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I am currently upgrading my oil pump in my RB25, just wanted to confirm that the 81mm RB26 reimax gears will fit my pump?

https://www.rhdjapan.com/reimax-oil-pump-rotor-gear-kit-81mm-bnr32-bcnr33-bnr34.html

Also the housing was quite scored internally, would this be anything to worry about? I also have to heli coil a thread for the back in plate of the pump as one of the screws had to be drilled out, is this okay or not recommended?

Thanks!

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https://www.sau.com.au/forums/topic/473704-rb25-oil-pump-upgrade/
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Scoring is definitely something to worry about. Pump gears are pump specific so 26 won't fit rb25 pump. From sound of it, suggest you get a new pump.

I use an rb26 N1 pump with Spool gears, was best price overall and have had no issues with it on rb25

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