Need help - leaking exhaust? - BMW Luxury Touring Community
 
LinkBack Thread Tools Display Modes
post #1 of 18 Old Jul 12th, 2008, 9:35 am Thread Starter
Member
 
JGroves's Avatar
 
Join Date: May 2003
Location: Huntington, WV, USA
Posts: 89
Question Need help - leaking exhaust?

My '99 LT (65k miles) suddenly sounds like a Diesel. I also hear a distinct buzzing tune that plays along with the engine up until 3-4k rpm or so.

Info from the site points to a leaking exhaust, but I cannot find the leak visually. It does not appear to be coming from the weld behind the passenger footpeg. There doesn't SEEM to be any soot around any of the head flanges, but it's hard to tell. I can look at them with the bike running, and nothing is obvious. No loose headers. I don't notice any change in performance, just the increase in engine noise and the buzz.

I'll be able to pull the plastic for a better look later in the week, but is there anything else that might cause this? I recently changed the oil. No leaks or drips. And should I park the bike? I have a 300 mile trip ahead of me and I would much prefer to ride.

Thanks!
JGroves is offline  
Sponsored Links
Advertisement
 
post #2 of 18 Old Jul 12th, 2008, 10:31 am
Senior Member
 
Hollywood's Avatar
 
Join Date: Dec 2007
Location: Saint Cloud, Florida, USA
Posts: 280
Re: Need help - leaking exhaust?

Quote:
Originally Posted by JGroves
My '99 LT (65k miles) suddenly sounds like a Diesel. I also hear a distinct buzzing tune that plays along with the engine up until 3-4k rpm or so.

Info from the site points to a leaking exhaust, but I cannot find the leak visually. It does not appear to be coming from the weld behind the passenger footpeg. There doesn't SEEM to be any soot around any of the head flanges, but it's hard to tell. I can look at them with the bike running, and nothing is obvious. No loose headers. I don't notice any change in performance, just the increase in engine noise and the buzz.

I'll be able to pull the plastic for a better look later in the week, but is there anything else that might cause this? I recently changed the oil. No leaks or drips. And should I park the bike? I have a 300 mile trip ahead of me and I would much prefer to ride.

Thanks!
While working in the dealerships, we would use a soapy water mix and spray around the exhaust to check for leaks.
Also works for intake leaks too, the idle will drop when sprayed around the intake.

2003 Black
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
K1200LTC


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Garmin 450
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
XM Radio
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Video Camera Mount
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Fender Mount Driving Lights
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Autocom Super Pro AVi
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Saddlebag LED Lights

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Bakup Backrest
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Grip Puppies
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
VStream Windscreen
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Muth Mirrors
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
2008 Bushtec
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Hollywood is offline  
post #3 of 18 Old Jul 12th, 2008, 10:35 am Thread Starter
Member
 
JGroves's Avatar
 
Join Date: May 2003
Location: Huntington, WV, USA
Posts: 89
Re: Need help - leaking exhaust?

Quote:
Originally Posted by Hollywood
While working in the dealerships, we would use a soapy water mix and spray around the exhaust to check for leaks.
Also works for intake leaks too, the idle will drop when sprayed around the intake.
I'll try that. I was expecting a crack or loose connection to be obvious. It sounds like that may not be the case...

Thanks for the idea!
JGroves is offline  
 
post #4 of 18 Old Jul 12th, 2008, 4:44 pm
Senior Member
 
Ridesalot's Avatar
 
Join Date: Jun 2004
Location: Westfield, IN, USA
Posts: 164
Re: Need help - leaking exhaust?

Exhaust gaskets are leaking.....

I just changed mine at 47k on a 2005
was making a buzzing whisilling noise
around 3500 - 4000 +

pull the bottom plastic only on exhaust side
look for black exhaust blow by around the pipes

that is the exhaust gasket that is leaking

no worries order all 4 of the gaskets
and a new stud or 2
and all of the nuts

Ridesalot

2005 LT "The grey one with the bugs on it."
Ridesalot is offline  
post #5 of 18 Old Jul 12th, 2008, 10:08 pm Thread Starter
Member
 
JGroves's Avatar
 
Join Date: May 2003
Location: Huntington, WV, USA
Posts: 89
Re: Need help - leaking exhaust?

I hope they don't take as long to get as the brake line I bought in April...

Thanks for the tips.

Jeff
JGroves is offline  
post #6 of 18 Old Jul 13th, 2008, 9:12 am
Senior Member
 
Ridesalot's Avatar
 
Join Date: Jun 2004
Location: Westfield, IN, USA
Posts: 164
Re: Need help - leaking exhaust?

# 2 gasket almost gone in one place on mine

so i replaced them all.....

i looked and found no maintenance interval on
exhaust gaskets
not even "check tightness on this fastener at 000000 miles".

replaced all 4 gaskets 2 studs and all the nuts...

re torquing without gaskets at that point was pointless

If JGroves gaskets are compromised ( and they are makeing a whisling or buzzing noise) re torquing his would be pointless also......... IMHO

Ridesalot

2005 LT "The grey one with the bugs on it."
Ridesalot is offline  
post #7 of 18 Old Jul 13th, 2008, 10:49 am
Senior Member
 
dshealey's Avatar
 
Join Date: Apr 2002
Location: Dandridge (Near Knoxville), TN, USA
Posts: 12,165
Re: Need help - leaking exhaust?

Loosen all the exhaust nuts on the headers so that the exhaust can drop down just a little, then try to turn all the flanges. If one or more turn any at all, the welds inside them where the pipe is welded is broken. This has happened on several, mine one of them.

If broken, easily re-welded.

I don't want to achieve immortality through my work...I want to achieve it through not dying.

David Shealey
Dandridge, TN
EX: '01 Black LT, BAT BYKE (Totaled at 110,000 miles)
IBA SS, BB, BBG, 10/10ths.
No bike now, but maybe in the future.
dshealey is offline  
post #8 of 18 Old Jul 14th, 2008, 2:59 pm Thread Starter
Member
 
JGroves's Avatar
 
Join Date: May 2003
Location: Huntington, WV, USA
Posts: 89
Re: Need help - leaking exhaust?

Ok, so I went to the fiche to get the part #'s for the exhaust gaskets and studs/nuts. I couldn't find part #'s for the studs. I searched for "exhaust stud" on this site and found all the threads I wish I had found when searching for "exhaust leak". So anyway, thanks to those with advice and sorry for what has turned out to be a repeat of another recent thread.

But...

What is the part # for the studs? O-ring and nuts show up on exhaust system fiche. I can't find the studs there or in the "engine" section. And of course I could call the dealership for this info, but I know someone else knows and is dying to tell...

Thanks again,
Jeff
JGroves is offline  
post #9 of 18 Old Jul 14th, 2008, 3:18 pm
Lifetime Supporter
 
DanMartin's Avatar
 
Join Date: Jun 2002
Location: Fulshear, TX, USA
Posts: 2,082
Re: Need help - leaking exhaust?

probably 07129908137

see #9 on Cylinder head fiche

Dan
DanMartin is offline  
post #10 of 18 Old Jul 14th, 2008, 4:26 pm
Senior Member
 
DanDiver's Avatar
 
Join Date: Jun 2003
Location: Tampa, FL, USA
Posts: 4,829
Re: Need help - leaking exhaust?

When replacing the O ring gaskets (I'm assuming you are talking about the copper crush ones) put a little grease on them before trying to balance all four at one time. Keeps them from falling off. I spent quite a bit of time learning this....

Dano
Tampa, Fl.

12 K1600 GTL
02 K1200 LT (gone but not forgotten)
DanDiver is offline  
post #11 of 18 Old Jul 14th, 2008, 5:48 pm
Member
 
Join Date: Dec 2006
Location: Aurora, MO, USA
Posts: 57
Timely Thread

I could use some advise while we are on the subject.

I have a 99lt that sounds like the bottom end is falling out of it when you crack the throttle hard from a idle. If I roll on the throttle it is smooth and quiet through the entire rpm range. Only happens when you nail it. It sounds low, tinny and in front of the peg area. Almost like a lose baffle or rattling skid plate. I have tried to bumb-hit everything I could get to with the tupperware on, but can not find any rattles. I am thinking exhaust flanges, but would like to know what you guys think? It only has 33,000 miles and runs fine. I may be putting it up for sale and need to get this fixed.

Any sugguestions?

Thanks
Pat
Patdcop is offline  
post #12 of 18 Old Jul 14th, 2008, 8:13 pm
Senior Member
 
grifscoots's Avatar
 
Join Date: May 2002
Location: Outside New Braunfels , TX, USA
Posts: 13,451
Re: Timely Thread

Quote:
Originally Posted by Patdcop
I could use some advise while we are on the subject.

I have a 99lt that sounds like the bottom end is falling out of it when you crack the throttle hard from a idle. If I roll on the throttle it is smooth and quiet through the entire rpm range. Only happens when you nail it. It sounds low, tinny and in front of the peg area. Almost like a lose baffle or rattling skid plate. I have tried to bumb-hit everything I could get to with the tupperware on, but can not find any rattles. I am thinking exhaust flanges, but would like to know what you guys think? It only has 33,000 miles and runs fine. I may be putting it up for sale and need to get this fixed.

Any sugguestions?

Thanks
Pat
I'd start where the large tupperware panels meet the silver bottom ones in the front. If there's nothing there, cut some soft side of velcro to size (strips) and slap it on.



100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

-=grif=-
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Grok
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
grifscoots is offline  
post #13 of 18 Old Jul 15th, 2008, 6:14 pm
Senior Member
 
dshealey's Avatar
 
Join Date: Apr 2002
Location: Dandridge (Near Knoxville), TN, USA
Posts: 12,165
Re: Timely Thread

Quote:
Originally Posted by Patdcop
I could use some advise while we are on the subject.

I have a 99lt that sounds like the bottom end is falling out of it when you crack the throttle hard from a idle. If I roll on the throttle it is smooth and quiet through the entire rpm range. Only happens when you nail it. It sounds low, tinny and in front of the peg area. Almost like a lose baffle or rattling skid plate. I have tried to bumb-hit everything I could get to with the tupperware on, but can not find any rattles. I am thinking exhaust flanges, but would like to know what you guys think? It only has 33,000 miles and runs fine. I may be putting it up for sale and need to get this fixed.

Any sugguestions?

Thanks
Pat
That is very similar to what I had for 3-4 months before I discovered the welds inside the header flanges broken. Try my earlier test: Loosen all the header nuts until the header is slightly loose in the head and try to rotate all the flanges. If broken, whey will rotate around the pipe as far as the studs allow.

I don't want to achieve immortality through my work...I want to achieve it through not dying.

David Shealey
Dandridge, TN
EX: '01 Black LT, BAT BYKE (Totaled at 110,000 miles)
IBA SS, BB, BBG, 10/10ths.
No bike now, but maybe in the future.
dshealey is offline  
post #14 of 18 Old Jul 15th, 2008, 6:35 pm
Senior Member
 
Steve_R's Avatar
 
Join Date: Mar 2003
Location: Snellville, GA, USA
Posts: 6,424
Re: Need help - leaking exhaust?

Quote:
Originally Posted by dandiver
When replacing the O ring gaskets (I'm assuming you are talking about the copper crush ones) put a little grease on them before trying to balance all four at one time. Keeps them from falling off. I spent quite a bit of time learning this....
I heard that's a sympton from lack of oxygen, i.e. jumping out of airplanes comes to mind.

On His Ride,
Steve
-
KA5MTE
'02 LTE - Red-blooded Dragonfly
'00 Unigo - Dragon's Egg
'01 LTC - Flying Purple People Eater (Ya gotta be old enough to understand)(RIP)
'00 LTC - Canyon Red Rover (RIP)

Have you
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
bmwlt.com lately????



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


"To not know me is to lose nothing, to not know Him is to lose everything."
Steve_R is offline  
post #15 of 18 Old Jul 15th, 2008, 8:23 pm
Senior Member
 
DanDiver's Avatar
 
Join Date: Jun 2003
Location: Tampa, FL, USA
Posts: 4,829
Re: Need help - leaking exhaust?

Not quite as crowded up there as it is on the highways........

Dano
Tampa, Fl.

12 K1600 GTL
02 K1200 LT (gone but not forgotten)
DanDiver is offline  
post #16 of 18 Old Jul 15th, 2008, 9:06 pm
Member
 
Join Date: Dec 2006
Location: Aurora, MO, USA
Posts: 57
Re: Need help - leaking exhaust?

Thanks David, I will try that this weekend. Griff, the plastics tight as I have put 3m HB tape along the seem. I just hate laying on my back paying homage to the girl. The things they do for attention.
Patdcop is offline  
post #17 of 18 Old Jul 24th, 2008, 8:04 pm Thread Starter
Member
 
JGroves's Avatar
 
Join Date: May 2003
Location: Huntington, WV, USA
Posts: 89
Re: Need help - leaking exhaust?

Gaskets came in today, so I thought I'd remove the exhaust and see if I could diagnose the problem.

Everything came apart nicely. Seven of the eight studs came out of the head, but threads all look nice. Fine. Removed exhaust and heat shield to inspect. Hmm. The exhaust was very clean. I could find no trace of soot anywhere. All welds looked good. Flanges were all tight with no signs of soot. So I figure maybe one of the gaskets was leaking (though there were no signs of rupture or broken seal area on the old gaskets).

I cleaned everything up and reassembled, new copper gaskets, torqued exhaust-to-C.H. studs to 22 Nm per manual. No change. Still sounds like a diesel, still has a tinny buzz until around 4k rpm.

Could the leak just be that hard to find? Does this sound like it could be anything else?

My next step is to let everything cool off, soak it all with soapy water, turn the engine over and hope for bubbles.

Also... I ordered some spare studs and nuts (just in case). The nuts they sent are much smaller than the originals (not the ID, just overall length). Did I order the wrong part or is this just the replacement? They are copper, like the originals.

Thanks again for the advice!

Last edited by JGroves; Jul 24th, 2008 at 8:24 pm.
JGroves is offline  
post #18 of 18 Old Jul 25th, 2008, 4:12 pm
Junior Member
 
Join Date: Jan 2008
Location: Soroe, , Denmark
Posts: 7
Re: Need help - leaking exhaust?

Try to look for a broken exhustline at cylinder nr. 4. It can be a problem on the older models
chicco96 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the BMW Luxury Touring Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Exhaust systems question. Dick K1200LT 9 Apr 15th, 2008 8:48 am
'07 R1200RT exhaust upgrade switz RT Series 3 Mar 11th, 2008 6:34 pm
Best place to buy Remus exhaust ... Petre K1200LT 8 Sep 20th, 2006 11:54 pm

Posting Rules  
You may post new threads
You may 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

 
For the best viewing experience please update your browser to Google Chrome