181
CID (3.0L) 4 CYLINDER GM ENGINE
SERVICE MANUAL NUMBER 26
3.
4.
5.
6.
7.
Coat seal lips with clean motor oil.
Install gasket and oil seal retainer with rear main seal.
Coat threads of oil seal retainer fasteners with Loctite Pipe Sealant with Teflon.
Install oil seal retainer fasteners and torque to 133 lb-in. (15 Nm).
Install oil pan fasteners. Torque 1/4-20 threaded fasteners to 80 lb-in. (9 Nm) and
5/16-18
threaded fasteners to 165 lb-in. (19 Nm).
NOTE: The oil pan gasket may be re-used if it is still pliable and is not cracked, torn or other-
wise damaged.
Main Bearings
IMPORTANT: Before removing main bearing caps or connecting rod caps, mark them
for reassembly in their original locations.
Main bearings are the precision insert type and do not use shims for adjustment. If
clearances are found to be excessive, a new bearing, both upper and lower halves, will be
required. Service bearings are available in standard size and .001 in., .010 in. and .020 in.
undersize.
Selective fitting of both rod and main bearing inserts is necessary in production in order to
obtain close tolerances. For this reason you may find one-half of a standard insert with one-
half of a .001 in. undersize insert which will decrease the clearance .0005 in. from using a
full standard bearing.
When a production crankshaft cannot be precision fitted by this method, it then is ground
.009
in. undersize on main journals only. A .009 in undersize bearing and .010 in. undersize
bearing may be used for precision fitting in same manner as previously described. Any
engine fitted with a .009 in. undersize crankshaft will be identified by the following markings:
•
•
“.009” will be stamped on crankshaft counterweight forward of center main journal.
No. “9” will be stamped on block at left front oil pan rail.
IMPORTANT: If crankshaft has an undersize journal and a new bearing is required,
journal must be reconditioned to accept a .010 or .020 in. undersize bearing as .009
in. undersize bearings are not available for service.
Inspection
In general, the lower half of the bearing (except No. 1 bearing) shows greater wear and more
distress from fatigue. If, upon inspection, the lower half is suitable for use, it can be assumed
that the upper half is also satisfactory. If the lower half shows evidence of wear or damage,
both upper and lower halves should be replaced. Never replace one half without replacing
the other half.
Index
Page 3A-44
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.
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Need help to instal automate choke