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BASIC ENGINE
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CLEANING AND INSPECTION (Continued)
CYLINDER BLOCK
Cleaning
After any cylinder bore repair 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 engine oil. If these
procedures are not followed, rusting of the cylin-
der bore(s) may occur.
If the engine is disassembled, thoroughly
clean the block with solvent. Remove old gasket
material from all machined surfaces. Remove all
pipe plugs that seal oil passages; then clean out
all the passages. Blow out all passages, bolt
holes, etc., with compressed air. Make sure the
threads in the cylinder head bolt holes are clean.
Dirt in the threads may cause binding and result
in a false torque reading. Use a tap to true up
threads and to remove any deposits. Thoroughly
clean the grooves in the crankshaft bearings and
bearing retainers.
Inspect the cylinder wails for scoring, rough-
ness, or other signs of wear. Check the cylinder
bore for out-of-round and taper. Measure the
bore with an accurate bore gauge following the
instructions of the manufacturer. Measure the di-
ameter of each cylinder bore at the top, middle
and bottom with the gauge placed at right angles
and parallel to the centerline of the engine.
Use
only the measurements obtained at 90 de-
grees to the engine centerline when calculat-
ing the piston to cylinder bore clearance.
Refinish cylinders that are deeply scored and/
or when out-of-round and/or taper exceed the
wear limits. If the cylinder walls have minor sur-
face imperfections, but the out-of-round and
taper are within limits, it may be possible to re-
move the imperfections by honing the cylinder
walls and installing new service piston rings
providing the piston clearance is within specified
limits.
t
A
Inspection
check it for cracks. Minute cracks not visible to
After the block has been thoroughly cleaned,
the naked eye may be detected by coating the
suspected area with a mixture of 25% kerosene
and 75% light engine oil. Wipe the part dry and
immediately apply a coating of zinc oxide dis-
solved in wood alcohol. If cracks are present,
the coating will become discolored at the defec-
tive area. Replace the block if it is cracked.
Check all machined gasket surfaces for burrs,
nicks, scratches and scores. Remove minor im-
perfections with an oil stone.
Replace all expansion-type plugs that show
evidence of leakage.
-B
. fi
B CENTERLINE OF
CRANKSHAFT
l
A
A - At Right angle to center line of engine
B - Parallel to center line of engine
Top Measurement:
Make 12.70mm (l/2 inch) below top of block deck
Bottom Measurement:
Make within 12.70mm (l/2 inch) above top of
piston - when piston is at its lowest travel (B.D.C)
Bore Service Limit:
Equals the average of “A” and “B” when measured
at the center of the piston travel.
Taper:
Equals difference between “A” top and “A” bottom.
Out-of-Round:
Equals difference between “A” and “B” when measured
at the center of piston travel.
Refer to Specification tables at end of each engine section.
A41651G
OIL PAN
Cleaning
Scrape any dirt or metal particles from the in-
side of the pan. Scrape all old gasket material
from the gasket surface. Wash the pan in a sol-
vent and dry it thoroughly. Be sure all foreign
particles are removed from below the baffle
plate.
Inspection
Check the pan for cracks, holes, damaged
drain plug threads, and a loose baffle or a
damaged gasket surface.
Inspect for damage (uneven surface) at the
bolt holes caused by over-torquing the bolts.
Straighten surfaces as required. Repair any
damage, or replace the pan if repairs cannot be
made satisfactorily.
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