Husaberg
Go Back   Husaberg Forum > Mechanical and Technical > Mechanical

Mechanical Mechanical Forum - spinning bits and gyrating bobs


Reply
 
LinkBack Thread Tools Display Modes
April 5th, 2005, 08:09 AM   #1
Senior Member
 
Joined: Mar 2004
From: USA

Posts: 363
Thanks: 1

I Ride:
Correct crankshaft end play/axial clearence?

Hi all,
Who has a definative answer on the proper crankshaft end play/axial clearence for the upgraded cylindrical roller main bearings? The motor service guide states for the 2003 crank with roller bearings that the clearence should be 0.25-0.30mm for 400-550cc engines and 0.30-0.35mm for 650cc engines, but the roller bearing upgrade service bulletin and KTM's with the same main bearings say 0.10-0.20mm.

thanks.
PowerFiend is offline  
 
April 5th, 2005, 08:34 AM   #2
Senior Member
 
LINEAWEAVER's Avatar
 
Joined: Jul 2001
From: El Sobrante, Ca. 94803

Posts: 3,249
Thanks: 1

I Ride:
Ultimately .004" - .008"
Of equal if not more importance is axial bore alighnment and race fit.



Best Regards,
Dale
LINEAWEAVER is offline  
April 5th, 2005, 09:12 AM   #3
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 15,652
Thanks: 447

I Ride: Husaberg FE501e 2003
that's 0.1-0.2mm is the metric equivelant powerfeind. so i guess KTM may be the boys to follow here.

should i put this in the owners doc?

Taffy
Taffy is online now  
April 5th, 2005, 09:15 AM   #4
Senior Member
 
nsman's Avatar
 
Joined: Oct 2004
From: nova scotia

Posts: 1,340
Thanks: 14

I Ride:
Dale,
If in fact the axial bore alignment is out .What is the procedure to correct this,machining the cases and making a off-set bushing or is it possible to machine or order a off-set bearing.I see from your photo that you check this spec with a mandrel, is this something you made yourself or a purchase item.On a side note, a Yamaha Br250(snowmobile)has a plastic(or nylon) bushing between the crankcase and the crank bearing,is this to allow a certian amount of tolerance for a out of alignment set of cases?On the berg engine how much out of alignment can a ball bearing tolerate before it causes excess wear?Sorry for so many questions,just got carried away!.....nsman
nsman is offline  
April 5th, 2005, 09:24 AM   #5
Senior Member
 
LINEAWEAVER's Avatar
 
Joined: Jul 2001
From: El Sobrante, Ca. 94803

Posts: 3,249
Thanks: 1

I Ride:
Hi Nsman,
My personal procedure for correcting axial misalignment is that of boring the offending case via a pilot indexed from the opposite case then fitting an OS outer race.

The arbor is homemade.

The ball is far more tolerant of axial misalignment then that of the roller bearing. (Hence the sudden onset of failure regarding early model 650 main bearings)

The mandrel is ground .0006" -.0008" undersize to that of the specified inner race ID.

Hope this has answered your questions.

Kind Regards,
Dale
LINEAWEAVER is offline  
April 5th, 2005, 10:02 AM   #6
Senior Member
 
nsman's Avatar
 
Joined: Oct 2004
From: nova scotia

Posts: 1,340
Thanks: 14

I Ride:
Yes, thank you again......nsman
nsman is offline  
April 5th, 2005, 10:07 AM   #7
Senior Member
 
Joined: Mar 2004
From: USA

Posts: 363
Thanks: 1

I Ride:
Thanks all.
PowerFiend is offline  
April 6th, 2005, 01:13 AM   #8
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 15,652
Thanks: 447

I Ride: Husaberg FE501e 2003
Dale

you talk of "an oversize outer race". how does that go?
you get the cases measured first, you decide whether there is need of the work?
you order oversize bearings whilst the work is under way.

so can i ask what the code of the o/s bearings is? or is it a 'doddle' and in the bearings (stock) list?

regards

Taffy
Taffy is online now  
April 6th, 2005, 09:28 AM   #9
Senior Member
 
LINEAWEAVER's Avatar
 
Joined: Jul 2001
From: El Sobrante, Ca. 94803

Posts: 3,249
Thanks: 1

I Ride:
Originally Posted by Taffy
Dale

you talk of "an oversize outer race". how does that go?
you get the cases measured first, you decide whether there is need of the work?
you order oversize bearings whilst the work is under way.

so can i ask what the code of the o/s bearings is? or is it a 'doddle' and in the bearings (stock) list?

regards

Taffy
Hi Taffy,
Most often the right crankcase bore is undersize to begin with and as a result I can often axial align said bore and still provide proper interference fit of the outer race.

In the rare occurrence that I must use an OS outer race:
I phone my bearing supplier, whom in return phones his bearing supplier, whom contacts the manufacturer, whom alters the outer race OD specifications prior to final grinding. Some of the major bearing distributors have unfinished bearings on the shelf awaiting final sizing. I bore the case to fit once I have received said bearing. Such is indeed a big pain, fortunately most of the time I can get away with a tighter bearing running clearance (C2 as opposed to that of C3, etc.) with a slightly enlarged outer race case bore that has been properly aligned.

pheeeeeew! You are wearing me out Taffy

Now please, tell all just how pretty that new LRX2 camshaft is and that if it performs just half that of its appearance it will be a true gem

Best Regards,
Dale
LINEAWEAVER is offline  
April 6th, 2005, 02:57 PM   #10
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 15,652
Thanks: 447

I Ride: Husaberg FE501e 2003
aaah dale, indeed-a work of art sir! you look at it and it's all one shade of creamy grey. a lot of work went into it for sure!

but like all racers i have to be patient sir! only change one thing at a time.

i went through the teeny process of a rekluse clutch and straight to a LHRB system last sunday. got used to it after half a lap. because it was a time card event i knew that i had time to faff the firsat two laps and by the end of those two i was dialed in!

i'm adjusting the ignition this week and the clutch engagement. as the nights are drawing out i will try to get that done as a bit of mid week green laning!

if satisfied i then have the camshaft to fit. 35/29 later after that.

must ask you though dale. with the cam and FCR39 and the 29mm exhaust valves; which headers will it be ready for/ the 501/550s at 28mm i/d or the 650s at 32mm i/d?

the results with the cam will be mentioned here for sure.

regards

Taffy
Taffy is online now  
Reply

  Husaberg Forum > Mechanical and Technical > Mechanical

Tags
clearence, correct, crankshaft, end, play or axial



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Crank axial play check and flywheel change kli Mechanical 3 August 28th, 2012 10:17 PM
Rockers axial play way out of limit kli Mechanical 5 October 22nd, 2011 06:39 AM
heads up 628 rod clearence bushmechanic Mechanical 0 February 13th, 2010 01:30 PM
clutch axial play, and kickstarter wille Mechanical 2 February 5th, 2009 09:39 AM
fe550 valve clearence squarehead2 Mechanical 2 March 8th, 2007 05:17 PM


Facebook Twitter Google+ RSS Feed