Trouble joining cases - Triumph Forum: Triumph Rat Motorcycle Forums
Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old 08-30-2012, 03:26 PM Thread Starter
Member
Grand Prix 250
Main Motorcycle: 1973 Triumph TR7RV
 
Join Date: Jul 2012
Location: Bethany, Connecticut United States
Posts: 79
Other Motorcycle: 1969 TR6R; 1967 TR6C
Trouble joining cases

I've hit a new wall in my TR7 engine rebuild.

I tried to put my case halves together today. I started by introducing the crank to the drive side case (per Hughie Hancox's DVD), then attempted to mate the drive side case and crank with the timing side. Unfortunately the crank shaft would not fully insert into the timing side main bearing, and the gasket sealer dried too much (I think...). There was a little more than half an inch to go before it was fully home. Now, I can't get it all back apart because the shaft seems stuck in the timing side bearing. Before I figure out why exactly it's not going together, I need to get this thing apart. I gave each end of the crank shaft some firm whacks with a plastic mallet with no success.

I'm using ThreeBond 1104. Anyone know how long my window of opportunity is to get the cases joined up? The tube says dry for approx one minute before joining. That's a pretty small window...

Thanks for helping out.
Miller261 is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 08-30-2012, 04:32 PM Thread Starter
Member
Grand Prix 250
Main Motorcycle: 1973 Triumph TR7RV
 
Join Date: Jul 2012
Location: Bethany, Connecticut United States
Posts: 79
Other Motorcycle: 1969 TR6R; 1967 TR6C
Never mind! I got it apart. What a pain in the butt.

I warmed it up a bit and hit with more resolve from the timing side. Eventually it came apart. My worry was that the bearing would come out with the shaft, since I obviously have too much interference between the journal and timing side MB. Luckily the bearing is still seated ok.

Thanks.
Miller261 is offline  
post #3 of 10 (permalink) Old 08-30-2012, 05:24 PM
TE Lifetime Contributor
Team Owner
Main Motorcycle: Rickman T120
 
Join Date: May 2010
Location: Victoria Australia
Posts: 4,721
Other Motorcycle: T160,TR6
I'd recommend using the 3-piece roller bearing on the timing side.It's a stronger bearing,and it makes assembly very easy.
You can also easily check end-float before the crank pinion is tightened.
I use Loctite 515 sealant.It will not set until the cases are closed.
Mr.Pete is offline  
post #4 of 10 (permalink) Old 08-30-2012, 05:42 PM Thread Starter
Member
Grand Prix 250
Main Motorcycle: 1973 Triumph TR7RV
 
Join Date: Jul 2012
Location: Bethany, Connecticut United States
Posts: 79
Other Motorcycle: 1969 TR6R; 1967 TR6C
Thanks, Mr Pete.

Can you send me a link or two to the bearing?
Miller261 is offline  
post #5 of 10 (permalink) Old 08-31-2012, 06:35 PM
TE Lifetime Contributor
Team Owner
Main Motorcycle: Rickman T120
 
Join Date: May 2010
Location: Victoria Australia
Posts: 4,721
Other Motorcycle: T160,TR6
The Triumph part number for the bearing is 60-7362.
RHP bearing number NUP 306 ETCN.
CN only refers to "normal" internal clearance.

You might find this interesting too;http://www.triumphrat.net/classic-vi...f-t140v-3.html
Mr.Pete is offline  
post #6 of 10 (permalink) Old 09-01-2012, 01:20 PM Thread Starter
Member
Grand Prix 250
Main Motorcycle: 1973 Triumph TR7RV
 
Join Date: Jul 2012
Location: Bethany, Connecticut United States
Posts: 79
Other Motorcycle: 1969 TR6R; 1967 TR6C
Got it together yesterday with the standard ball bearing. My method: I polished the crank shaft journal more thoroughly, knocking down a little booger (almost undetectable to the eye and finger) with some fine emery. I staged all my hardware. I lightly heated the timing side case and bearing until the bearing had obviously expanded. I spread the Three Bond as neatly and expeditiously as possible, moved quickly, and voila. Everything is together and turning exactly as it should.

Yes, that thread is very interesting.

I am lucky because this low-mileage motor had never been apart before I dug into it, so I got to see exactly what it looked like from the factory. I have been taking my time, taking copious pictures and notes, and sparing no expense on parts. Here and there I have found deviations from the parts book and workshop manual, but I trust the way it was together before I trust the diagram.
Miller261 is offline  
post #7 of 10 (permalink) Old 11-22-2012, 07:34 PM
Senior Member
World SuperBike
Main Motorcycle: 1999 T'Bird Sport
 
lovecuba's Avatar
 
Join Date: Apr 2007
Location: Rangiora, New Zealand
Posts: 2,281
Other Motorcycle: 1977 T140
Crankcase Assembly

Quote:
Originally Posted by Miller261 View Post
Got it together yesterday with the standard ball bearing. My method: I polished the crank shaft journal more thoroughly, knocking down a little booger (almost undetectable to the eye and finger) with some fine emery. I staged all my hardware. I lightly heated the timing side case and bearing until the bearing had obviously expanded. I spread the Three Bond as neatly and expeditiously as possible, moved quickly, and voila. Everything is together and turning exactly as it should.

Yes, that thread is very interesting.

I am lucky because this low-mileage motor had never been apart before I dug into it, so I got to see exactly what it looked like from the factory. I have been taking my time, taking copious pictures and notes, and sparing no expense on parts. Here and there I have found deviations from the parts book and workshop manual, but I trust the way it was together before I trust the diagram.
Followed your procedure, using a little heat also, c/shaft entered timing bearing with a little rubber hammer persausion, all good and buttoned up nicely.
lovecuba is offline  
post #8 of 10 (permalink) Old 11-22-2012, 11:56 PM Thread Starter
Member
Grand Prix 250
Main Motorcycle: 1973 Triumph TR7RV
 
Join Date: Jul 2012
Location: Bethany, Connecticut United States
Posts: 79
Other Motorcycle: 1969 TR6R; 1967 TR6C
Great! Did you use the 3 piece bearing or the standard one?
Miller261 is offline  
post #9 of 10 (permalink) Old 11-23-2012, 03:17 AM
Senior Member
World SuperBike
Main Motorcycle: 1999 T'Bird Sport
 
lovecuba's Avatar
 
Join Date: Apr 2007
Location: Rangiora, New Zealand
Posts: 2,281
Other Motorcycle: 1977 T140
Joining up Cases

Quote:
Originally Posted by Miller261 View Post
Great! Did you use the 3 piece bearing or the standard one?
Used a heavy duty (11) ball bearing.
lovecuba is offline  
post #10 of 10 (permalink) Old 11-23-2012, 04:03 AM
Senior Member
Powerbike
Main Motorcycle: '74 T140V Chop
 
Join Date: Jul 2012
Location: Woodbridge, UK
Posts: 388
May as well stick my $0.02 here.

Heating up casings/hitting them hard can warp them causing leaks. Worse than that, hitting a casing over a bearing could damage them. To the untrained hand, it'll feel fine. It could fail earlier than you would hope.

Always do everything gently. If you need to hit it, there's a good chance something isn't right.

If you DO need to force it in, use a press.
loxx101 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options
All posts must adhere to Forum Rules

Register Now



In order to be able to post messages on the Triumph Forum: Triumph Rat Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter your valid email address, that can receive an automated confirmation message. Otherwise, you won't be able to gain full access.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Joining from NYC. rich.burdon The Welcome Center 1 03-13-2011 02:49 PM
Joining RAT?? blabride Air Cooled Twins Talk 12 08-05-2010 11:21 AM
Joining BIR rvman Air Cooled Twins Technical Talk 38 04-24-2007 09:30 AM
trade my thrux side cases for your bonnie cases flynbulldog1 Air Cooled Twins Talk 1 03-21-2006 04:39 PM
Joining R.A.T bosoxrider Air Cooled Twins Talk 10 06-23-2005 01:03 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome