Service manual

MAINTENANCE SERVICE MANUAL NUMBER 26
Page 1B-4 90-861329--1 MARCH 1999
Engine and Tune-Up Specifications
MODEL MCM 3.0L
Propshaft Horsepower
(SAV1 Rating)
135
1
(114
2
)
Propshaft Kilowatts
(SAV1 Rating)
101
1
(85
2
)
Number of Cylinders 4
Displacement 181 cid (3.0L)
Bore/Stroke In. (mm) 4.00 X 3.60 (101.6 X 91.4)
Compression Ratio 9.25:1
Compression Pressure Minimum 100 psi (690 kPa)
7
Idle rpm (In Neutral)
3
700 rpm
5
Max rpm (At W.O.T.)
3
4400-4800 rpm
Oil Pressure (at 2000 rpm) Minimum 30 psi (207 kPa)
Fuel Pump psi (At 1000 rpm) 6-8 psi (41-55 kPa)
Minimum Oil Pressure At Idle 4 psi (28 kPa)
Electrical System 12 Volt Negative (-) Ground
Minimum Battery Requirements 375 cca / 475 mca / 90 Ah
Firing Order 1-3-4-2
Spark Plug Type
AC - MR43LTS
Champion - RS12YC
NGK - BPR6EFS
Spark Plug Gap .035 in. (0.9 mm)
Timing (At Idle)
4
1° BTDC
8
/ 1° ATDC
9
/ 2° ATDC
10
Preliminary Idle Mixture 1 1/4 Turns
Thermostat 143° F (62° C)
8
/ 160° F(71° C)
10
1
Power Rated in Accordance with NMMA (National Marine Manufacturers’ Association) rating procedures.
2
Power Rated in Accordance with SAV1 rating procedures. This rating procedure is used to certify that the en-
gine complies with “Stage 1” Bodensee and Swiss Regulations. Horsepower differences shown result from dif-
ferences in test rpm, allowable test tolerances, and/or installation of special kit components.
3
Measured using an accurate service tachometer with engine at normal operating temperature.
4
Timing must be set using a special procedure as outlined in the appropriate section of this manual. Timing can-
not be properly set using the conventional method.
5
A special procedure must be followed to adjust idle rpm. Consult your Authorized MerCruiser Dealer before
attempting this procedure.
7
Minimum recorded compression in any one cylinder should not be less than 70 percent of the highest recorded
cylinder.
8
Serial number break: 0L096999 and below
9
Serial number break: 0L097000 - 0L0340999
10
Serial number break: 0L341000 and above.
Index