SERVICE MANUAL NUMBER 24
INSTRUMENTATION
4.
Heat sand and observe thermometer and ohmmeter.
e
b
a
d
c
72772
a - Suitable Container
b - Thermometer
c - Heat Source
d - Switch or sensor
e - Ohmmeter Leads
5.
As temperature rises, switch will close and ohmmeter will indicate continuity. Refer to
chart below for specifications.
Coolant Temperature Switch
Opens
Closes
48952
Switch
150-170°F (66-77°C)
175-195°F (79-91°C)
190-200°F (88-93°C)
215-225°F (102-107°C)
87-86080
Switch
Engine Coolant Temperature (ECT) Sensor
Temperature - to - Resistance Values
(Approximate)
°
F
°C
100
70
38
20
4
OHMS
185
210
160
100
70
450
1,800
3,400
7,500
13,500
25,000
100,700
40
20
-7
0
-18
-40
-40
87-88031
Switch
Opens
Closes
180-200°F (82-93°C)
220-240°F (104-116°C)
6.
7.
Turn heat source off. Allow sand to cool. Note readings again to ensure switch or sensor
operates at specified temperature.
Replace switch if switch fails within the specified temperature.
Index
90-861327--1
OCTOBER 1999
Page 4D-17
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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