SERVICE MANUAL NUMBER 26
181 CID (3.0L) 4 CYLINDER GM ENGINE
Cylinder Head
.003-.008
(0.15)
in any 6 in. (152) or .007
Overall Max
Gasket Surface Flatness
Valve System
Lifter
Rocker Arm Ratio
Collapsed Tappet Gap
Intake
Hydraulic
1.75 to 1
3/4 Turn Down from Zero Lash
45°
Face Angle
Exhaust
45°
Seat Angle (Intake & Exhaust)
Seat Runout (Intake & Exhaust)
Intake
46°
.002 (0.05) Max
1/16 (.0625 in.) (1.16 mm)
1/16-5/64 [.0625-.07812 in.] (1.6-2.0 mm)
.0010-.0027 (0.025-0.069)
.0007-.0027 (0.018-0.069)
.003 (0.09) Max
Seat Width
Exhaust
Intake
Production
Exhaust
Stem
Clearance
Intake
Service
Exhaust
.004 (0.11) Max
Free Length
2-1/16 in. (52 mm)
Valve
Closed
100-110
lb. (136-149 N) at 1-19/32 in. (41 mm)
Pressure
Valve
Open
Spring
208-220
lb. (282-300 N) at 1-7/32 in. (31 mm)
Installed
Height ±
.031(8)
Intake
(1/32) 1.6562 (42)
None
Exhaust
Internal Damper
General
Some of the repairs in this section must be completed with engine removed from boat.
Engine removal depends upon type of repair and boat design. Place engine on repair stand
for major repairs.
When engine removal is not required, make certain that battery cables are disconnected
at the battery prior to performing any on-board engine repair procedure.
Lubricate all moving parts (during reassembly) with engine oil. Apply Quicksilver Perfect
Seal on threads of and under heads of cylinder head bolts, and on threads of all cylinder
block external bolts, screws and studs.
Model
No. of Cylinders
cu-in./liters Displacement
MCM 3.0L
4
181 (3L)
Index
90-861329--1
MARCH 1999
Page 3A-7
| 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.
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