BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
JWood Auction JRC Engineering dealers JWood Auction
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Photo posting tutorial

Member Spotlight
MikesClassics
MikesClassics
Queensland, Australia
Posts: 83
Joined: November 2016
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
209 registered members (68 royalstar tony), 1,772 guests, and 587 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Simon.Holyfield, Bushcreature, Doug Valley, tim_v7, BosBSA
10032 Registered Users
Top Posters(30 Days)
Lannis 144
kommando 102
Stuart 65
Popular Topics(Views)
476,308 mail-order LSR
Forum Statistics
Forums33
Topics65,711
Posts635,140
Members10,032
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate Thread
Opinions on a pair of butchered crank cases . . . #280962
10/26/09 6:36 pm
10/26/09 6:36 pm
Joined: Sep 2002
Posts: 139
Derbyshire
R
RossP Offline OP
BritBike Forum member
RossP  Offline OP
BritBike Forum member
R
Joined: Sep 2002
Posts: 139
Derbyshire
Hello folks,

I picked up a pair of perfect condition (eBay's words not mine!) late T100 unit cases a while ago only to find they had been drilled around the drive side bearing. Presumably by some previous 'craftsman' wanting to drift out the bearing race. . .

So what does everyone think?
Should I:

Build up the motor and not worry about it?

Weld up the holes and hope not to distort the machining for the bearing?

Fill the cases with soil, plant some tulips and look forward to Spring?

Cheers
Ross


Support Your #1 BritBike Forum!
Membership Type! Free
Member
Premium
Member
Premium Life
Member
Vendor
Member
Site
Sponsor
Recognition No Premium Member Premium Life member (5 years) Vendor Member Site Sponsor Membership
Post commercial threads No No No Yes Yes
Custom title No Yes Yes Yes Yes
Upload avatar & photos No Yes Yes Yes Yes
Link avatar & photos Yes Yes Yes Yes Yes
Private Message Storage: 10 100 100 100 100
Length of signatures 255 600 600 600 600
Removes this very advert island between post 1&2 No Yes Yes Yes Yes
Price Free $12.90/year $105.00 No End
$55.00/5 years
$210.00/year
($17.50/month)
Email
Click on button >>
  Premium Member Premium Life member Vendor Member Site Sponsor Membership
Re: Opinions on a pair of butchered crank cases . . . [Re: RossP] #280967
10/26/09 6:51 pm
10/26/09 6:51 pm
Joined: Aug 2007
Posts: 4,542
Kent UK
Blapper Offline
BritBike Forum member
Blapper  Offline
BritBike Forum member
Joined: Aug 2007
Posts: 4,542
Kent UK
Would you get unintentional sharing of fluids through them?

Blapper redwine

Re: Opinions on a pair of butchered crank cases . . . [Re: Blapper] #280971
10/26/09 7:00 pm
10/26/09 7:00 pm
Joined: Sep 2002
Posts: 139
Derbyshire
R
RossP Offline OP
BritBike Forum member
RossP  Offline OP
BritBike Forum member
R
Joined: Sep 2002
Posts: 139
Derbyshire
Well they're late cases so the primary and cranckcase oil are shared anyway. So I doubt the extra holes would be the end of the world in that respect.

And in any case, a bit of JB weld would soon make them oil tight.

Ross

Re: Opinions on a pair of butchered crank cases . . . [Re: RossP] #280974
10/26/09 7:07 pm
10/26/09 7:07 pm
Joined: Sep 2005
Posts: 5,963
NL
G
Ger B Offline
BritBike Forum member
Ger B  Offline
BritBike Forum member
G
Joined: Sep 2005
Posts: 5,963
NL
Quote:
sharing of fluids

blush
Blapper please explain... I get certain ideas reading this. crazy


Ger B

Re: Opinions on a pair of butchered crank cases . . . [Re: Ger B] #280976
10/26/09 7:30 pm
10/26/09 7:30 pm
Joined: Aug 2007
Posts: 4,542
Kent UK
Blapper Offline
BritBike Forum member
Blapper  Offline
BritBike Forum member
Joined: Aug 2007
Posts: 4,542
Kent UK
laughing laughing laughing

Steady on old chap!

Re: Opinions on a pair of butchered crank cases . . . [Re: Blapper] #280992
10/26/09 8:33 pm
10/26/09 8:33 pm
Joined: Sep 2006
Posts: 731
Melbourne Fl
T
Terry_tr6 Offline
BritBike Forum member
Terry_tr6  Offline
BritBike Forum member
T
Joined: Sep 2006
Posts: 731
Melbourne Fl
considering that the bearing isn't sealed and the outer race would occlude the holes anyway, i'd forgo the JB(and that's saying a lot from me) and eliminate the chance of it coming loose. the holes thru the bearings are a lot bigger than the ones in the case even if they weren't blocked by the race

Re: Opinions on a pair of butchered crank cases . . . [Re: RossP] #280998
10/26/09 9:21 pm
10/26/09 9:21 pm
Joined: Jul 2009
Posts: 3,549
Vic. Australia
P
Pete R - R.I.P. Offline
In Remembrance
Pete R - R.I.P.  Offline
In Remembrance
P
Joined: Jul 2009
Posts: 3,549
Vic. Australia
As long as the holes are carefully de-burred at the bearing locating shoulder,I can't see a problem.
Normally,if you heat the case to running temperature,or a little beyond,and drop it on a block of wood these bearings will just fall out.Maybe this one was a little tighter,and you may have more crush on the bearing.If you use the proper C-3 clearance bearing,you should still have some bearing clearance when the engine is cold(do check this).

If you wanted to run a sealed primary,you'd have more holes than this to tap out and plug up.

Re: Opinions on a pair of butchered crank cases . . . [Re: Pete R - R.I.P.] #281006
10/26/09 10:23 pm
10/26/09 10:23 pm
Joined: Dec 2007
Posts: 259
australia
D
douglas Offline
BritBike Forum member
douglas  Offline
BritBike Forum member
D
Joined: Dec 2007
Posts: 259
australia
They're stuffed! Send them to me,i have this huge back garden to bury them!

Re: Opinions on a pair of butchered crank cases . . . [Re: douglas] #281016
10/26/09 11:13 pm
10/26/09 11:13 pm
Joined: Mar 2005
Posts: 10,022
Boston, Massachusetts
J
John Healy Online content

BritBike Forum member
John Healy  Online Content

BritBike Forum member
J
Joined: Mar 2005
Posts: 10,022
Boston, Massachusetts
There is a Triumph TriCor service bulletin describing drilling these holes when you run into a situation when you run into a drive side roller bearing that will not come out using heat. If you heat the entire crankcase, this bearing will typically fall out like Pete described above. If you heat the entire case to 225 to 250F you will find the bearing easily removed.

The mistake most people make is to localize the heat to the area around the bearing. Because the aluminum around the heated area isn't expanding in concert with the area around the bearing, the aluminum extensibly can only expand inward and bearing housing actually gets tighter around the bearing. You can throw enough heat at the casting doing it this way (450F plus), but it is kinder to heat the entire crankcase.
John


Re: Opinions on a pair of butchered crank cases . . . [Re: John Healy] #281072
10/27/09 7:42 am
10/27/09 7:42 am
Joined: Sep 2002
Posts: 139
Derbyshire
R
RossP Offline OP
BritBike Forum member
RossP  Offline OP
BritBike Forum member
R
Joined: Sep 2002
Posts: 139
Derbyshire
Thanks for that John, I've luckily never come across a drive side bearing that wouldn't come out easily with a bit of heat - can usually get the cases up to temperature just using a hot air paint stripping gun. Other than that they go in the oven!

It being mentioned in the service bulletin is re-assuring, and I'm tempted to just run the cases as they are. But I'm also interested in your views on whether the holes are likely to raise the chances of the cases/bearing failing.

I'd say the purpose of the part of the bearing housing thats been drilled is more to hold the seal than support the bearing - but that could just be wishful thinking on my part!

Cheers
Ross


Moderated by  John Healy 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.6.1.1