RS 993 - System for inserting and grinding valve seats and guides

System for inserting and grinding valve seats and guides

Thirty years' experience in the world of engines plus a production of over 40.000 portable grinders are behind our new model RS 993: a stationary system for inserting and grinding valve seats and guides which combines the consolidated experience of PEG with the latest technological innovation.

The result is an extremely reliable machine whose design has benefitted from ideas developed to salve the problems met by mechanics in keeping abreast with the dynamics of new types of engines. The electronic reduced to the minimum, without superfluous sophistications and the simplicity of the operative systems conceptions, make the RS 993 particularly reliable and movable in any workshop. The machine is a modern instrument capable of handling present and future needs in restoring with maximum precision the original efficiency of cylinder heads for any type of engine - turbo, induction, petrol or diesel.


The system's intelligence is contained in the working head, which moves on an air cushion in four directions (forward, backward, right, left). The high precision spindle is attached to a ball joint which enables in to be used with inclinations in any directions of up to ±7º. Movement is transmitted by a d.c. motor, keyed in axis, which makes it possible to operate with constant torque; rev. regulation from 50-800 rpm is by means of a cyclo-converter. These combined movements of the working head and sleeve enable the operative head to be positioned on the real axis of the valve guide, so that the milling operation is carried out with absolute precision.

The tool works on valve seats in any type of material: it roughs out or finishes the three angles of the seat. This saves a great deal of time because the operation is finished immediately and there is no need for final grinding to smooth off the seat. In fact this tool produces a finish far superior to that obtained by final grinding, which becomes superfluous and would even spoil the perfect finish. The tool can be changed and fitted to different motors with simple rapid operations wich do not require any particular skills.


Spindle head

Spindle head

1) movement of the working head
2) handwheel for guiding the sleeve in circular movements and for up-down movements of the tool

Cylinder head stands

Cylinder head stands

Tilting magnetic stands (±45º) with air cushion movement in all directions. Electro-magnetical locking.


  • Machine complete with working head and cylinder head stand
  • n°2 stands for cylinder head
  • n°1 tool holder head
  • n°3 tools bit head, adjustabel for Ø18-35/30-42/42-60 mm
  • n°1 flat tool bit
  • n°2 shaped tool bit 30º and 45º
  • n°6 hardened steel fixed pilots
  • n°7 hardened steel self-centering pilots complete with expander cone
  • n°1 tool setting device
  • n°1 service handtools



  • Pilots in all sizes and diameters, in both millimeters and inches
  • Fixed pilots in tungsten cardibe
  • Hard metal tool bits
  • Tool-holders for Ø>60mm
  • Tip holder for Ø>60mm
  • Toolssharpener with diamond tapping wheel
  • Micrometer
  • Precision chuck with adjustable cone
  • Vacuum tester
  • Reamers (ant Ø on request)
  • Pilot rack



Complete range of tool bits for all engines. For special orders, state the hardness and dimensions of the valve seat, as per drawing.

PEG RS 993PEG RS 993


working field1100 x 100 mm
Quill stroke200 mm
Min.fresabile diameter for valve seat18 mm
Max.fresabile diameter for valve seat90 mm
Min.per incameratura diameter valve seat rings24 mm
Max.per incameratura diameter valve seat rings60 mm
Chuck rotation speed (RPM)0-1000
Voltage220 V
Power380 W
Air pressure116 psi
Peso Approssimativo1500 Kg
Dimensions WxDxH1500 x 1200 x 2200 mm