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Mercury MerCruiser MIE 7.4L MPI

Mercury MerCruiser MIE 7.4L MPI
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INSTRUMENTATION
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 4D-9
Senders
Oil Pressure
DUAL STATION SENDER IDENTIFICATION
Sender will have 353-AM stamped on hex of sender.
TESTING
IMPORTANT: Use following test procedure for checking accuracy of oil pressure
sender only. If oil pressure gauge indicates zero oil pressure, refer to SECTION 1C
“Troubleshooting.”
1. Remove wire from sender terminal.
2. Connect ohmmeter between sender terminal and sender case. Check ohms reading
without engine running (zero pressure), then check reading with engine running.
Compare oil pressure and ohms readings as shown in following chart:
72754
b
a
c
d
a-Positive Lead
b-Negative Lead
c-Wire Removed
d-Oil Pressure Sender
Oil
Press re
Ohms Reading
Press
u
re
(psi)
Single Dual
0 227-257 113.5-128.5
20 142-162.5 71-81.25
40 91.7-113.6 45.8-56.8
80 9-49 4.5-24.5
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