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Hallite 88 anti-dieseling rings are fitted to pistons outboard of the main bearings to reduce the possibility of the heat of compression ignition (‘dieseling’) detonations damaging the main bearings or main piston seal. It is recommended that such rings be installed on the pistons in cylinders that are known to be subjected to shock loading and pressure spikes, for example cylinders on excavators.

Hallite 88 rings are made from a filled PTFE material which is designed to withstand the heat of the compression ignition combustion that can occur in a hydraulic oil/air bubble. They can be used in conjunction with main bearings such as Hallite 506 polyester fabric strip or Hallite 533 GFN bearings, and piston seals such as the Hallite 735.

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