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 TM 55-1905-223-24-3
(4) Adjust the position of the base and swivel so the driver will move freely on the arbor.
(a) Tighten the capscrew to hold the base to the cylinder head.
(b) Tighten the clamp screw for the swivel.
(5) Be sure that the alignment is correct, then remove the driver. Use the T-handle arbor puller and remove the
arbor.
(6) Apply lubricating oil to the arbor and the hold in the adapter sleeve.
(a) Put the cutter into position over the valve seat.
(b) Install the arbor into the valve guide.
(c) Install the adapter sleeve onto the arbor.
(7) Install the gear case into the swivel.
(a) Engage the bottom of the drive shaft with the top of the cutter. Ensure the drive shaft is against the cutter.
(b) Tighten the clamp screw to hold the gear case and drive shaft in the swivel.
(8) To set the depth of the cutter:
(a) Rotate the feed depth knob counterclockwise four or five complete turns.
(b) Put the new valve seat insert under the knob.
(c) Turn the feed depth knob clockwise until it is against the valve seat insert.
(d) Turn the knob counterclockwise until there is 0.006 to 0.010 in h (0.15 to 0.25 mm) clearance between the
c
knob and the insert.
(9) Turn the feed engaging knob clockwise to engage the feed mechanism. Attach the chuck of a 1/2 inch electric
drill to the drive shank.
(10) Start the drill and cut the counterbore until the feed depth knob is against the gear case.
(a) Let the cutter turn two or three more revolutions to ensure the counterbore surface is even.
(b) If the feed engagement knob disengages before the knob is against the gear case, turn the knob by hanto
d
complete the cut.
(11) Loosen the clamp screw for the gear case. Remove the gear case, arbor and cutter. Be careful not to move the
base or swivel.
(12) Remove all metal particles and dirt from the counterbore.
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