R M Seabrook

9 January 2025 at 18:07 #72656

I fitted one of these to my 2 litre some years ago.  The result was that oil pressure went through the roof and caused no end of leaks, so I removed it.  The relief valve recirculates the oil, it doesn’t return it direct to the sump.  Without the non-return valve I think there is sufficient capacity in the pipe direct from the sump to allow the pressure to drop.  Close the pipe off and there is nowhere for the pressure to go except up!. I think Laurence is right, and the non return valve compensates for a pump that is worn or porous. I only have to prime the system after an oil change, on both my 2 litres.  Having said that, I do have a pump that works very well on the bench (great flow of oil) but will not work on the car even after priming.  It looks to be in good condition, but there is obviously something amiss.

Roger

 

 

R M Seabrook

4 July 2022 at 17:33 #57085

Dear Hans,

There is an oil slinger behind the nut that holds the shaft in place (see attached). If the nut is loose this may be stopping the slinger from working. However, the best solution is to introduce a lip seal into the carrier that holds the water pump in place. The slinger can then be ground to provide a suitable surface for the lip seal to work on. I had this done on my saloon as the whole assembly needed overhauling and this seemd a worthwhile modification. It also has the added bonus of stopping any water being sucked into the timing case, should the drain hole get blocked.

Best wishes,

Roger

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