INSTRUMENTATION
SERVICE MANUAL NUMBER 24
Speedometer
TESTING
IMPORTANT: When testing speedometer gauge for accuracy, the air supply used for
the test must be regulated to the specified air pressure. Do not apply excessive air
pressure to speedometer gauge.
1.
Apply air pressure directly to speedometer gauge (specified in chart) and note gauge
reading. Lightly tap pressure gauge during accuracy check.
2.
If gauge readings are not within specifications, replace gauge.
CALIBRATION CHART
Air Pressure Gauge psi
Speedometer Gauge MPH (km/Hr)
20±2 (32±1.6)
5.3
27.8
45±1 (72±1.6)
Tachometer
TESTING
1.
2.
Connect a service tachometer to engine and compare readings between the service
tachometer and the original tachometer.
Replace if not within specifications.
Tachometer
Allowance
6000
rpm
± 150 rpm
Gauge Replacement
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect battery cables from battery.
Remove wires from back of gauge.
Remove hoses if applicable (vacuum, speedometer gauge).
Disconnect light socket, if applicable.
Remove holding strap.
Remove gauge.
Position new gauge assembly in appropriate mounting hole.
Install holding strap and nuts. Tighten nuts evenly and securely.
IMPORTANT: Do not distort case or bracket by overtightening.
9.
Connect ground (BLK) wire to ground terminal, if gauge is not mounted in metal panel.
Connect other wires to gauge as specified.
10.
11.
12.
13.
14.
Connect hoses (vacuum, speedometer gauges).
Install gauge light socket.
Coat all terminals with Quicksilver Liquid Neoprene.
Reconnect battery cables to battery.
Index
Page 4D-8
90-861327--1 OCTOBER 1999
| 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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