Generation III Internal Engine 1997-2006 LS1 | LS6
Sponsored by:
Sponsored by:

What are the most common reasons for spinning a main bearing?

Thread Tools
 
Search this Thread
 
Old 03-27-2006, 07:12 PM
  #1  
Banned
Thread Starter
 
Orange2002SS's Avatar
 
Join Date: Mar 2006
Posts: 19
Likes: 0
Received 0 Likes on 0 Posts
Default What are the most common reasons for spinning a main bearing?

just like the topic says. Mine slipped. We have to take the pan off to see what happened and/or tear apart the motor. and see how bad it is but after draining the oil and looking at the filter we were able to see the gold metal sparkly stuff in the oil which is bearing.

I don't think this is common so I want to know what to look for and examine. I want to find out what caused the problem rather than just replacing the bearings and slappin her back together again..
Old 03-27-2006, 07:13 PM
  #2  
ЯєŧąяĐ Єl¡m¡иąŧøя ™
iTrader: (18)
 
orangeapeel's Avatar
 
Join Date: Nov 2004
Location: Justin, TX
Posts: 16,083
Likes: 0
Received 4 Likes on 4 Posts

Default

Spun bearings are kinda common for these motors. you don't see it alot, but it does happen. Try a search on this and you should pull up a fair amount of information on it.
Old 03-27-2006, 08:16 PM
  #3  
TECH Addict
iTrader: (22)
 
slow trap's Avatar
 
Join Date: Sep 2004
Location: tennessee
Posts: 2,639
Likes: 0
Received 0 Likes on 0 Posts

Default

i think i spun a bearing also. just done it last weekend so haven't had a chance to tear it down yet but i'll probably just bite the bullet and get a 402.
Old 03-27-2006, 08:27 PM
  #4  
TECH Junkie
iTrader: (4)
 
s346k's Avatar
 
Join Date: May 2005
Location: johnson co.
Posts: 3,433
Likes: 0
Received 1 Like on 1 Post

Default

spun bearing = lack of oil or any foreign substance/object mixing with oil..ie aluminum or antifreeze, etc..
Old 03-27-2006, 08:54 PM
  #5  
TECH Enthusiast
 
Dave Carney's Avatar
 
Join Date: Nov 2001
Location: Derby, KS
Posts: 688
Likes: 0
Received 2 Likes on 2 Posts

Default

Originally Posted by s346k
spun bearing = lack of oil or any foreign substance/object mixing with oil..ie aluminum or antifreeze, etc..
Exactly...the oil film was sheared or lost....
Old 03-27-2006, 10:25 PM
  #6  
TECH Resident
iTrader: (12)
 
kossuth's Avatar
 
Join Date: Aug 2002
Location: New Market, MD
Posts: 969
Likes: 0
Received 1 Like on 1 Post

Default

Originally Posted by Orange2002SS
just like the topic says. Mine slipped. We have to take the pan off to see what happened and/or tear apart the motor. and see how bad it is but after draining the oil and looking at the filter we were able to see the gold metal sparkly stuff in the oil which is bearing.

I don't think this is common so I want to know what to look for and examine. I want to find out what caused the problem rather than just replacing the bearings and slappin her back together again..
Main bearings aren't so common as the rod bearings are. The mains are actually pretty decent for a factory setup. Rod bearings spinning is alot more common and is usually due to eithor like somebody said oil shear or the rod bolts stretching or a combination of the two.
Old 03-27-2006, 10:39 PM
  #7  
Banned
iTrader: (92)
 
~JOSHUA's Avatar
 
Join Date: Sep 2004
Location: Atlanta
Posts: 7,757
Likes: 0
Received 0 Likes on 0 Posts
Default

My $20 bet is that you've spun the rod bearing(s). That's most likely. Lack of oil film @ high rpm.... and the list goes on. Bummer.
Old 03-27-2006, 10:46 PM
  #8  
10 Second Club
iTrader: (11)
 
BrianC98Z28's Avatar
 
Join Date: Aug 2005
Location: Texarkana,TX
Posts: 954
Likes: 0
Received 0 Likes on 0 Posts
Default

wouldnt the oil pressure drop also as soon as it goes?
Old 03-27-2006, 10:47 PM
  #9  
TECH Junkie
iTrader: (3)
 
cantdrv65's Avatar
 
Join Date: Nov 2001
Location: TEXASS
Posts: 3,202
Likes: 0
Received 0 Likes on 0 Posts

Post

Yep. These engines have a tendency to lose oil pressure at high rpms should the oil level be like 1 quart low. Another issue is weak fasteners. You have to remember the general only builds things to withstand the limits of stock RPM abuse, you can get away with a bit more prolonged RPM on the LS6...
Old 03-27-2006, 11:26 PM
  #10  
TECH Enthusiast
 
FUN LS1's Avatar
 
Join Date: Jul 2005
Location: Herndon, VA
Posts: 732
Likes: 0
Received 0 Likes on 0 Posts

Default

Not having spun a bearing before, what's it sound and feel like?
Old 03-27-2006, 11:28 PM
  #11  
ЯєŧąяĐ Єl¡m¡иąŧøя ™
iTrader: (18)
 
orangeapeel's Avatar
 
Join Date: Nov 2004
Location: Justin, TX
Posts: 16,083
Likes: 0
Received 4 Likes on 4 Posts

Default

Originally Posted by FUN LS1
Not haveing spun a bearing before, what's it sound and feel like?
horrible knocking in some cases.




All times are GMT -5. The time now is 06:33 AM.