262
CID (4.3L) ENGINES
SERVICE MANUAL NUMBER 25
CYLINDER CONDITIONING
1.
2.
Performance of the following operation depends upon engine condition at time of repair.
If cylinder block inspection indicates that block is suitable for continued use (except for
out-of-round or tapered cylinders), they can be conditioned by honing or boring.
3.
4.
If cylinders have less than .005 in. (0.127 mm) taper or wear, they can be conditioned
with a hone and fitted with high limit standard size piston. A cylinder bore of more than
.005
in. wear or taper may not clean up entirely when fitted to a high limit piston. To
entirely clean up the bore, it will be necessary to bore for an oversize piston. If more than
in. taper or wear, bore and hone to smallest oversize that will permit complete
.005
resurfacing of all cylinders.
When pistons are being fitted and honing is not necessary, cylinder bores may be
cleaned with a hot water and detergent wash. After cleaning, swab cylinder bores
several times with light engine oil and a clean cloth, then wipe with a clean dry cloth.
CYLINDER BORING
1.
Before using a boring bar, file off top of cylinder block to remove dirt or burrs. This is very
important to prevent boring bar tilt. Boring bar tilt causes the bored cylinder wall to not
be at right angles to crankshaft.
2.
Measure piston to be fitted with a micrometer, measuring at center of piston skirt and
at right angles to piston pin. Bore cylinder to same diameter as piston and hone to give
specified clearance.
NOTE: Hone cylinders as outlined under “Cylinder Honing” and “Piston Selection,”
following.
3.
Carefully observe instructions furnished by manufacturer of equipment being used.
CYLINDER HONING
1.
2.
3.
Follow hone manufacturer’s recommendations for use of hone and cleaning and
lubrication during honing.
Occasionally, during the honing operation, thoroughly clean cylinder bore and check
piston for correct fit in cylinder.
When finish-honing a cylinder bore to fit a piston, move hone up and down at a sufficient
speed to obtain very fine uniform surface finish marks in a crosshatch pattern of
approximately 30 degrees to cylinder bore. Finish marks should be clean but not sharp,
free from imbedded particles and torn or folded metal.
4.
Permanently mark piston (for cylinder to which it has been fitted) and proceed to hone
cylinders and fit remaining pistons.
IMPORTANT: Handle pistons with care and do not attempt to force them through
cylinder until cylinder is honed to correct size, as this type piston can be distorted
by careless handling.
5.
Thoroughly clean cylinder bores with hot water and detergent. Scrub well with a stiff
bristle brush and rinse thoroughly with hot water. It is extremely essential that a good
cleaning operation be performed. If any abrasive material remains in cylinder bores, it
will rapidly wear new rings and cylinder bores in addition to bearings lubricated by the
contaminated oil. Swab bores several times with light engine oil on a clean cloth, then
wipe with a clean dry cloth. Cylinder should not be cleaned with kerosene or gasoline.
Clean remainder of cylinder block to remove excess material spread during honing
operation.
Index
Page 3A-102
90-861328--1 NOVEMBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 1262 CID, Mercury MerCruiser 262 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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