525 tds info

Hi, I am looking for anyone with tech info/pics of the 525 tds engine. Ive lost oil pressure, and think I have to replace the oil pump. Any info regarding this would be appreciated. It is the 2.5 M51 engine...Is it similar to the petrol M50?? I think it very well is, so again, any pics of this would help too. Thanks, Stevie

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