MAINTENANCE
SERVICE MANUAL NUMBER 23
Tune-Up Specifications
MCM (Sterndrive) Models
MCM 454 Mag MCM 502 Mag
Model
MCM 7.4L MPI
MPI
MPI
Propshaft Horsepower
(SAV1 Rating)
3101
(2752)
385
1
4151
Propshaft Kilowatts
(SAV1 Rating)
2311
(2052)
287
8
1
3091
Number of Cylinders
502
(8.2L)
C.I.D.
Displacement
454 C.I.D (7.4L)
4.25 x 4.00 (108 x 101.6)
4.47
(113.5
x 4.00
x 101.6)
Bore/Stroke In. (mm)
Compression Ratio
9.3:1
8.6:1
8.75:1
Compression Pressure
Minimum 100 psi (690 kPa)6
6003
Idle rpm (in Forward Gear)5
Max. rpm (at W.O.T.)
Oil Pressure (at 2000 rpm)
Min. Oil Pressure (at Idle)
Electrical System
4200-46003
4600-50003
Minimum 30 psi (207 kPa)
Minimum 4 psi (28 kPa)
12 V Negative (–) Ground
43 psi (248 kPa)
Fuel Pressure (Running)
Min. Battery Requirements
Firing Order
650 cca / 825 mca / 150Ah
1-8-4-3-6-5-7-2
AC MR43LTS
Champion
RV12YC
AC MR43T
Champion RV15YC4
NGK BR6FS
Spark Plug Type
NGK BPR6EFS
.045
in.
Spark Plug Gap
.040 in. (1 mm)
(1.1
mm)
Timing (at Idle rpm)
Thermostat
8° BTDC4
160° F (71° C)
1
2
Power rated in accordance with NMMA (National Marine Manufacturer’s Association) rating procedures.
Power rated in accordance with SAV1 rating procedures. This rating procedure is used to certify that the engine
complies with “Stage 1” Swiss Regulations. Horsepower differences shown result from differences in test rpm,
allowable test tolerances, and/or installation of special kit components.
3
4
5
6
Measured using a accurate service tachometer with engine at normal operating temperature.
Timing must be set using a special procedure as outlined in the appropriate section of this manual.
Idle speed on EFI engines is not adjustable.
Minimum recorded compression in any one cylinder should not be less than 70 percent of the highest recorded
cylinder.
Index
Page 1B-8
90-861326--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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