Mercury V8 250 User Manual

DMT 2004 Digital Multimeter 91‑892647A01
Oil Temperature Sensor Resistance Test
Temperature Reading (nominal)
0 °C (32 °F) 32.6 kΩ
20 °C (68 °F) 12.5 kΩ
40 °C (104 °F) 5.3 kΩ
65 °C (150 °F) 2.1 kΩ
95 °C (203 °F) 786 Ω
4. Perform a continuity check of the sensor wiring between the sensor connector and the PCM. Note that there are splices in
the ground circuit.
NOTE: The quickest way to check the wiring is to measure the resistance of the thermistor at room temperature, connect
the sensor to the engine harness, and measure the resistance across PCM connector sockets CE1 and CB1. If the two
resistance values match, then the wiring is good.
DMT 2004 Digital Multimeter
91‑892647A01
Terminal Test Probe Kit Bosch P/N MM‑ 46523
a - Oil temperature sensor connector
b - PCM connector C
Connector Pin Wire Color Function PCM
53172
B
A
A Black/orange Sensor ground A (–) CE1
B Tan/light blue Oil temperature signal CB1
Oil Temperature Sensor Removal
1. Cut the cable tie that secures the sensor harness to the engine harness.
2. Disconnect the sensor harness from the engine harness.
3. Remove the sensor from the engine.
a - Oil temperature sensor connection to engine
harness
b - Cable tie
c - Oil temperature sensor
d - Oil filter
Oil Temperature Sensor Installation
1. Ensure that the O‑ring is in good condition and is installed on the sensor.
2. Install the oil temperature sensor into the engine.
3. Tighten the sensor to the specified torque.
100C
100A
BLK/ORN
BLK/ORN
TAN/LT BLU
TAN/LT BLU
H4
B1
E1
A1
A
B
C
D
E
F
G
H
1
2
3
4
A
B
C
D
E
F
G
H
A
H
1
4
67387
b
a
A
B
67420
d
a
c
b
Sensors
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 5A-33

Mercury V8 250 Specifications

General

Engine Type	V8
Horsepower	250 HP
Displacement	4.6L
Fuel Induction System	Electronic Fuel Injection (EFI)
Steering	Hydraulic Steering
Gear Ratio	1.75:1
Cylinders	8
Starting	Electric Start
Full Throttle RPM Range	5200-6000 RPM
Alternator Amp	85 amp
Shaft Length	25 in
Weight	527 lbs
Fuel Type	Unleaded 87 octane minimum