01-16
Engine Service
01-16
SERVICE PROCEDURES (Continued)
Cylinder Walls, Refinishing
Cleaning
If the entire engine has NOT been disassembled,
clean the individual cylinder bore(s) with a cloth
soaked in solvent. Dry with a clean, lint-free cloth.
If the entire engine HAS been disassembled, refer to
Cylinder Block Cleaning in this section.
After any cylinder bore service operation, such as
honing or deglazing, clean the bore(s) with soap or
detergent and water. Then thoroughly rinse the bore(s)
with clean water to remove the soap or detergent, and
wipe the bore(s) dry with a clean lint-free cloth. Finally,
wipe the bore(s) with a clean cloth dipped in
X0-1 OW30-QSP or -DSP, or equivalent, motor oil
meeting Ford specification ESE-M2C153-E.
Inspection
Before removing the piston (6108):
1. Check the amount of ridge at the top of the bore.
A thick ridge is a sign of considerable wear.
2. Look for signs of coolant in the bore, especially
rust on the bore surface indicating possible
leaking head gasket or a crack in the cylinder
bore.
3. Check the top of the piston for possible oversize.
If oversize pistons have been installed, the
oversize will be stamped in the top of the piston
(6110).
After the piston is removed and the bore cleaned:
4.
5.
6.
Look for scoring. These are parallel gouges
usually on the piston thrust side, that is, at right
angles to the piston pin. If scored, the cylinder will
have to be refinished.
Look for cracks. If unsure about a crack, tiny
cracks may be detected by coating the bore with
a mixture of 25 percent kerosene and 75 percent
light engine oil. Wipe the bore dry and
immediately apply a coating of zinc oxide
dissolved in wood alcohol. Do not use rubbing
alcohol as a substitute. If cracks are present, the
coating will become discolored at the damaged
area. Replace the cylinder block if it is cracked.
Magnafluxing may also be used.
Check for cylinder wall glazing. When refinished,
the cylinder bore is given a slightly rough finish
with a cylinder hone to help seat the new piston
rings. This finish is worn away as the rings and
cylinder bore “mate” and the bore becomes
glassy smooth. If the engine has been run
enough for this to have happened, the cylinder
will at least have to be honed to seat the new
rings on the piston. New rings should be installed
when the piston is removed and reinstalled
because piston rings are given a special finish by
the factory to help them wear-in and seat. In
seating, the special finish is worn off. Reusing
piston rings will result in high oil consumption.
Cylinder Bore
Make sure cylinder bore is clean and dry before
measuring.
Using a suitable cylinder bore micrometer or gauge,
measure the cylinder bore(s) in the X and Y directions
(90 degrees apart) at points A, B, and C. The X
direction is parallel to the piston pin. The Y direction is
perpendicular to the piston pin and is the direction of
piston thrust.
CYLINDER
1
.
.
A
t
B
CYLINDER
WALLS
Al 4470-B
Cylinder Bore Taper
Subtract the micrometer or gauge reading from point C
direction Y from point A direction Y. Also from point C
direction X from point A direction X. Each difference
should be less than 0.127mm (0.005 inch). If taper
exceeds this specification, cylinder will have to be
refinished.
CYLINDER
BORE TAPER
CYLINDER WALLS
Al 4471 -A
To Next Page
Loading...
Need help?
General
