VACUTEST 116 - An instrument for testing sealing conditions between valves and valva seats in cylinder heads of combustion engines

VACUTEST 116 makes it possible to carry out reliable, exact, time-saving sealing tests :

  • On complete disassembled cylinder heads
  • After re-conditioning valve seats, before re-assembling the cylinder head
  • For testing sealing in combustion chambers


Intake volume11.6 l/min
Maximum vacuum-800 mbar
Elettric power220 V - 50 Hz
Dimensions330x160x200 mm
Weight10 Kg


  • Diaphragm vacuum pump with overload protection
  • Manometer
  • Filter
  • Suction hose with rapid coupling
  • Suction adapters 50x80 mm and Ø 45 mm


  • Suction adapters of different dimensions (on request)
  • A specially designed VACUTEST instrument is available for heavy engine cylinder heads (specify on ordering).

Instructions for use

Proceed as follows for a correct and complete vacuum test :

  • Vacuum test on combustion chambers
    Select the most suitable suction adapter for the combustion chamber under testing and connect it to the rapid coupling of the suction hose. Switch on the testing device and cover the spark chamber with the adapter. The vacuum gauge should register between -700 and -800 mbar. If it registers less than 700, the valve seats are not tight and must be seen to. If it registers a vacuum of more than 700, the valve seat is properly sealed, but the valve guide seal must stili be tested.

  • Vacuum test on valve guides
    Fit the appropriate adapter to the suction hose for the input and exhaust ports of the cylinder head. Proceed as descnbed above on each of the two ducts. If the vacuum gauge registers less than 700, the valve guide is loose and should be rectified. (To obtain a precise reading we recommend oiling the valve stem with lubricant. This reduces to a minimum the normal passage of air caused by the interference with the stem and tbc valve guide).


VACUTEST 116 does not require special maintenance.However, after a long period of use, the suction filter should be examined and cleaned (A dirty filter will cause the gauge to register a vacuum even when it is on but not m operation).

Remove the back cover of the housing and the filter glass, unscrew the filter and clean it.

When suction capacity diminishes, check the diaphragm pump by sealing it directly (vacuum -800 mbar).

Also inspect the suction hose and rapid coupling, as well as the packing motenal of the adapter.