Jump to content

Heating of crankcase to 120c for crankcase bearing installation, will this damage the magneto seal?


garydwall
 Share

Recommended Posts

Hello, I need to install my new bearings. I've watched Jim snells video which is great help. 

I'm just wondering when I heat the left crankcase is it ok to have the magneto seal already fitted? The seal must be fitted before the bearing. 

Can it withstand this temperature?

Thank you very much.

Gary20220526_210826.thumb.jpg.d03ae4fdb7b6f81d927dbae259eb29f7.jpg

Link to comment
Share on other sites

 

 

Viton seals are usually but not always brown and that looks brown.

I see that it says Gas Gas on the bearing and it looks quite wide in the picture.  Is it a roller bearing?  Why did Gas Gas go to the trouble of a custom bearing?  Is there a ball bearing on the other side?

 

Link to comment
Share on other sites

 

I would say ordinary NBR seals are fully adequate. Use original seals and bearings. Take seal out then heat the halves with hot air gun or similar (gasol?). Check temperature with an IR thermometer. I guess 100C is good. Later when putting the crankshaft back you may heat the bearing(s) to max 150C  (no more). Check with IR termometer(IR thermometer is important). IR thermometers are not expensive nowadays.

  • Thanks 1
Link to comment
Share on other sites

 
 
 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
  • Create New...