Author Topic: changing bearings in aluminium housings  (Read 287 times)

Offline MrBoo

  • Newbie
  • Posts: 1
    • View Profile
changing bearings in aluminium housings
« on: February 08, 2021, 10:17:32 AM »
I own a 1964 CB72.  The Honda workshop manual shows a method for removing the camshaft from the cylinder head: take a plastic hammer and a drift and hit the outer race of the camshaft bearings.  I did this as a teenager and the method is likely to damage the bearings.  Much better to warm the cylinder head with a hair dryer for 10 to 15 minutes.  Differential thermal expansion allows the steel bearing races to slide easily in the aluminium housings.  That is, the aluminium housing expands more than the steel bearing when heated.  50 to 60 degrees centigrade is usually enough to allow the bearings to slide while not being too hot to hold.

Offline AshimotoK0

  • Grogu
  • *
  • Posts: 6062
  • Mad Scientist.... more power Igor ! ٩(̾๏̮̮̃̾๏̃̾)۶
    • View Profile
Re: changing bearings in aluminium housings
« Reply #1 on: February 08, 2021, 10:33:47 AM »
Please introduce yourself Mr. Boo .. as I have a UK '64 CB72 I am restoring and always good to compare notes.

Some literature here which I scanned and are also in  my Dropbox links on here (along with other bike literature)

CB77 Service Manual:
https://www.dropbox.com/s/vs8c1fke3tcohpv/honda-shop-manual-CB77-superhawk.pdf?dl=0

1962 CB72 MCM review
https://www.dropbox.com/sh/1ly92qmzivx1ina/AAD4TwKvGkiEs14baZ_2krIGa?dl=0

CB72/77 Green v 2 Parts Book
https://www.dropbox.com/s/92db91hr189sazi/CB72_77%20Parts%20Book_2.pdf?dl=0

CB77 Parts Manual

https://www.dropbox.com/s/bwa12mrrriberq6/partslist_cb77_170513_0708.pdf?dl=0
“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.

Offline Laverda Dave

  • SOHC Master
  • Posts: 1438
  • Health is wealth
    • View Profile
Re: changing bearings in aluminium housings
« Reply #2 on: February 08, 2021, 08:49:18 PM »
I agree Mr Boo. I've just had to remove the countershaft bearing from the Z400J engine. I wasn't going to chance tapping it out especially as I need to reuse it. I used the electric paint gun around the area and it just fell out!
1976 Honda 400/4
1981 Honda CB250RSA
1977 Rickman Honda CR750
1999 Honda VFR 800FX
1955 750 Dresda Triton
1978 Moto Morini 350 Sport
1982 Laverda 120 Jota
1924 Triumph 550SD
2012 Stanley Battery Drill

Online K2-K6

  • SOHC Jedi
  • Posts: 3276
    • View Profile
Re: changing bearings in aluminium housings
« Reply #3 on: February 09, 2021, 12:28:56 AM »
For bearing removal

[ Guests cannot view attachments ]

Quite a neat concept and not too hard to make, possibly.


Offline Oddjob

  • SOHC Jedi
  • Posts: 3830
    • View Profile
Re: changing bearings in aluminium housings
« Reply #4 on: February 09, 2021, 07:42:58 AM »
Good idea that. Would be even better with a screw one slide hammer for blind bearings.

EBay? K2
Don't play stupid with me, I'm better at it

Online K2-K6

  • SOHC Jedi
  • Posts: 3276
    • View Profile
Re: changing bearings in aluminium housings
« Reply #5 on: February 09, 2021, 07:57:24 AM »
Good idea that. Would be even better with a screw one slide hammer for blind bearings.

EBay? K2

Yes, they use a small slide hammer on them. This source is specifically from Commencal MTB company for pulling bearings on rear suspension links etc like this picture of a rising rate shock linkage.  Similar in restrictions to some of the SOHC situations, these are paired and so difficult to get to the back of them.

  [ Guests cannot view attachments ]

Neat bit of thinking though.


Online K2-K6

  • SOHC Jedi
  • Posts: 3276
    • View Profile
Re: changing bearings in aluminium housings
« Reply #6 on: February 09, 2021, 08:25:09 AM »
I hadn't thought about it before,  but these are like a collet chuck in a lathe or mill tool chuck, but in reverse.

https://www.endurobearings.com/products/tools/bbt-200/ some bicycle tools are hellish expensive though  :o

[ Guests cannot view attachments ]

From above link, nicely made kit.



Offline AshimotoK0

  • Grogu
  • *
  • Posts: 6062
  • Mad Scientist.... more power Igor ! ٩(̾๏̮̮̃̾๏̃̾)۶
    • View Profile
Re: changing bearings in aluminium housings
« Reply #7 on: February 09, 2021, 10:06:23 AM »
If you watch Allen Millyards's videos on You-Tube  he uses a lovely old Sykes-Pickavant bearing puller which grips the outer race. Also videos on Youtube using mashed up white bread stuffed in the bearing to extract bearings that are in blind holes (hydraulic action)
“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.

Offline Trigger

  • Grogu
  • *
  • Posts: 7362
  • Engines built on reputation, not advertising.
    • View Profile
Re: changing bearings in aluminium housings
« Reply #8 on: February 09, 2021, 12:12:30 PM »
Never used one in all my time. Easy to put the part in the oven and once hot, tap the case down on a oak block  ;)

Offline paul G

  • SOHC Master
  • Posts: 1463
  • No room left in the garage
    • View Profile
Re: changing bearings in aluminium housings
« Reply #9 on: February 09, 2021, 12:20:08 PM »
Never used one in all my time. Easy to put the part in the oven and once hot, tap the case down on a oak block  ;)
Would Pine do  ;D ;)
Honda CB400 4
Honda CB550 K3
Honda CB750 UK K1
Kawasaki Z650 C2
Kawasaki Z650 cafe racer

Offline MrDavo

  • SOHC Master
  • Posts: 1193
  • He who dies with the most toys wins
    • View Profile
Re: changing bearings in aluminium housings
« Reply #10 on: February 09, 2021, 12:29:02 PM »
Quote
mashed up white bread stuffed in the bearing to extract bearings that are in blind holes (hydraulic action)

I wonder who first thought of stuffing his sandwich into a blind bearing?
1969 Honda CL450 'Scrambler'
1974 Kawasaki Z1A (Project)
2005 Harley XL1200R Sportster
1985 Porsche 911 3.2 Carrera Sport

 

SimplePortal 2.3.5 © 2008-2012, SimplePortal