MEASURE BORE AT 2 POINTS,
90’ APART
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CROSS HATCH
PATTERN
FIGURE 9-9 -- MEASURING CYLINDER BORE FIGURE 9-10 --
HONING CYLINDER WALLS
D. CgE$er iore - If badly scored, excessively worn or tapered or out of round more than
, re orlng is necessary. Use an inside micrometer to determine amount of wtar
(See Fits and Clearance Set tion). If cylinder bore is not damaged and is within tolerances,
only light deglazing may be* necessary.
2. REBORING PROCEDURE - See Clearance Section for original cylinder bore size. Use an inside
micrometer to measure wear then select nearest suitable oversize of either .OlO, .020 or .030ff.
Reboring to one of these oversizes will allow usage of the
z;ailable oversize piston and ring
‘assemblies. While most commercially available cylinder hones can be used with either portable
drills or drill presses, the use of a low speed drill press is preferred as thi’s facilitates more
accurate alignment of the bore in relation to the craG&aft crossbore.
Reboring is best accom-
plished at drill speed of about 600 RPM.
After installing coarse stones in hone, proceed as
follows :
A* Lower hone into bore and after centering, adjust so that stones are in firm contact with
walls. Diesel fuel oil or kerosene can be applied to the stones as a cutting-cooling agent.
B. With the lower edge of each stone positioned even with the lowest edge of the bore, start
drill and begin honing process.
Move hone up and down while reboring to prevent formation
of cutting ridges.
Check size frequently.
c.
When bore is within . OOtS*’ of desired size, remove coarse stones and replace with burnish-
ing stones.
Continue with burnishing stones until within .OOOS” of desired size then use
finish stones and polish to final size.
D.
After reboring, carefully clean cylinder wall with soap and water, then after drying
thoroughly, apply light coat of SAE LO oil to prevent formation of rust.
CRANKSHAFT
Carefully inspect crankshaft for signs of excessive wear or damage.
Look for metallic pickup or
score marks on crankpin and main bearing journals.
If keyways ark badly worn or chipped, the crank-
shaft may have to be replaced.
If journals and/or crankpins are worn beyond .002”, regrind to the
nearest undersize of ,010, .O2O or .030’*.
Regrind .OIOr’ under on L654 and use .OlOl’ undersize rod.
. Use corresponding Service type main and connecting rod bushings on L6OO or rod on L654 to attain
correct running clearance.
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