Between exhaust manifold connection to exhaust pipe.... - Land Rover Forums - Land Rover Enthusiast Forum
 


Discovery II Talk about the Land Rover Discovery II within.

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 07-06-2012, 02:25 AM
Senior Member
Thread Starter
 
Join Date: Oct 2010
Posts: 127
Thanked 1 Time in 1 Post
Default Between exhaust manifold connection to exhaust pipe....

How would (or could) a poor seal between the exhaust manifold and the exhaust pipe impact performance, noise, milage?

How would it affect O2 sensor readings?

If a leak/poor seal did affect O2 sensor readings, would this impact fuel efficiency?

I disconnected the exhaust pipe from the exhaust manifold in order to replace my starter the other day. I found that one of the nuts, on one of the three exhaust manifold studs, wouldn't budge. The stud failed, twisted and broke with the nut siezed on it. There was enough of the stud extending past the pipe /gasket/ manifold to show that the bolt had not been fully tightened to begin with and that the pipe/gasket/manifold had probably not been sealed and probably leaked etc.

Cheers,

Thomas
Reply With Quote
  #2  
Old 07-06-2012, 05:40 AM
Banned
 
Join Date: Jul 2012
Posts: 1,533
Thanks: 0
Thanked 3 Times in 3 Posts
Default

It would affect all of the above. You need to get it out of there and replace it. It should also be throwing a service engine light code.
Reply With Quote
  #3  
Old 07-06-2012, 08:48 AM
04duxlr's Avatar
Senior Member
 
Join Date: Nov 2011
Location: Duxbury MA
Posts: 1,460
Thanked 29 Times in 24 Posts
Default

I just found 2 out of 3 nuts missing on my passenger side manifold to y pipe connection. I never threw any codes and the engine ran perfectly. I just had to replace the nuts and I was all set. In your case, you may be able to cheat and use one of those external repair clamps if you can't get the stud out. On our vehicles, this joint doesn't flex so the repair clamp should last.
Reply With Quote
  #4  
Old 07-06-2012, 08:50 AM
Disco Mike's Avatar
Administrator
 
Join Date: Apr 2006
Location: Denver, Colorado
Posts: 25,710
Thanks: 0
Thanked 41 Times in 33 Posts
Default

DITTO, that leak will cause a loss in power, MPG and be hard on the cats so don't wait around, get it fixed.
Reply With Quote
  #5  
Old 07-06-2012, 08:51 AM
antichrist's Avatar
Senior Member
 
Join Date: Sep 2007
Location: Georgia, USA
Posts: 5,236
Thanked 44 Times in 39 Posts
Default

Depending on which stud broke you can effect a temporary repair with a manifold c-clamp you can get at auto parts stores.
Reply With Quote
  #6  
Old 07-06-2012, 09:59 AM
drowssap's Avatar
Senior Member
 
Join Date: Feb 2011
Location: Boston Strong
Posts: 9,301
Thanked 305 Times in 299 Posts
Default

x2 ive had one on my jeepster for years
Reply With Quote
  #7  
Old 07-06-2012, 01:49 PM
Senior Member
Thread Starter
 
Join Date: Oct 2010
Posts: 127
Thanked 1 Time in 1 Post
Default

Thanks for the sanity check etc....

no SEL as of yet....

Ordered new gaskets, bolts, and studs last night.

I suspect I will end up having to remove the exhaust manifold and drill out the broken stud.

At first glance it looks pretty straight forward (famous last words). Is there anything that needs to be removed to get to the exhaust manifold bolts and remove the "starter side", even numbered cylinder side, exhaust manifold? (is that the "right side"?)

Can I reuse the bolts?

Should I use an anti-siezing compound on the new studs and nuts? Any recommendations?

Thanks very much...

Cheers,

Thomas
Reply With Quote
  #8  
Old 07-06-2012, 01:59 PM
Senior Member
Thread Starter
 
Join Date: Oct 2010
Posts: 127
Thanked 1 Time in 1 Post
Default

oh.... The stud that twisted off is the one closest to the engine block.

I hope I'm wrong, but I don't think the external clamp is going to work...

even if there is enough room to accomodate the clamp, I'll still have to grind off/ remove the remaining stud that extends past the downpipe flange. To do that, I'm pretty sure I'll have to remove the exhaust manifold.

I'm going to take another look to confirm... cross fingers...

Cheers,

Thomas
Reply With Quote
  #9  
Old 07-06-2012, 02:10 PM
Senior Member
 
Join Date: May 2012
Location: Shoreline, WA
Posts: 605
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I have drilled out broken studs in place but it was a definite "pain in the arm" Best bet is to replace all the studs, nothing worst than putting it back together and having one go "tink" and fall out when you tighten it.
Reply With Quote
  #10  
Old 07-06-2012, 02:16 PM
antichrist's Avatar
Senior Member
 
Join Date: Sep 2007
Location: Georgia, USA
Posts: 5,236
Thanked 44 Times in 39 Posts
Default

Well, the idea of the clamp is so you don't have to remove the manifold to use it. It doesn't have to go exactly where the stud is, assuming there's room.
Drilling out manifold studs can be a real pain to get it right. If you can't have the vehicle out of service for long I'd consider just getting a used manifold if you're removing it anyway, then work on the other one at your leisure and sell it or keep as a spare.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Exhaust manifold to Cat pipe bolt size Francopacks Discovery II 4 05-08-2014 04:19 PM
Exhaust Manifold to Y-Pipe Gasket Orientation 04duxlr Discovery II 0 07-03-2013 12:02 PM
Exhaust manifold Studs (@ Y pipe) jimpty Discovery II 3 12-04-2011 11:06 AM
Arrge... Found my Exhaust leak on the down pipe from Manifold bosshogt Discovery II 15 11-27-2011 05:00 PM
exhaust leak, rt manifold to upper pipe flange Chrisinhouston Discovery II 7 12-23-2007 11:26 AM


Tags
02, 2000, connect, connection, converter, discover, discovery, exhaust, front, gasket, land, manifold, pathfinder, pipe, rear, rover

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 Off
Refbacks are Off


Advertising
Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 11:28 PM.


LAND ROVER and its logo are the registered trademarks of Land Rover. Land Rover is not affiliated with LandRoverForums.com. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.