Section 5 Operating Instructions HP7A Manual
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5-1
Operating Instructions
Block Loading
The block hold down xture can be used for inline, ‘V’, and ‘Y’ blocks.
Move the hone carriage to the far right of the main base.
Place block supports onto cradle with key engaged into slot. Place supports on edge for blocks with
exposed main bearing caps (V-block). Place supports at for blocks with main bearing caps recessed
above the pan rail (Y-block).
Main bearing caps must be installed.
Place clamp bar through main bearings of block.
Rotate clamp screws out of the way.
Lower the block into the xture. Align the clamp bar with the front clamp bar guides on the cradle
ends. Pull the block toward you after the bar engages the front guides. The clamp bar will rotate into its
clamping position. Allow the clamp bar to slide down these guides as the block is lowered.
Rotate clamp screws forward and clamp the bar evenly.
Squeeze the index handle on the right side of the xture to allow the xture to rotate. Release the handle
allowing the stop block to fall into the appropriate slot in the index plate. After honing the rst bank of a
V-block, simply squeeze the handle and rotate the xture so the other bank is in position for honing.
Setting the Bottom and Upper Travel Limit
Check for possible interference points in the lower part of all cylinders. Push the side of the hone carriage
and move the machine to the cylinder that has the highest interference point. The bottom stop should be
set in this cylinder.
Measure the distance from the top of the cylinder to the bottom of the cylinder to obtain the cylinder
length. The over stroke distance should be approximately 1/2”. Less if there is interference. Add the
cylinder length and over stroke length to obtain the bottom stop length.
Expand or contract the stone assembly to the approximate bore size. To expand: turn handwheel
counter clockwise (looking from the top). To contract: pull and turn ratchet feed release, turn handwheel
clockwise (looking from the top).
Push the upper lock button and use the handle to pull the stroking arm down and to touch the bottom
of the stone to the top of the engine block. Lock the stroking arm in this position using by releasing the
upper lock button.
Rotate the lower Adjustment Knob to the correct bottom stop length (cylinder length plus over stroke)
using the bottom stop scale and the bottom of the pivot block.
Note: The stroke length gauge is not to scale and should be used for reference only.
Unlock the stroking arm and pull the stroking arm down against the bottom stop. Make sure you pull
hard enough to collapse the lower stop bumper. At this position rotate the hone head one turn to
make sure there are no obstructions. Adjust the bottom stop and re-check for obstructions if required.
Bottom stop setting will not have to be changed in this block unless there is an obstruction in one of the
other cylinders. Be sure to tighten the thumbscrew on the Adjustment Knob.
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