How Do You Know If A Crank Bearing Is Bad? - Snowmobile World : Your #1 Snowmobile Forum
http://www.snowmobileworld.com/forums
» Sponsors
Go Back   Snowmobile World : Your #1 Snowmobile Forum > SNOWMOBILING SECTION > SKI-DOO

Reply
 
Thread Tools
Old 02-13-2006, 07:57 PM   #1
spinner
Senior Member
 
Join Date: Nov 2003
Where I sled: ny
Posts: 219
Default

i have a vibration/humming sound i can't pinpoint. sled start first pull, compression is high and runs good. how would i know if it is a crank bearing? maybe a driveshaft bearing? any help would be great!!! i am thinking of riding the sled like this a couple times, but don't want to if it may be the crankshaft bearing...... :bash:
spinner is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-13-2006, 08:40 PM   #2
Thumbdoctor
Senior Member
 
Thumbdoctor's Avatar
 
Join Date: Feb 2003
Location: Saint Lazare, QC.
Primary Sled: 2005 MXz Adrenalin 800HO
Where I sled: Northern Ontario
Posts: 2,782
Default

Does the humming sound change pitch with engine RPM ?
Does the humming sound change pitch with sled speed ?
Does the humming sound change pitch when decellerating ?
Does the humming sound change pitch with temperature ?
Does the humming sound change pitch with snow conditions ?
These are some things you need to note when you are riding. For example:

A crank bearing on the PTO side will squeal amd allow the primary clutch to rattle. Its sound will change with increased RPM.

A jackshaft bearing will only make noise under way and increase with speed.

Temperature & snow conditions will affect ice build up in the tunnel and cause rubbing.

Try getting all the conditions dow on paper before taking things apart.
__________________
Located in Western Quebec

Kilos traveled this season 2750
Thumbdoctor is offline   Reply With Quote
Old 02-13-2006, 10:20 PM   #3
paul yarek
Senior Member
 
paul yarek's Avatar
 
Join Date: Mar 2001
Location: L7 C2 oakland twp 44 King St N RR 4 Scotland N0E 1R0, southwest of brantford, southern ontario
Mileage: 2487 miles
Primary Sled: 2007 blizzard 600
Where I sled: southern ontario and wisconsin.
Posts: 11,657
Default

idle the sled and spray ether towards the crankshaft bearing, if the idle remains then the seal is fine and usually the bearing also. if the sled's idle becomes greater then you have at the least a seal gone.
__________________
IF WE GIVE ALL THE PROFIT TO THE IMPORTS WHAT WILL BE LEFT?
paul yarek is offline   Reply With Quote
Old 02-14-2006, 08:15 AM   #4
idooski
Administrator_X
 
idooski's Avatar
 
Join Date: Mar 2001
Location: SW Michigan!!
Mileage: 710
Primary Sled: 2005 MXZ REV 800 'XXX'
Where I sled: Where ever it takes me
Posts: 5,120
Send a message via ICQ to idooski Send a message via Yahoo to idooski
Default

Quote:
idle the sled and spray ether towards the crankshaft bearing, if the idle remains then the seal is fine and usually the bearing also. if the sled's idle becomes greater then you have at the least a seal gone.
[/b]
Good suggestion Paul, but I'd like to suggest the use of WD-40 instead. It's safer and will tell the same story as ether.
idooski is offline   Reply With Quote
Old 02-14-2006, 09:38 PM   #5
paul yarek
Senior Member
 
paul yarek's Avatar
 
Join Date: Mar 2001
Location: L7 C2 oakland twp 44 King St N RR 4 Scotland N0E 1R0, southwest of brantford, southern ontario
Mileage: 2487 miles
Primary Sled: 2007 blizzard 600
Where I sled: southern ontario and wisconsin.
Posts: 11,657
Default

Quote:
Good suggestion Paul, but I'd like to suggest the use of WD-40 instead. It's safer and will tell the same story as ether.
[/b]
i don't like my WD40 bottle in the winter, like something else around here it don't squirt that good.

probably from lack of use.
__________________
IF WE GIVE ALL THE PROFIT TO THE IMPORTS WHAT WILL BE LEFT?
paul yarek is offline   Reply With Quote
Old 02-14-2006, 09:51 PM   #6
idooski
Administrator_X
 
idooski's Avatar
 
Join Date: Mar 2001
Location: SW Michigan!!
Mileage: 710
Primary Sled: 2005 MXZ REV 800 'XXX'
Where I sled: Where ever it takes me
Posts: 5,120
Send a message via ICQ to idooski Send a message via Yahoo to idooski
Default

Paul, you are just a bad boy! w00t
idooski is offline   Reply With Quote
Old 02-15-2006, 05:30 AM   #7
spinner
Senior Member
 
Join Date: Nov 2003
Where I sled: ny
Posts: 219
Default

Does the humming sound change pitch with engine RPM ?
Does the humming sound change pitch with sled speed ?
Does the humming sound change pitch when decellerating ?
Does the humming sound change pitch with temperature ?
Does the humming sound change pitch with snow conditions ?
yes to all these,
i am leaning towards a jack shaft bearing... thanks for all the tips, i will check the crank bearings/seals as sugested. if it is a jackshaft bearing, what kind of damage will riding a 100 miles or so cause? winter is almost done here and i jsut don't have the time to tear into it for 1 more ride, i was hoping to jsut ride it and fix it in the spring......
spinner is offline   Reply With Quote
Old 02-15-2006, 10:16 AM   #8
98Mach_Z
Junior Member
 
Join Date: Jan 2006
Posts: 12
Default

Quote:
Does the humming sound change pitch with engine RPM ?
Does the humming sound change pitch with sled speed ?
Does the humming sound change pitch when decellerating ?
Does the humming sound change pitch with temperature ?
Does the humming sound change pitch with snow conditions ?
yes to all these,
i am leaning towards a jack shaft bearing... thanks for all the tips, i will check the crank bearings/seals as sugested. if it is a jackshaft bearing, what kind of damage will riding a 100 miles or so cause? winter is almost done here and i jsut don't have the time to tear into it for 1 more ride, i was hoping to jsut ride it and fix it in the spring......
[/b]
Hi spinner,

Does your sled smoke irregularly when idling?

Thanks
98Mach_Z is offline   Reply With Quote
Old 02-16-2006, 04:18 AM   #9
spinner
Senior Member
 
Join Date: Nov 2003
Where I sled: ny
Posts: 219
Default

yea, it seemed to be smoking more than usual. why????
spinner is offline   Reply With Quote
Old 02-16-2006, 08:08 AM   #10
mr670
Senior Member
 
mr670's Avatar
 
Join Date: Mar 2001
Location: Bradford, Ontario(lake Simcoe)
Primary Sled: 1997 MXZ 670
Where I sled: Lake simcoe & Muskoka
Posts: 1,106
Default

Wd-40 has changed the propellent, it is no longer flamable.
__________________
MXZer
mr670 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools

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

Forum Jump

Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 03:37 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.