MAINTENANCE
SERVICE MANUAL NUMBER 26
Engine and Tune-Up Specifications
MODEL
Propshaft Horsepower
(SAV1 Rating)
MCM 3.0L
1351
(1142)
1011
Propshaft Kilowatts
(SAV1 Rating)
(852)
Number of Cylinders
Displacement
4
181 cid (3.0L)
Bore/Stroke In. (mm)
Compression Ratio
4.00 X 3.60 (101.6 X 91.4)
9.25:1
Compression Pressure
Idle rpm (In Neutral)3
Minimum 100 psi (690 kPa)7
700 rpm5
Max rpm (At W.O.T.)3
4400-4800 rpm
Minimum 30 psi (207 kPa)
6-8 psi (41-55 kPa)
4 psi (28 kPa)
Oil Pressure (at 2000 rpm)
Fuel Pump psi (At 1000 rpm)
Minimum Oil Pressure At Idle
Electrical System
12 Volt Negative (-) Ground
375 cca / 475 mca / 90 Ah
1-3-4-2
Minimum Battery Requirements
Firing Order
AC - MR43LTS
Spark Plug Type
Champion - RS12YC
NGK - BPR6EFS
Spark Plug Gap
Timing (At Idle)4
.035 in. (0.9 mm)
1° BTDC8 / 1° ATDC9 / 2° ATDC10
Preliminary Idle Mixture
Thermostat
1 1/4 Turns
143° F (62° C)8 / 160° F(71° C)10
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 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.
A special procedure must be followed to adjust idle rpm. Consult your Authorized MerCruiser Dealer before
attempting this procedure.
Minimum recorded compression in any one cylinder should not be less than 70 percent of the highest recorded
5
7
cylinder.
8
Serial number break: 0L096999 and below
Serial number break: 0L097000 - 0L0340999
9
10
Serial number break: 0L341000 and above.
Index
Page 1B-4
90-861329--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 181 CID |
| Model Year | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(6 votes, average: 5 out of 5)
Marine readers have rated Mercury MerCruiser GM 4 Cylinder 181 cid 3.0L Marine Engines Service Manual Number 26 5.0 out of 5.0 based on 6 product reviews. Thanks for sharing this material. Helps a lot after suffering with bad mechanics. spend too much money and nothing very good
great manual, makes impossible jobs possible. without a manual you can not do the job, a must have.
Great resource. Excellent information provided.
Need help to install automate choke
Need help to instal automate choke