|
|
5 Jul 2009
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: May 2009
Posts: 235
|
|
Sorry to see this. Not good.
The bearing is probably made of harder steel than the crankshaft. It is more likely that the crankshaft suffered if the bearing temporary seized, causing the crankshaft to rotate in the inner bearing race. Sorry.
I would not rule out completely the chance of something else being responsible for the vibrations. Obviously you need to address this problem, but please take a good look at everything else to be sure.
Weird though… I would have expected the crankshaft to have welded itself to the bearing race by now. I have twice seen similar things, in one case the inner bearing race of a wheel bearing was welded to the axle after a temporary bearing seizure, and in the other case a primary sprocket had welded itself on a crankshaft after the key had snapped. Not the main bearings on a crankshaft in either case though. I remember that several years ago some of the GASGAS two-stroke enduro models had a flaw, the crankshafts could slide side-to-side in the main bearings, or at least one of them. I don’t think there was any noticeable play, but at least some of the flawed engines did run fine for a long time…. Guess the friction in the bearing itself was less than the friction between the crankshaft and inner bearing races given the pressure put on the crankshaft in a running engine...
__________________
----------
Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
|
5 Jul 2009
|
Registered Users
Veteran HUBBer
|
|
Join Date: Jul 2001
Location: Bmth, UK
Posts: 148
|
|
yes, its not good is it
I need to take a look at the other side, I got the alternator rotor nut off (bastard tight as it should be) now all I need is a suitable puller, can anyone recomend where I can get one, or dimensions to make one
I'm in two minds what to do about the main bearings on the crank, obviously a full bottom end rebuild is needed but as we are in the middle of summer I may try a short term fix - get some very strong thread lock and squirt between the inner race and crank.
If glueing the bearing to the crank works then I'll leave the rebuild till the winter. it should also diagnose if this is where the vibration is coming from. it could be that the motor gets to certain revs then the crank starts oscillating in the bearing.
cheers for all the help so far from everyone
Last edited by Lamin Sambou; 5 Jul 2009 at 14:20.
Reason: typo
|
5 Jul 2009
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: May 2009
Location: uk
Posts: 434
|
|
undo the 3 allen head bolts that hold it to the starter clutch and use them in the 3 threaded holes in the flywheel you might need to rotate the starter clutch so there is something behind all 3 of them threaded holes then tighten those bolts staggering the sequence so you apply even pressure put the main nut on the end of the crank a few threads and give it a tap when you have quite a bit of tension on those 3 bolts it should shock it free.
__________________
XT 630 SUPERMOTO
GSXR750L KMX200
RF900 & GSX400X Impulse Projects
3.9 V8 Rangerover
|
5 Jul 2009
|
Registered Users
Veteran HUBBer
|
|
Join Date: Jul 2001
Location: Bmth, UK
Posts: 148
|
|
Quote:
Originally Posted by wolfzero
undo the 3 allen head bolts that hold it to the starter clutch and use them in the 3 threaded holes in the flywheel you might need to rotate the starter clutch so there is something behind all 3 of them threaded holes then tighten those bolts staggering the sequence so you apply even pressure put the main nut on the end of the crank a few threads and give it a tap when you have quite a bit of tension on those 3 bolts it should shock it free.
|
my bikes kick only....so no sprag clutch...can I still wind some M8 bolts through the 3 holes, what will they press against?
cheers
|
5 Jul 2009
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: May 2009
Location: uk
Posts: 434
|
|
my bad thought you had e/start and kick
post a pic and ill work it out from that
__________________
XT 630 SUPERMOTO
GSXR750L KMX200
RF900 & GSX400X Impulse Projects
3.9 V8 Rangerover
|
5 Jul 2009
|
Registered Users
Veteran HUBBer
|
|
Join Date: Jul 2001
Location: Bmth, UK
Posts: 148
|
|
Quote:
Originally Posted by wolfzero
my bad thought you had e/start and kick
post a pic and ill work it out from that
|
looks like something like this is needed
,
actually I think I have something like that buried somewhere....
|
5 Jul 2009
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: May 2009
Location: uk
Posts: 434
|
|
i meant post a pic of your engine
i got a puller same as that from machine mart tho
__________________
XT 630 SUPERMOTO
GSXR750L KMX200
RF900 & GSX400X Impulse Projects
3.9 V8 Rangerover
|
6 Jul 2009
|
Registered Users
Veteran HUBBer
|
|
Join Date: Jul 2001
Location: Bmth, UK
Posts: 148
|
|
flywheel puller
Quote:
Originally Posted by wolfzero
i meant post a pic of your engine
i got a puller same as that from machine mart tho
|
I found my puller and have it on the flywheel, I've done it up 'kin tight but nothings moving.
any tips? I've tried a bit of heat, but don't want to resort to hammer.
cheers
|
6 Jul 2009
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: May 2009
Location: uk
Posts: 434
|
|
as long as you protect the threads using a hammer is not a problem it probably just needs a whack to shock it free if your puller is similar to the one in the pic give it some torque and then give that center bolt a big 'kin whack i'd put the end nut loose on the crank so when it comes free it doesn't come flying off.
__________________
XT 630 SUPERMOTO
GSXR750L KMX200
RF900 & GSX400X Impulse Projects
3.9 V8 Rangerover
|
6 Jul 2009
|
Registered Users
Veteran HUBBer
|
|
Join Date: Jul 2001
Location: Bmth, UK
Posts: 148
|
|
pulling flywheel off
I tried more heat whilst under tension from the puller and it flew off with a bang. -I didn't leave the nut on....
the bearing that side is seems OK, I'm gonna use the thread lock to hold the crank in the bearing on the other side and see what its like.
what about the big end - can it be checked without taking top end off.
cheers
|
7 Jul 2009
|
|
Registered Users
Veteran HUBBer
|
|
Join Date: May 2009
Location: uk
Posts: 434
|
|
Quote:
Originally Posted by Lamin Sambou
what about the big end - can it be checked without taking top end off.
cheers
|
only if you have a dial gauge with an extension rod but you might be able to knock something up with an old spark plug a rod and a ruler to measure any backlash.
__________________
XT 630 SUPERMOTO
GSXR750L KMX200
RF900 & GSX400X Impulse Projects
3.9 V8 Rangerover
|
Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Check the RAW segments; Grant, your HU host is on every month!
Episodes below to listen to while you, err, pretend to do something or other...
2020 Edition of Chris Scott's Adventure Motorcycling Handbook.
"Ultimate global guide for red-blooded bikers planning overseas exploration. Covers choice & preparation of best bike, shipping overseas, baggage design, riding techniques, travel health, visas, documentation, safety and useful addresses." Recommended. (Grant)
Ripcord Rescue Travel Insurance™ combines into a single integrated program the best evacuation and rescue with the premier travel insurance coverages designed for adventurers.
Led by special operations veterans, Stanford Medicine affiliated physicians, paramedics and other travel experts, Ripcord is perfect for adventure seekers, climbers, skiers, sports enthusiasts, hunters, international travelers, humanitarian efforts, expeditions and more.
Ripcord travel protection is now available for ALL nationalities, and travel is covered on motorcycles of all sizes!
What others say about HU...
"This site is the BIBLE for international bike travelers." Greg, Australia
"Thank you! The web site, The travels, The insight, The inspiration, Everything, just thanks." Colin, UK
"My friend and I are planning a trip from Singapore to England... We found (the HU) site invaluable as an aid to planning and have based a lot of our purchases (bikes, riding gear, etc.) on what we have learned from this site." Phil, Australia
"I for one always had an adventurous spirit, but you and Susan lit the fire for my trip and I'll be forever grateful for what you two do to inspire others to just do it." Brent, USA
"Your website is a mecca of valuable information and the (video) series is informative, entertaining, and inspiring!" Jennifer, Canada
"Your worldwide organisation and events are the Go To places to for all serious touring and aspiring touring bikers." Trevor, South Africa
"This is the answer to all my questions." Haydn, Australia
"Keep going the excellent work you are doing for Horizons Unlimited - I love it!" Thomas, Germany
Lots more comments here!
Diaries of a compulsive traveller
by Graham Field
Book, eBook, Audiobook
"A compelling, honest, inspiring and entertaining writing style with a built-in feel-good factor" Get them NOW from the authors' website and Amazon.com, Amazon.ca, Amazon.co.uk.
Back Road Map Books and Backroad GPS Maps for all of Canada - a must have!
New to Horizons Unlimited?
New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!
Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80G/S.
Read more about Grant & Susan's story
Membership - help keep us going!
Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events all over the world with the help of volunteers; we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.
You don't have to be a Member to come to an HU meeting, access the website, or ask questions on the HUBB. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.
|
|
|