MerCruiser 305 CID (5.0L) Service Manual page 352

SERVICE MANUAL NUMBER 24
Cruiselog Meter
TESTING
1. Connect jumper wire from positive (+) battery terminal to positive (+) gauge terminal.
2. Connect jumper wire from negative (–) battery terminal to negative (–) gauge terminal.
3. Observe gauge run indicator. If indicator is not turning, replace gauge.
Vacuum Gauge
TESTING
1. Disconnect vacuum hose from engine.
2. Connect service vacuum gauge to engine and record engine vacuum readings at idle,
1000, 2000 and 3000 rpm.
3. Reconnect vacuum hose and compare vacuum gauge readings (at specified rpm) with
service gauge readings. Readings should be within 3 inches of vacuum of each other.
IMPORTANT: Make sure that vacuum hose between gauge and engine is not leaking
and that all connections are tight.
4. If gauge readings are not within specifications, replace gauge.
Index
90-861327--1 OCTOBER 1999
a - Indicator
INSTRUMENTATION
a
72752
72753
Page 4D-7