SERVICE MANUAL NUMBER 24
MAINTENANCE
Engine and Tune-Up Specifications
MCM (Sterndrive)
MCM 5.0L
ALPHA BRAVO
MCM 5.7L
ALPHA BRAVO
Model
Propshaft Horsepower
(SAV1 Rating)
220
1
2501
Propshaft Kilowatts (SAV1 Rating)
Number of Cylinders
Displacement
1641
1861
V-8
305 cid (5.0 l)
350 cid (5.7 l)
Bore / Stroke - in. (mm)
Compression Ratio
3.74 x 3.48 (95 x 88.4) 4.0 x 3.48 (101.6 x 88.4)
9.4:1
Compression Pressure
Idle rpm In Neutral3
Minimum 100 psi (690 kPa)7
650 rpm5
Maximum rpm (at WOT)3
4400-4800 rpm
Minimum 30 psi (207 kPa)
Minimum 4 psi (28 kPa)
3-7 psi (21-48 kPa)
Oil Pressure (at 2000 rpm)
Minimum Oil Pressure (at Idle)
Fuel Pressure (1800 rpm)
Electrical System
12 V Negative (–) Ground
55 or 65 amp 8
Alternator Rating
Minimum Battery Requirements
Firing Order
375 cca / 475 mca / 90 Ah
1-8-4-3-6-5-7-2
AC - MR43LTS
Champion - RS12YC
NGK - BPR6EFS
Spark Plug Type
Spark Plug Gap
.045 in. (1.1 mm)
10° BTDC
Timing (at idle rpm)4
Preliminary Idle Mixture
Thermostat
1 1/4 Turns
160° F (71° C)
1
2
Power Rated in Accordance with NMMA (National Marine Manufacturers’ 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” Bodensee and Swiss Regulations. Horsepower differences shown result from
differences 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.
A special procedure must be followed to adjust idle rpm. Consult your Authorized Mercury MerCruiser Dealer
before attempting this procedure.
5
6
Idle speed on EFI models is not adjustable.
7
Minimum recorded compression in any one cylinder should not be less than 70 percent of the highest recorded
cylinder.
8
Serial Number Break 65Amp starts at OL619000 and up.
Index
90-861327--1
OCTOBER 1999
Page 1B-7
| 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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Marine readers have rated Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID 4.0 out of 4.0 based on 1 product reviews. Great performance engine.
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