Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Yamaha Tech
XT600 Engine rebuild questions (crank, bearings, valveseals etc) XT600 Engine rebuild questions (crank, bearings, valveseals etc)
Register FAQ Calendar Today's Posts
Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by George Guille, It's going to be a long 300km... Bolivian Amazon

I haven't been everywhere...
but it's on my list!


Photo by George Guille
It's going to be a long 300km...
Bolivian Amazon



Like Tree5Likes

Reply
Page 3 of 6 12 3 456
 
LinkBack Thread Tools Display Modes
  #31  
Old 27 Jan 2019
Registered Users
Veteran HUBBer
  
Join Date: Jun 2017
Posts: 145
Quote:
Originally Posted by jjrider View Post
That's .002" less but still .0118" clearance (SAE since I'm used to it) , it'll be ok .




.
Thanks. 10W40 fine with the above in mind?
Reply With Quote
  #32  
Old 28 Jan 2019
Registered Users
Veteran HUBBer
  
Join Date: May 2013
Location: Wisconsin, USA
Posts: 827
Yup .



.
__________________
'86 XT600/3TB motor,,, '88 XT600, ,,'92 XT600e,,, '08 Husky TE510,,, '05 DRZ463,,, '95 KLX650 ,,,'96 KLX650
Reply With Quote
  #33  
Old 28 Jan 2019
Registered Users
Veteran HUBBer
  
Join Date: Jun 2017
Posts: 145
I just found out that in a XT600Z service information it clearly states 0.25-0.75mm big-end clearance, while in the XT600 EAC 1990 service manual it states 0.35-0.65mm. I thought the 600 engine core (crank, piston etc.) was pretty much identical for all models. Does someone have any idea?
Last edited by Doubleyoupee; 28 Jan 2019 at 16:22.
Reply With Quote
  #34  
Old 28 Jan 2019
Registered Users
Veteran HUBBer
  
Join Date: Feb 2012
Location: Milan, Italy
Posts: 562
Quote:
Originally Posted by jjrider View Post
That's .002" less but still .0118" clearance (SAE since I'm used to it) , it'll be ok .




.
+1, you should be fine
do a dry mount of the crank in cases, button them up and see if it turns freely to be sure
Reply With Quote
  #35  
Old 28 Jan 2019
Registered Users
Veteran HUBBer
  
Join Date: Jun 2017
Posts: 145
Quote:
Originally Posted by turboguzzi View Post
+1, you should be fine
do a dry mount of the crank in cases, button them up and see if it turns freely to be sure
Wel unfortunately it's not.
I just found out the big-end pin is now touching the bearing:



My understanding is that the bearing should be placed all the way against the crankshaft, although there will be some clearance because of a small shoulder that prevents the inner race of the bearing from going any further. Correct?

Either way, it's now rubbing against the pin as you can see in the picture... so I brought it back to be adjusted.. if possible (i've already removed the timing gear).
Reply With Quote
  #36  
Old 28 Jan 2019
Registered Users
Veteran HUBBer
  
Join Date: Feb 2012
Location: Milan, Italy
Posts: 562
havent changed a left bearing in a while and too many other motors open to remeber, but a crank that i have here has a good 2.4 distance between pin and bearing
im afraid there should be a washer between bearing and crank, the parts list wil not show it because its one assy
no way a few tenths mistake would cancel a 2.4mm gap..
Attached Thumbnails
XT600 Engine rebuild questions (crank, bearings, valveseals etc)-img_20190128_201835.jpg  

Reply With Quote
  #37  
Old 28 Jan 2019
Registered Users
Veteran HUBBer
  
Join Date: Feb 2012
Location: Milan, Italy
Posts: 562
had a look in better light, not sure it's a washer. it might be that the bearing should have no radius so it stops at the shoulder sharp. maybe you mounted a non original bearing that has a radius? then it would sit more inwards...
Last edited by turboguzzi; 28 Jan 2019 at 20:27.
Reply With Quote
  #38  
Old 28 Jan 2019
Registered Users
Veteran HUBBer
  
Join Date: Jun 2017
Posts: 145
Quote:
Originally Posted by turboguzzi View Post
had a look in better light, not sure it's a washer. it might be that the bearing should have no radius so it stops at the shoulder sharp. maybe you mounted a non original bearing that has a radius? then it would sit more inwards...
I already removed the bearing and there is no washer. There is a small shoulder that the inner race of the bearing sits against. That's why there's a gap between the crank and bearing.
There's still a gap for me, but not at the pin. The pin touches the bearing directly. I think it's the original bearing (it's a Koyo).

Either way, it wasn't touching the bearing before. It's because the crank was pressed 0.6mm inwards, so the pin protrudes more and touches the bearing now.
Reply With Quote
  #39  
Old 28 Jan 2019
xtrock's Avatar
Registered Users
Veteran HUBBer
  
Join Date: May 2013
Location: Norway
Posts: 1,325
If service manual states 0.35-0.65mm i would for sure use it in the correct value and not hope its ok outside.. But what i find strange here is the shop you had to do this, they must have seen that the bearing touched?They maybe didnt have all parts?
Reply With Quote
  #40  
Old 28 Jan 2019
Registered Users
Veteran HUBBer
  
Join Date: Jun 2017
Posts: 145
Quote:
Originally Posted by xtrock View Post
If service manual states 0.35-0.65mm i would for sure use it in the correct value and not hope its ok outside.. But what i find strange here is the shop you had to do this, they must have seen that the bearing touched?They maybe didnt have all parts?
Well actually, the XT600Z 3AJ "service information" says 0.25-0.75mm. That's what confuses me. I've never seen that mentioned anywhere else.



Reply With Quote
  #41  
Old 28 Jan 2019
xtrock's Avatar
Registered Users
Veteran HUBBer
  
Join Date: May 2013
Location: Norway
Posts: 1,325
88. Crank 1
34K-W1141-00-00


93. Crank 1
1VJ-W1141-00-00


I dont know it they had some difference spec. Anyway the bearing is not possible to move now and use again, start all over and get the gap you had before dismantle.
Reply With Quote
  #42  
Old 28 Jan 2019
Registered Users
Veteran HUBBer
  
Join Date: Feb 2012
Location: Milan, Italy
Posts: 562
even if it's 0.6 off, with a 2.4mm measured gap between pin and bearing race they shouldnt touch... it might well be that what defines the bearing position is the gear wheel and you should press the last few mm using the gear wheel as a driver so it stops at the step in diameters in the shaft. what im triyng to say is in other words that the bearing should not go all the way till the shoulder.

was there a gap between the gear wheel and bearing before you took them off?
Reply With Quote
  #43  
Old 28 Jan 2019
Registered Users
Veteran HUBBer
  
Join Date: Jun 2017
Posts: 145
Quote:
Originally Posted by turboguzzi View Post
even if it's 0.6 off, with a 2.4mm measured gap between pin and bearing race they shouldnt touch... it might well be that what defines the bearing position is the gear wheel and you should press the last few mm using the gear wheel as a driver so it stops at the step in diameters in the shaft. what im triyng to say is in other words that the bearing should not go all the way till the shoulder.

was there a gap between the gear wheel and bearing before you took them off?
What are you basing this on? Where did you get 2.4mm from? There was definitely no 2.4mm gap before. More like 0.5-1mm.

I can move the bearing axially with two screwdrivers- it's very loose on the axle. I don't know what position the bearing could be other than all the way seated on the shoulder - otherwise it will just move anyway.

Before I took them off, there was no gap between the timing gear and bearing, and around 0.5-1mm beween crank and bearing:



You can see the shoulder here:



This was before. Now it's touching the pin every so slightly because it moved 0.6mm
Reply With Quote
  #44  
Old 28 Jan 2019
xtrock's Avatar
Registered Users
Veteran HUBBer
  
Join Date: May 2013
Location: Norway
Posts: 1,325
Ok i maybe missunderstood what you wrote, but when its pressed on i would think it couldnt be moved by hand.
Reply With Quote
  #45  
Old 28 Jan 2019
Registered Users
Veteran HUBBer
  
Join Date: Jun 2017
Posts: 145
Quote:
Originally Posted by xtrock View Post
Ok i maybe missunderstood what you wrote, but when its pressed on i would think it couldnt be moved by hand.
The timing gear is pressed on. The bearing I can simply tap all the way down using no effort, just some light taps. But as you can see on the last picture - it can't go any further because there's a tapered shoulder that hits the bearing's inner race. Unfortunately now, the big end pin hits the bearing first. Just.
Reply With Quote
Reply
Page 3 of 6 12 3 456

Tags
3aj, bearings, crank, rebuild, xt600

« Previous Thread | Next Thread »

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
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Engine rebuild: what to buy and where Zergman Yamaha Tech 57 11 Nov 2017 22:41
Engine rebuild in Chile Kevinvw SOUTH AMERICA 2 14 Dec 2016 21:08
Finally, a single cylinder adventure bike colebatch Which Bike? 305 27 Aug 2015 16:04
XT600 Engine Rebuild Phoenix6 Yamaha Tech 15 2 Feb 2015 22:02
XT600E 2002 Engine Oil Trichelia Yamaha Tech 17 17 Nov 2011 14:25

 
 

Announcements

Thinking about traveling? Not sure about the whole thing? Watch the HU Achievable Dream Video Trailers and then get ALL the information you need to get inspired and learn how to travel anywhere in the world!

Have YOU ever wondered who has ridden around the world? We did too - and now here's the list of Circumnavigators!
Check it out now, and add your information if we didn't find you.

Next HU Eventscalendar

HU Event and other updates on the HUBB Forum "Traveller's Advisories" thread.
ALL Dates subject to change.

2024:

Add yourself to the Updates List for each event!

Questions about an event? Ask here

HUBBUK: info

See all event details

 
World's most listened to Adventure Motorbike Show!
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.

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.

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!



Five books by Graham Field!

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!

Your ad could be here, on EVERY page of the HUBB, or the whole website, or as many as you like!

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.

Susan and Grant Johnson 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.



All times are GMT +1. The time now is 07:43.

Contact Us - Horizons Unlimited Motorcycle Travellers Website - Archive - Privacy Statement - Top