Pete Lewis Posted May 31, 2023 Report Share Posted May 31, 2023 in general the small hole is to allow atmospheric pressure/temperature changes to bleed air when while static even oil expands when hot and shrinks when cooled so changes in the crankcase need a small open vent or you can make leaks etc. Pete Link to comment Share on other sites More sharing options...
Iain T Posted May 31, 2023 Report Share Posted May 31, 2023 Are vented oil caps available (the top hat type are unobtainable) or can I drill a hole in the centre of my cap? Iain Link to comment Share on other sites More sharing options...
Dan lewis Posted June 6, 2023 Author Report Share Posted June 6, 2023 Hi everyone thanks alot for all your help but im pretty sure i have found my problem the piston connected to the diaphram isnt pushing onto the little plate releasing the pressure so im am going to buy and new smiths valve thanks again 👍 Link to comment Share on other sites More sharing options...
Ian Foster Posted June 12, 2023 Report Share Posted June 12, 2023 On 06/06/2023 at 18:40, Dan lewis said: the piston connected to the diaphram isnt pushing onto the little plate releasing the pressure Dan Do you have the spring under the little plate? Ian Link to comment Share on other sites More sharing options...
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