Thank you Dave,

Having read the technical reference page for oil pumps everything is clear (I must remeber to that first next time I have an issue)!
The last two bolts that hold the pump in position (in the engine) are clamping the gears ever so slightly, it turns but not freely. I will lap the gears this evening and test the pump clamped with some nuts and bolts to simulate this - as it says in the article.

In hindsight, the problem has been casued by the lapping of the pump endplates, they had swirl marks on them from the gears, effectively I've lapped out any clearance that naturally occured. They did need doing though, the end plates weren't very flat!



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Thanks again,
Gino

email (option): gino_kerekes@yahooooo.co.uk