SERVICE MANUAL NUMBER 30
496 CID (8.1L)
Reassembly
IMPORTANT: Reassembly of pistons and connecting rods require adherence to the
following steps.
•
•
Piston and pins are not removable.
If original piston assemblies are being used, reinstall in same cylinder from which
they were removed.
•
•
Connecting rod bearing tangs are always toward outside of cylinder block.
Notch or relief valve in piston must be positioned correctly for the engine being re-
paired.
PISTON RINGS
All compression rings are marked on upper side of ring. When installing compression rings,
ensure that marked side is toward top of piston.
Oil rings consist of two rings and a spacer.
1.
2.
Select rings comparable in size to cylinder bore and piston size.
Slip compression ring in cylinder bore, then press ring down into cylinder bore about 1/4
in. (6 mm) below ring travel. Be sure that ring is square with cylinder wall.
3.
Measure gap between ends of ring with a feeler gauge as shown.
a
b
c
72372
a - Gap
b - Feeler Gauges
c - Compression Ring
4.
5.
6.
7.
If gap between ends of ring is below specifications, remove ring and try another for fit.
Fit each compression ring to cylinder in which it is going to be used.
Clean and inspect pistons.
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 verify 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 anew ring.
90-863161 SEPTEMBER 2000
INDEX
Page 3A-71
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 496 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 |
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