Operating Instructions
3-1
HP6A Manual
Chapter 3 Operating Instructions:
Block Loading:
The block hold down fixture 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 (see page 6.25). Place supports on edge for
blocks with exposed main bearing caps (V-block). Place supports flat for blocks with main bearing caps
recessed above the pan rail (Y-block).
Main bearing caps must be “ON”.
Place clamp bar through main bearings of block.
Rotate clamp screw out of the way.
Lower the block into the fixture. 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 fixture to allow the fixture to rotate. Release the handle
allowing the stop block to fall into the appropriate slot in the index plate. After honing the first bank of a V-
block, simply squeeze the handle and rotate the fixture so the other bank is in position for honing.
Setting the Bottom and Upper Stops:
Check for possible interference points in the lower part of all cylinders. Push the Clamp/Float button on
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).
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 the upper stop lever.
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.
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