b31 newby question

[EDDIE SIMPSON]

thanks for recomendations adrian. i am going to buy the service sheets as i have a online parts manual. i think the oil pump overhaul was time well spent as bits of piston ring and bore looked to be wedged in the gears. i will start a full strip later  in the week.

[GLENN]

Did you resurface the side plates on the oil pump? Pretty pointless rebuilding it if you haven't.

Just asking what are the side plates on the oil pump?  Cheers, Glenn

[chaz]

https://www.draganfly.co.uk/index.php/bsa/bsa/a710--b3133--c101112--m202133/category/893-oil-pump
the plates are not available from Draganfly but normally steel and when the gears rotate they can wear circles in the plates. a sheet of flat glass  and fine emery cloth worked on the face can flatten them if surface grinders not available.
applies to other oil pumps as well as the flange face that mounts with a gasket to the case..

[GLENN]

I see - the oil pump top and bottom plates. Also, in my experience when rebuilding the oil pump the gears will need lapped into the Mazak housing as you will probably see 'swelling' below the gear that will force the gears into the top and bottom plates whe the oil pump bolts are tightened.  Cheers, Glenn