TM 9-4910-638-14&P
INSTALLATION OF ANCHORING DEVICE
The anchoring device is to be fastened into the cylinder next to the one to be bored. In the case of a four
cylinder block, only two settings of the anchoring device are required, as number 1 and number 3 cylinders
can be bored with anchoring device in number 2 cylinder, and number 2 and number 4 can be bored with
the anchoring device in number 3 cylinder. A six or eight cylinder block required four settings of the
anchoring device.
To install the anchoring device, proceed as follows:
Select the longest length of clamp which will freely enter the bore when in the position shown in figure 3.
Then, if the shoulders A-A allow more than 1/16" endwise movement of the clamp, loosen the two adjusting
screws (each one the same amount as nearly as possible by eye) until the endwise movement is between
1/32" and 1/16". Then fasten this clamp to the anchor body by means of the clamp pivot pin, in the position
indicated in figure 2.
Turn the centering screws in if necessary (keeping each one as nearly central with the centering spider as
possible by eye) until it will freely enter the cylinder and yet have but little side play in any direction. Select
the proper combination of extension rods and coupling with the anchor clamp and body. Screw the
assembly in or out until the approximate length is obtained.
The device is now ready to be put in place, but before inserting it, first examine the bottom of the cylinder
bore to determine the best position on which to clamp. Whenever possible, we advise setting the clamp
crosswise of the cylinder block, but if ribs or sloping walls interfere, use the nearest to a crosswise location
which provides sufficient flat surface on which to hook the clamp.
CAUTION
THE CLAMP MUST NEVER BE HOOKED LENGTHWISE OF THE BLOCK IF THE CYLINDERS ARE SO
CLOSE TOGETHER THAT ONE END OF THE CLAMP WOULD PROJECT BEYOND THE WALL OF
THE CYLINDER TO BE BORED. In other words, the MOST IMPORTANT CAUTION to be observed in
positioning the clamp is NEVER ALLOW THE CLAMP TO PROJECT TO A POSITION WHERE THE
BORING TOOL COULD STRIKE IT. Second in importance is selecting as flat a place as possible at
the bottom of the cylinder on which to hook the clamp.
Now, tilt the clamp on its pivot pin until the anchor will enter the cylinder and rotate to such a position as
determined by examination described in the above two paragraphs. Then lower until the upper tilted end
can be hooked against one side wall and pull up until the clamp engages both sides, as shown in figure 4.
Pull up on the clamp nut and shake the clamp back and forth to make sure both shoulders (or adjusting
screws) of the clamp are inside the cylinder. Continue to pull up on the clamp nut and at the same time,
adjust length until the U-shaped anchor gage figure 1 can be slipped into place. Then, turn the clamp nut
down almost tight against the gage. See figure 4. The device will now be in position, as shown by figure 2
or figure 4, and is ready for the machine to be slid over it. Turning one of the centering screws slightly will
lock the assembly in the cylinder.
Push the machine over the open end of the anchor gage first, as this allows removal of the gage after the
clamp nut engages the T-slot in the machine.
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