Cylinder Blocks

Call us for expert advice and a quotation for your engine machining requirements.

Pressure Testing

All pressure testing for cylinder blocks is carried out on our dedicated Delta pressure testing rig.


Pressure testing can be viewed as an insurance policy which, if faults are discovered, will prevent losing time and money working on a damaged block which might then be wasted if the block is found to be unserviceable at some later stage.


While it is good practice to pressure test any block before investing time and money carrying out more expensive machining work, any block showing symptoms related to water loss or oil/water cross contamination (especially when no obvious visible cause is evident) is a definite candidate for pressure testing.


Blocks to be tested are mounted on the rig where all water passages on the deck surface are covered using dedicated pads.  These pads are in turn covered with cross bars which spread the clamping forces evenly when the block is clamped down for testing.  The special air inlet pad is connected to the air feed at this stage.


Water outlets on the end or side faces of the block can be covered using similar pads and are secured in place with specially designed screw clamps which locate in the framework of the rig.


Apertures for sensor switches, drain taps etc can be blocked off using the original component or with screw in blanking plugs.


Once all water passages are blocked, an air inlet tap is turned on to fill the block with compressed air at pressures up to 60psi.  When full pressure is reached, the tap is then closed again and the pressure gauge monitored over a period of time for signs of pressure drop.  Falling pressures indicate a leak from within the casting which will then require further investigation.


Leaks can be detected using a bubble solution which, when applied, will foam around the area where any air is escaping from the casting indicating a leak at that point.


Pressure testing on cylinder blocks can show up faults such as cracks in outside walls, cracks and porosities in cylinder bores, internal leaks and leaks from core plugs which would not be evident from other means.

Call us for expert advice and a quotation for your engine machining requirements.