Author Topic: oil pump - help!  (Read 5987 times)

0 Members and 1 Guest are viewing this topic.

Offline Kook652

  • Full Member
  • *
  • Posts: 17
Re: oil pump - help!
« Reply #25 on: November 08, 2025, 07:19:06 PM »
I have replaced hundreds of these seals over the years and you will find that one will just pop out and, the next will be a stubborn #$%*. Some that we have tried to remove has ended in damaging the pump body ( pic)  where the common sense says, "walk away, walk away and come back to it" but, the little devil inside is determined not to be beat.

After a lot of thinking we came up with the ideal tool, a simple tap. Remove all the rubber from the seal with a scapel leaving just the metal case of the seal. Knock the tap in so it grips, turn and it is out with no damage whatsoever  ;)

This is brilliant and works as described. Thank you.I tried drilling, prying, heat.............the.... My seal popped right with an M17x2.0 tap.

did you use m17x2 tap as they come or did you have to do any grinding to it? tapered or bottom tap?

thank you.

This has worked best - after rebuilding a few pumps.

m16 x 2 HSS 4 Flute Bottoming Tap      #DWTB16X2

https://www.homedepot.com/p/Drill-America-M16-x-2-High-Speed-Steel-4-Flute-Bottoming-Hand-Tap-1-Piece-DWTB16X2/305700499?

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 15,450
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: oil pump - help!
« Reply #26 on: November 09, 2025, 07:54:40 PM »
Thanks for the part number!
I have 11 oil pumps to rebuild this winter...
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).