SERVICE MANUAL NUMBER 26
181 CID (3.0L) 4 CYLINDER GM ENGINE
6.
7.
Clean and inspect pistons, if not previously done.
Install piston rings as follows:
a. Install oil ring spacer in groove and insert anti- rotation tang in oil hole.
b. Hold spacer ends butted and install lower steel oil ring rail with gap properly located.
c. Install upper steel oil ring rail with gap properly located.
d. Flex the oil ring assembly to make sure ring is free. If binding occurs at any point,
the cause should be determined and, if caused by ring groove, removed by dressing
groove with a fine cut file. If binding is caused by a distorted ring, use a new ring.
IMPORTANT: Use piston ring expander (91-24697) for compression ring installation.
e. Install lower compression ring with marked side up, using ring expander.
f.
Install top compression ring with marked side up, using ring expander.
Installation
IMPORTANT: Cylinder bores must be clean before piston installation. Clean with a
light honing, as necessary. Then clean with hot water and detergent wash. After
cleaning, swab bores several times with light engine oil and clean cloth, then wipe
with a clean dry cloth.
1.
2.
3.
Lubricate connecting rod bearings and install in rods and rod caps.
Lightly coat pistons, rings and cylinder walls with light engine oil.
With bearing caps removed, install connecting rod bolt guide (3/8-24) (J-5239) on
connecting rod bolts.
IMPORTANT: Be sure ring gaps are properly positioned as shown.
g
e
f
b
b
c
a
d
72373
Ring Gap Location
a - Oil Ring Spacer Gap (Tang In Hole Or Slot Within Arc)
b - Oil Ring Gaps
c - 2nd Compression Ring Gap
d - Top Compression Ring Gap
e - Port Side
f - Engine Front
g - Starboard Side
4.
Install each connecting rod and piston assembly in its respective bore.
a. Install with connecting rod bearing tangs toward outside of cylinder block.
b. Use piston ring compressor to compress rings.
c. Guide connecting rod into place on crankshaft journal with connecting rod bolt guide.
Index
90-861329--1
MARCH 1999
Page 3A-53
| 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