03-Q0-18
Engine-Service
03-oo-1 8
SERVICE PROCEDURES (Continued)
Cylinder Out-of-Round
Measure the cylinder bores in the directions as shown:
CYLINDER
BORE
A23317-A
If the difference between measurements exceeds the
maximum out-of-round value as specified in Section
03-01A (3.8L) or Section 03-018 (4.6L) under
Specifications, rebore the cylinder to oversize.
Cylinder Bore Diameter
Measure the diameter of each cylinder bore at 32 mm
( 1.25 inch) down from head deck at
90
degrees to the
piston pin centerline.
Cylinder Wall Honing
SP ECIAL SERVICE TOOL(S) REQUIRED
Description
Tool Number
Engine Cylinder Hone Set
T73L·60 1 1-A
Honing is recommended for refinishing cylinder walls
only when no cross-hatch pattern is visible on cylinder
walls or for fitting pistons (61 08) to the specified
clearance. The grade of hone is determined by the
amount of metal to be removed. Follow the instructions
of the hone manufacturer.
H
coarse stones are used to
start the honing operation, leave enough material so
that all hone marks can be removed with the finishing
hone which is used to obtain the proper piston
clearance. After honing, thoroughly clean cylinder
bores with a detergent and water solution.
NOTE: Only experienced technicians should perform
this work.
NOTE: Before any cylinder is refinished, all main
bearing caps must be in place and tightened to the
proper torque
so
that the crankshaft bearing bores will
not become distorted from the refinishing operation.
Cylinder walls that are severely marred and
I
or worn
beyond the specified limits should be refinished. Hone
only the cylinder or cylinders that require refinishing.
All pistons are the same weight, both standard and
oversize; therefore, various sizes of pistons can be
used without upsetting engine balance. Refinish the
cylinder with the most wear first to determine the
maximum oversize. If the cylinder will not clean up
when refinished for the maximum oversize piston
recommended, replace the cylinder blocks.
Refinish the cylinder to within approximately 0.038
mm (0.0015 inch) of
the
required oversize diameter.
This will allow enough stock for the final step of honing
to obtain the correct surface finish and pattern. For the
proper use of the refinishing equipment, follow the
manufacturer's instructions.
Use a motor-driven, spring pressure-type Engine
Cylinder Hone Set T73L-6011-A and hone at a speed
of 300-500 rpm. Hones of grit sizes 18Q-220 will
normally provide the desired bore surface finish of
18-38 AA.
CAUTION: After the final operation In either of the
two refinishing methods described and prior to
checking the piston fit, thoroughly clean with a
detergent and water solution and then oil the
cylinder walls or rusting of cylinder bores may
occur.
When honing the cylinder bores, use a lubricant
mixture of equal parts of kerosene and clean engine oil
meeting specification WSS-M2C 153-F. Operate the
hone to produce a cross-hatch finish on the cylinder
bore. The cross-hatch pattern should be at an angle of
approximately
30
degrees to the cylinder bore. Mark
the pistons to correspond to the appropriate cylinders.
When the refinishing of all affected cylinders has been
completed and all pistons are fitted, thoroughly clean
the entire cylinder blocks and oil the cylinder walls.
1997 Thunderbird. Cougar July 1 996
Содержание Thunderbird
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