APPLICATION

The HUNGER VD4HD is a versatile
machine featuring modular components for

• machining valve seats,
• facing sealing surfaces on cylinder heads, cylinder liners, and engine blocks, and
• boring out valve seat ring bores on large diesel and gas engines.

Features:

Two electric motors ensure a uniform drive of the boring head.

The boring head is interchangeable, allowing the specified seat angle to be maintained with precision through proper selection of the boring head.
Roundness, concentricity, seat angle, and surface finish of the machined valve seat meet the specifications of engine manufacturers.
With a facing head available as an accessory, the machine can be operated as the VD4HD-RC facing lathe.
With a taper turning head available as an accessory, the machine can be used as the VD4HD/-30° taper lathe for reconditioning the tapered surface on the valve cage.
With a boring gear head available as an accessory, the machine can be utilized as the VD4HD-ADM boring machine for boring out valve seat pockets to install oversize seat rings.

Operation:

First, clamp the pilot with the mounted cross-arm support into the valve guide.
Mount the machine onto the pilot and position the cutting tool in front of the inner edge of the valve seat.
Set the cutting depth using the finely graduated infeed scale.
Boring proceeds automatically.
At the push of a button, the valve seat is turned from the inside out at the specified seat angle.

If a predecessor model VD4E is already on hand, feed gearboxes, boring heads, pilots, and cross-arm supports can also be used in conjunction with the more powerful VD4HD drive unit.