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MerCruiser 3.0 MPI User Manual

MerCruiser 3.0 MPI
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Section 5 - Maintenance
Page 74 90-899883272 MARCH 2008
Replacing Belts on Front Mount Models
32557
a
b
c
d
e
a - Power steering belt
b - Alternator belt
c - Alternator
d - Spacer block
e - Crank position sensor
POWER STEERING PUMP DRIVE BELT
1. Loosen power steering pump attaching bolts and mounting bolts.
2. Pivot power steering pump toward engine, as required, until belt can be removed.
3. Install new drive belt on pulleys. Adjust tension.
ALTERNATOR BELT
1. Remove the power steering belt, if equipped.
2. Remove the two screws and washers from the front engine mount bracket assembly
on the port side.
3. Remove the spacer block between the bracket assembly and the engine block. You
may need to tap gently on the spacer.
4. Loosen the alternator. Remove and replace the alternator belt.
5. Replace the spacer block between the bracket assembly and the engine block. Install
the two screws using the washers removed previously.
6. Adjust the crank position sensor so the gap between the sensor and the flywheel meets
the following specification.
Description Specification
Crankshaft position sensor air gap 0.040 in.
7. Tighten the two spacer block bolts. If necessary, you can loosen the crankshaft position
sensor bolts to move the sensor into position. Tighten all bolts to specification.
Description
Nm lb‑in. lb‑ft
Spacer block bolts 68 50
Crankshaft position sensor bolts 2 18
8. Install power steering belt, if equipped. Adjust the tension of both drive belts.
Description
Deflection 6 mm ( 1/4 in.)

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MerCruiser 3.0 MPI Specifications

General IconGeneral
Horsepower135 hp (101 kW)
IgnitionElectronic
Cylinders4
AspirationNaturally Aspirated
Compression Ratio9.3:1
Full Throttle RPM4400-4800 RPM
Displacement3.0L / 181 CID
Fuel SystemMulti-Port Injection (MPI)
Bore x Stroke4.00" x 3.60" (101.6mm x 91.4mm)
Fuel Requirement87 Octane Minimum
Engine TypeInline 4
Cooling SystemRaw water
Alternator Output65 amp

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