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MerCruiser MCM 3.0LX User Manual

MerCruiser MCM 3.0LX
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1B - 8 - MAINTENANCE 90-816462 2-695
Crankcase Oil
To help obtain optimum engine performance and to
provide maximum protection, we strongly recom-
mend the use of Quicksilver 4-Cycle Marine Engine
Oil. If not available, a good grade, straight weight, de-
tergent automotive oil of correct viscosity, with an API
classification of SF or SG, may be used.
The following chart is a guide to crankcase oil selec-
tion. Oil filter should always be changed with oil.
In those areas where recommended straight weight
oil is not available, a multi-viscosity 20W-40 (SF or
SG) or, as a second but less preferable choice,
20W-50 (SF or SG) may be used.
IMPORTANT: The use of non-detergent oils, mul-
ti-viscosity oils (other than 20W-40 or 20W-50),
low quality oils or oils which contain solid addi-
tives specifically are not recommended.
72010
Priming Engines with Oil
IMPORTANT: This applies to all power packages
that have not been run within 6 months, replace-
ment of partial engines or after rebuilding an en-
gine.
Tools Required
71089
91-52024A1 Remote Starter Switch
1. Fill crankcase to proper level with recommended
engine oil.
2. Remove spark plugs.
3. Leave ignition Key in “OFF” position.
4. Connect remote starter switch to large 12V termi-
nal (RED battery cable) and small terminal (YEL-
LOW-RED wire) on starter motor.
a. If Remote Starter Switch is not available, dis-
connect PURPLE wire from ignition coil be-
fore using key switch to crank the engine over.
Tape terminal on Purple wire to prevent it from
touching ground.
5. Crank engine over for 15 seconds, then allow
starter motor to cool for 1 minute. Watch that start-
er motor does not overheat.
6. Repeat until a total of 45 seconds of crank time is
achieved.
7. Remove Remote Starter Switch.
a. If key switch was used, reconnect Purple wire
to ignition coil.
8. Install spark plugs and wires.
9. With cooling water being supplied to seawater
pump, start engine.
Power Steering Fluid
Use Quicksilver Power Trim and Steering Fluid, or au-
tomatic transmission Fluid (ATF), Dexron III.
Index

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MerCruiser MCM 3.0LX Specifications

General IconGeneral
Displacement181 CID (3.0L)
Horsepower135 HP
Fuel SystemCarbureted
IgnitionElectronic
Alternator65 Amp
Cylinders4
AspirationNaturally Aspirated
Horsepower @ RPM135 HP @ 4800 RPM
Full Throttle RPM Range4400-4800 RPM
Fuel TypeGasoline
Cooling SystemRaw Water Cooled
Oil Capacity4.5 Quarts
Bore x Stroke4.00 x 3.60 in. (101.6 x 91.4 mm)
Dry Weight635 lbs

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