceeding with test:
•
BOAT MUST BE IN THE WATER FOR THIS
TEST. This test CANNOT BE performed with a
flush-test device and water hose.
b
a
•
The ability of this test to detect a problem is
greatly dependent upon the accuracy in
which it is performed. An error in setting the
engine RPM, timing the test or measuring the
water output will affect the overall accuracy
of the test and may produce misleading re-
sults. To help ensure accurate results, a shop
tachometer with an error of less than 5%
should be used. The boat tachometer defi-
nitely should not be used as its accuracy is
questionable. A stop watch should be used to
time the duration of the test to help ensure
that the accuracy is maintained within one
second. An 8 qt. (7.6 L) or larger capacity con-
tainer should be used to measure water out-
put.
72352
Engines WIth Cool Fuel System
a - Seawater Inlet Hose
b - Hose To Cooler
2.
Place an 8 qt. (7.6 L) or larger container near un-
clamped end of hose.
Index
6A-6 - SEAWATER COOLED SYSTEMS
90-823224--2 796
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
Thank you