Husaberg
Go Back   Husaberg Forum > Mechanical and Technical > Mechanical

Mechanical Mechanical Forum - spinning bits and gyrating bobs


Reply
 
LinkBack Thread Tools Display Modes
July 5th, 2008, 10:00 AM   #1
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 16,062
Thanks: 503

I Ride: Husaberg FE501e 2003
mains fit on the crank

just asking aloud what is the engineering code that a main bearing should fit onto a crank? someone said to me K7 but i'm not really sure?

regards

Taffy
Taffy is offline  
 
July 5th, 2008, 02:41 PM   #2
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 16,062
Thanks: 503

I Ride: Husaberg FE501e 2003
RE: mains fit on the crank

maybe you guys can get a better journal up than this one:

http://idmru.aston.ac.uk/IDMru.nsf/2eb7 ... %20Drg.PDF

but at least it shows a basic guide to the engineering problems. if you look at the third page it indicates that gears have to be a greater interference fit than bearings yet the bearing has to go past the gears position to get to the shoulder of the crank?

what an engineering dilemma!

regards

Taffy
Taffy is offline  
July 6th, 2008, 01:27 AM   #3
Senior Member
 
Joined: Sep 2006
From: Hayle Cornwall

Posts: 987
Thanks: 22

I Ride:
Re: RE: mains fit on the crank

Originally Posted by Taffy
maybe you guys can get a better journal up than this one:

http://idmru.aston.ac.uk/IDMru.nsf/2eb7 ... %20Drg.PDF

but at least it shows a basic guide to the engineering problems. if you look at the third page it indicates that gears have to be a greater interference fit than bearings yet the bearing has to go past the gears position to get to the shoulder of the crank?

what an engineering dilemma!

regards

Taffy
Hi Taffy,

I suppose it depends on what type of bearing you are using Standard to C4, I rebuilt mine with C4 ball bearings and when the cases came together they were I would say just over an interference fit, no thwacking with mallets or anything just small taps to get every thing lined up, then when bolted up one sharp tap with a hide mallet on the ignition side of the crank just to centralise the bearing spun as free a bird. An still going strong over 2000 miles later.
Do the pre04 crank journals measure a tighter fit than the later type?.

Regards

Sparks.
sparks is offline  
July 6th, 2008, 08:00 AM   #4
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 16,062
Thanks: 503

I Ride: Husaberg FE501e 2003
RE: Re: RE: mains fit on the crank

they're all tight steve. they have had problems post '03 as well as before.

i did find a better site but hope we'll discuss this here.

regards

Taffy
Taffy is offline  
Reply

  Husaberg Forum > Mechanical and Technical > Mechanical

Tags
crank, fit, mains



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
570 mains berglsmerg Mechanical 6 August 4th, 2013 03:36 AM
Rebuilding Engine, checking mains, rod... VIDEOS hyebo Mechanical 0 May 10th, 2013 08:16 AM
crank locking bolt and crank twist bushmechanic Mechanical 25 February 6th, 2009 12:02 PM
crank pin fitment and crank twist especially on the 650's! Taffy Mechanical 2 November 7th, 2008 03:41 PM
chain tension and mains? Taffy Mechanical 8 February 23rd, 2008 04:27 AM


Facebook Twitter Google+ RSS Feed