primary gear bearing

Moderator: The Midas Forum Staff

primary gear bearing

Postby max midas » Tue Oct 26, 2010 11:40 pm

Does anyone have a secret they're willing to share as to how to keep the primary gear from binding on the crank?
I've had new bushes installed, line bored to the correct tolerances, the end float was on the ever so slightly conservative side of ideal, I put a dab of cam lube on the bushes to help them spin before the oil could lubricate them. And yet still I can't select a gear when the engine has warmed up.
Am getting really cheesed off with this!
max midas
 
Posts: 181
Joined: Tue Dec 02, 2008 11:32 pm
Location: somewhere under the engine - again!

Re: primary gear bearing

Postby Stuart » Wed Oct 27, 2010 9:58 am

I've not much experience with this, but do remember the double floating bush being talked about years ago

http://www.minispares.com/Product.aspx?ty=pb&pid=34676
User avatar
Stuart
 
Posts: 1719
Joined: Tue Dec 02, 2008 8:29 pm
Location: Derbyshire

Re: primary gear bearing

Postby max midas » Wed Oct 27, 2010 12:12 pm

Thanks Stuart, I'd heard of that idea, the people selling the floating bush concept are the only voices on the subject I've heard, just wondered if anyone else had any opinions on the floating bush, or any other method.
max midas
 
Posts: 181
Joined: Tue Dec 02, 2008 11:32 pm
Location: somewhere under the engine - again!

Re: primary gear bearing

Postby max midas » Sat Jan 22, 2011 11:00 pm

I took the plunge and installed the floating bush. What a difference! My problems are solved (at least for now).
It's so easy to slip into any gear, no matter what the revs, or the temperature (if you've had primary gear problems, you'll understand the relevance of these statements).
I heartily recommend the conversion to all with an A series engine.
max midas
 
Posts: 181
Joined: Tue Dec 02, 2008 11:32 pm
Location: somewhere under the engine - again!

Re: primary gear bearing

Postby ACDodd » Wed Feb 15, 2012 8:02 pm

Ideal clearances for bushes are 0.0045 to 0.005" and soak the completed gear in engine oil for 48 hours before fitting.

This should solve your issues.

AC
ACDodd
 
Posts: 32
Joined: Wed Dec 31, 2008 11:15 am

Re: primary gear bearing

Postby max midas » Thu Feb 16, 2012 2:02 pm

Thanks AC, am glad to report that I've had over 12 months trouble free motoring with this floating bush, so can confidently say (with fingers ever crossed) that it works.
max midas
 
Posts: 181
Joined: Tue Dec 02, 2008 11:32 pm
Location: somewhere under the engine - again!


Return to Miscellaneous

Who is online

Users browsing this forum: No registered users and 1 guest

cron