Mercury-MerCruiser GM V6 262 CID 4.3L Marine Engines Service Manual Number 25 Sections 1-3

262
CID (4.3L) ENGINES
SERVICE MANUAL NUMBER 25
7.
Install piston rings as follows:
a.   Install oil ring spacer in groove and insert anti-rotation tang in oil hole.
b.   Hold spacer ends together and install lower steel oil  ring rail with gap properly lo-
cated.
c.   Install upper steel oil ring rail with gap properly located.
d.   Flex the oil ring assembly to make sure ring is not binding. If ring groove is causing
binding, remove with a fine cut file. If a distorted ring is causing binding, 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 con-
necting 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.  Install with
connecting  rod  bearing  tangs  toward  outside  of  cylinder   block.  Use  piston  ring
compressor to compress rings. Guide connecting rod into place on crankshaft journal
with connecting rod bolt guide. Use a hammer handle with light blows to install piston
into bore. Hold ring compressor firmly against cylinder block until all piston rings have
entered cylinder bore.
Index
Page 3A-82
90-861328--1 NOVEMBER 1999
Product Specification
CategoriesMercury MerCruiser Manuals
Tags,
Model Year1998, 1999, 2000, 2001
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Mercury-MerCruiser GM V6 262 CID 4.3L Marine Engines Service Manual Number 25 Sections 1-3 SKU UPC Model
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