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PRD 4 bolt upgraded oil pump -S50/M50/M52

PRD 4 bolt upgraded oil pump -S50/M50/M52

The PRD oil pump & tensioner kit is the only true solution on the market for the the S52, M50 and M52 oil pump failure epidemic.

Contrary to popular belief, the true reason it is so common for these engines to end up either spinning the oil pump nut off the pump shaft or breaking the shaft is not engine harmonics. It is chain slack whipping back and forth at high rpm's, abusing the oil pump, sprockets and shaft. BMW did not use a tensioner, as they did in their race kit, to save costs over the course of millions of production engine builds.


The common solution is a oil pump shaft upgrade, which we offer, however, to fully bulletproof your engine and fight against oil pump failure, chipped sprockets and chain wear, add the chain tensioner.

On top of all this special ridged washers are used to stop the bolts from ever backing out.The PRD chain tensionser is the only product of it's kind, and uses a polymer tensioner against the chain, stopping the chain slack from damaging the oiling system during high rpm's.

The tensioner is a tested a piece which is produced and used on other OEM vehicles, and repurposed to be used in this application.


The reconditioned oil pump comes with an upgraded pump shaft, similar to the M54 GSR upgraded pump, that uses 4 bolts to attach to a custom drilled sprocket. It also features a beefed up shaft design, along with using a stronger material to take all the abuse you can dish out.Every base is covered in this kit, so your investment is finally safe! No core needed, so no core charges either!


When both items are selected, the complete kit includes:Reconditioned oil pump with upgraded shaft (4-bolt design)

Drilled oil pump sprocket

Oil pump chain tensionerTemplate to drill and tap tensioner mounting hole.




    PLEASE NOTE: And additional charge of £50 is now added which be refunded upo the return of your old pump

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