Go Back   LS1TECH > LS1-LS2-LS3-LS6-LS7 PERFORMANCE > Generation III Internal Engine
Sign in using an external account
Register Forgot Password?
Search

Generation III Internal Engine
1997-2006 LS1 | LS6
Sponsored by
Texas Speed & Performance

Welcome to LS1Tech.com!
Welcome to LS1Tech.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join LS1Tech.com today!


Reply
 
Thread Tools Search this Thread
Old 05-13-2013, 11:21 AM   #1
Launching!
1969 Chevrolet Camaro
 
69MyWay's Avatar
 
Trader Rating: 2
Join Date: Sep 2004
Location: Central Illinois
Posts: 286
Default oil leak from the back of the crankshaft?

Anybody with an automatic trans set up ever seen oil leaking around what appears to be a casting (looks like a freeze plug you would see in a head) plug that is in the back of the crankshaft?

I had oil puddled in this spot when I pulled the trans/torque converter back (the snout of the converter slides up into the back of the crank opening) - and I have oil spray strewn out from the center all over the flexplate.
69MyWay is offline   Reply With Quote
Old 05-13-2013, 01:31 PM   #2
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 0
Join Date: Mar 2013
Posts: 731
Default

Yep there is a small plug in the back of the crank closing the hole in the center. Yours is either loose or damaged in some way. Would have been nice if gm would have done something a little more durable for that hole. It doesn't take much to mess with it.
RockinWs6 is offline   Reply With Quote
Old 05-13-2013, 02:07 PM   #3
Launching!
1969 Chevrolet Camaro
 
69MyWay's Avatar
 
Trader Rating: 2
Join Date: Sep 2004
Location: Central Illinois
Posts: 286
Default

Quote:
Originally Posted by RockinWs6 View Post
Yep there is a small plug in the back of the crank closing the hole in the center. Yours is either loose or damaged in some way. Would have been nice if gm would have done something a little more durable for that hole. It doesn't take much to mess with it.
Okay - so at least I'm not crazy here in what I see going on.

I wonder if I should try to knock it out and replace it or just clean it well and put some sealant around it?????
69MyWay is offline   Reply With Quote
Old 05-13-2013, 04:37 PM   #4
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 0
Join Date: Mar 2013
Posts: 731
Default

Well if you hit on it, it is going to drop into the oil pan. So don't do that. I'm not sure what to suggest. I guess you could carefully clean it and see why its leaking. Maybe put a bead of silicone around the edge of it?

Best fix would be to know it out and replace it but like I said if you push on it, it will drop into the oil pan.
RockinWs6 is offline   Reply With Quote
Old 05-13-2013, 04:46 PM   #5
TECH Apprentice
Garage is empty, add now
 
Trader Rating: 2
Join Date: May 2004
Posts: 311
Default

Quote:
Originally Posted by RockinWs6 View Post
Well if you hit on it, it is going to drop into the oil pan. So don't do that. I'm not sure what to suggest. I guess you could carefully clean it and see why its leaking. Maybe put a bead of silicone around the edge of it?

Best fix would be to know it out and replace it but like I said if you push on it, it will drop into the oil pan.
Is this plug only used on the LS-1? Reason I ask, prior to purchasing my 02 TransAm, they replaced the rear oil seal. Now, a few months later I have yet another oil leak at the back of the engine. I checked a used 5.3 that I have and a factory fresh 2002 6.0 and neither have the plug.
george88gta is offline   Reply With Quote
Old 05-13-2013, 05:14 PM   #6
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 0
Join Date: Mar 2013
Posts: 731
Default

I'm not sure but anything that uses a gun drilled crank will need the plug.

Probably only going to find it on GMs high performance engines. Not the truck stuff..
RockinWs6 is offline   Reply With Quote
Old 05-13-2013, 05:41 PM   #7
TECH Apprentice
Garage is empty, add now
 
Trader Rating: 2
Join Date: May 2004
Posts: 311
Default

Quote:
Originally Posted by RockinWs6 View Post
I'm not sure but anything that uses a gun drilled crank will need the plug.

Probably only going to find it on GMs high performance engines. Not the truck stuff..
Did some research and the truck engines are not drilled and do not have this plug. Question, did GM change the drilled crank design or do all ls1's have the drilled crank? All I have found so far is that this drilled crank started in 1997, no end date.
george88gta is offline   Reply With Quote
Old 05-13-2013, 05:57 PM   #8
Launching!
1969 Chevrolet Camaro
 
69MyWay's Avatar
 
Trader Rating: 2
Join Date: Sep 2004
Location: Central Illinois
Posts: 286
Default

I have the engine out and the pan off. If I could find the correct plug I'd replace it.

I imagine the oil coming through the crank can and is pushing out there
69MyWay is offline   Reply With Quote
Old 05-13-2013, 06:14 PM   #9
TECH Apprentice
Garage is empty, add now
 
Trader Rating: 2
Join Date: May 2004
Posts: 311
Default

Quote:
Originally Posted by 69MyWay View Post
I have the engine out and the pan off. If I could find the correct plug I'd replace it.

I imagine the oil coming through the crank can and is pushing out there
I believe the correct GM part number is 24502262. gmpartsdirect or your local GM dealer or Ebay..
george88gta is offline   Reply With Quote
Old 05-13-2013, 09:26 PM   #10
TECH Enthusiast
Garage is empty, add now
 
Trader Rating: 0
Join Date: Mar 2013
Posts: 731
Default

I believe ALL LS series have the high performance gun drilled crank.
RockinWs6 is offline   Reply With Quote
Old 05-14-2013, 11:53 AM   #11
Launching!
1969 Chevrolet Camaro
 
69MyWay's Avatar
 
Trader Rating: 2
Join Date: Sep 2004
Location: Central Illinois
Posts: 286
Default

I called the local engine rebuilder too and he told me something interesting. The AERA (automotive engine rebuilder association) has a TSB out - 2267 in think) that addresses the "high performance LS series of GM engines that may develop an oil leak in this area. Often mistaked for a failed rear main seal.

The plug is 27.79 mm and must be installed 1.228-1.240 in the rear.

Also the rear cover is known to have porosity leading to leaks that can be sealed with RTV or replaced.
69MyWay is offline   Reply With Quote
Old 05-14-2013, 11:53 AM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply

Tags
24502262, crank, crankshaft, crankshafts, gm, inages, leak, ls, ls1, ls1tech, oil, part, plug, rear, repeat, silicone


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Oil leak from the bellhousing - diagnosing and tips? jclayc Cadillac CTS-V 5 10-15-2013 09:06 PM
4L60E electrical plug-in leaking on top of panÖ. Ksths2 Automatic Transmission 7 09-08-2013 08:15 PM
BAD Oil Leak lilpb1 Generation III External Engine 20 05-12-2013 01:02 PM
oil leak Atwiss Chevrolet Camaro 1967-2002 0 05-08-2013 06:09 PM
Another oil leak thread (sigh) driver56 Carbureted LSX Forum 0 10-11-2012 11:39 PM



All times are GMT -5. The time now is 05:29 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - JOBS
Emails & Contact Details