are used.
Recommendations given are specifically
designed to put proper finish and geometric design in
cylinder liner with a minimum of stock removal. For this
reason, only one grit size is used and stones are used wet.
(b) Cylinder walls.
Walls can be
straightened with 4 or 5 final passes through bore. Proper
finish will be on walls due to fine grading of stone
recommended. Visual inspection of liner honed, according
to recommendations, will indicate importance of using
equipment and procedures which give the operator
maximum control of operation.
1. Place cylinder liner in cylinder
bore of a scrap block without packing rings or crevice seal.
Upper liner bore in block should be relieved so liner will drop
into place very easily.
2.
Tap two water holes and
assemble capscrews and soft washers to holes making sure
soft washers are over liner flange, but do not extend into
bore of liner. Tighten finger tight.
Figure 3-266. Cylinder liner bore inspection.
3. Place dial gage in cylinder liner
about 1 l/ inches from top.
4. Watch gage for movement while
capscrews are tightened to secure liner.
5. Loosen capscrews and move dial
bore gage to another position in liner bore and repeat check
while tightening capscrews.
6. If distortion is noted, remove liner
and check for dirt between flange and counterbore ledge.
Also, check flatness of counterbore ledge. If liner is seating
evenly on ledge, distortion will be less than 0.0003 in. and
barely noticeable.
7.
Assemble a honing stand to
cylinder block. Use wooden blocks to adapt base to bore
Figure 3-267. Cylinder liner cross section.
size; then use expanding foot to tighten base to stand in
(5) Inspect worn liners with dial bore gage
bore.
8. Assemble upper support arm to
of new liner maximum diameter, replace or hone to next
stand and attach drill handle to canvas loop.
oversize. See table 2-2 for new liner dimensions. Pistons
9. Place a quick coupler securely in
for oversize liners are available in 0.020, 0.030 and 0.040 in.
drill chuck (fig. 3-268).
oversizes.
10. Insert hone assembly into top of
(6) Mark liners to be reused for ridge cutting,
cylinder liner. Raise center pinion assembly /4 in. and turn
boring or grinding and honing if worn less than above limits
counterclockwise (left) to expand stones to approximate
and otherwise undamaged in areas 1 and 2 (fig. 3-267).
bore size, figure 3-269. Push center pinion down until its
c. Repair. Cylinder liners should not be reused
inside gear engages outside gear on hone body. Attach
without reboring or regrinding if they exceed worn limits.
hone to quick coupler.
Pistons and rings are available in 0.020, 0.030, 0.040 in.
11. Swing upper support arm so drill
oversizes. Add oversize increments to standard dimensions
and hone are approximately over center of liner bore.
to determine final oversize dimension desired.
Adjust length of canvas strap attached to drill so hone hangs
(1) Remove ridge at top of worn liners with a
with ends of stones extending out of liner bore
ridge cutter, or other means, to prevent damage to new
approximately 1 inch.
rings.
12. Adjust stroking stop (collar and
(2) Grind or bore liners to next standard
wing screw) so stones will not extend more than 1 inch from
oversize.
bottom of cylinder liner at end of down stroke. Put enough
(3) Finish hone liners to proper finish.
down pressure on hone to make sure they will not hit
(a) Liner honing.
Honing operation
obstructions beneath liner during honing.
described below is not designed to enlarge cylinder bore
several thousandths for oversize pistons and rings. When
3-94 honing oversize, both roughing and finishing stones
3-94
