181
CID (3.0L) 4 CYLINDER GM ENGINE
SERVICE MANUAL NUMBER 26
Cleaning and Inspection
CONNECTING RODS
1.
2.
Wash connecting rods in cleaning solvent and dry with compressed air.
Check for twisted and bent rods and inspect for nicks and cracks. Replace damaged
connecting rods.
PISTONS
NOTE: Cylinder bore and taper must be within specifications before pistons can be consid-
ered for reuse.
1.
Clean varnish from piston skirts with a cleaning solvent. DO NOT WIRE BRUSH ANY
PART OF PISTON. Clean ring grooves with a groove cleaner and make sure oil ring
holes are clean.
2.
Inspect piston for cracked ring lands, skirts and pin bosses, wavy worn ring lands,
scuffed or damaged skirts and eroded areas at top of piston. Replace pistons that are
damaged or show signs of excessive wear.
3.
4.
Inspect grooves for nicks and burrs that might cause rings to hang up.
Measure piston skirt (across centerline of piston pin) and check clearance as outlined
under “Cylinder Block.”
5.
Slip outer surface of a new top and second compression ring into respective piston ring
groove and roll ring entirely around the groove to ensure that ring is free as shown. If
binding occurs at any point, determine cause. If caused by ring groove, remove by dres-
sing with a fine cut file. If binding is caused by a distorted ring, recheck with another ring.
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6.
Proper clearance of piston ring in its piston ring groove is very important to provide
proper ring action and reduce wear. When fitting new rings, clearances between ring
and groove surfaces should be measured. See “Specifications.”
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Index
Page 3A-50
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