AMMCO 3950 Cylinder Hone User Manual

Model 903950

Cylinder Hone

Operating & Service Instructions with Part Identiﬁcation

AMMCO Tools, Inc. • Hennessy Industries • 1601 J.P. Hennessy Drive, LaVergne, TN 37086-3565

(800) 688-6359 • (615) 641-7533 • (615) 641-5104 FAX • www.ammcoats.com

Range 1-7/8" to 2-3/4" (47.6 mm to 69.8 mm)

Oversize Stone Sets available to increase range to 3-5/8" (92 mm)

1. Place stones and bufﬁng guides in alternate slots in the hone body.

2. Place the No. 901880 Drive Shank in the chuck of a 1/2" electric drill. If a blind cylinder is to be honed or if there is any obstruction limiting the depth of the honing stroke, set the drive shank stop to the depth that will prevent the hone from striking that obstruction or the end of the cylinder, otherwise the stones will break. Rotate crankshaft before honing each cylinder to give the greatest amount of clearance.

3. Before honing, cover crankshaft bearings or other exposed machined surfaces with oily rags for protection.

4. Check the cylinders with a micrometer or gauge to determine which has worn to the largest diameter. The largest cylinder should be honed ﬁrst so that the others may later be honed to an equal diameter.

5. Place the hone in the cylinder and expand the stones with the knurled adjusting knob until the hone will support its own weight. About one extra turn of the adjusting knob will give the proper honing pressure.

6. Place the drive shank collar on the hone and begin honing. Always start to hone at the end of the cylinder nearest the crankshaft as this portion has less wear and will provide an accurate guide. Hone with even strokes (approximately 40 strokes per minute).

7. Check the cylinder frequently with a gauge. Hone until the bore is round and straight. As stock is removed, it may be necessary to increase honing pressure by turning the adjusting knob.

8. IF THE BUFFING GUIDES DO NOT WEAR AS FAST AS THE STONES, DRESS THEM DOWN SLIGHTLY WITH A COARSE FILE. THE DISTANCE ACROSS THE BUFFING GUIDES SHOULD BE ABOUT 1/32" LESS THAN THE DISTANCE ACROSS THE STONES.

9. Clean the stones and buffing guides often with a wire brush to ensure maximum cutting efficiency. Apply AMMCO No. 903880 Honing Oil liberally at the ﬁrst sign of stone loading.

10. Use finishing stones to remove the last .002" to .003" (.050 mm to .076 mm) of stock. Keep the ﬁnishing stones clean and free of loading dirt, otherwise they might scratch the cylinder wall.

11. Hone the other cylinders to the same diameter as the ﬁrst one honed.

12. Use Nos. 903955 or 903956 Stone Sets for aluminum. Use No. 903880 Honing Oil liberally to prevent loading. Hone with moderate to light honing pressure and fast up-anddown strokes.

13. Clean the cylinder thoroughly using warm water and soap. If not available, use clean rags soaked in No. 10 oil. Do not use kerosene or gasoline as solvents of this type will not remove all the honing waste.

Replacement Parts and Accessories

No. 903951 Roughing Stone Set for Cast Iron

Range 1-7/8" - 2-3/4" (47.6 mm - 69.8 mm)

No. 903952 Finishing Stone Set for Cast Iron

Range 1-7/8" - 2-3/4" (47.6 mm - 69.8 mm)

*No. 903953 Roughing Stone Set for Cast Iron

Range 2-3/4" - 3-5/8" (69.8 mm - 92 mm)

*No. 903954 Finishing Stone Set for Cast Iron

Range 2-3/4" - 3-5/8" (69.8 mm - 92 mm)

*No. 903955 Stone Set for Aluminum

Range 1-7/8" - 2-3/4" (47.6 mm - 69.8 mm)

*No. 903956 Stone Set for Aluminum

Range 2-3/4" - 3-5/8" (69.8 mm - 92 mm)

*No. 903880 Honing Oil, 12 oz. (.035 L) can

No. 901880 Drive Shank No. 908554 Stop Assembly No. 903957 Stone Carrier Retainer Springs

* Not Standard Equipment. Order as Required.

903990 00 02/99