BMWSportTouring BMWST DB
Page 1 of 3 1 2 3 >
Topic Options
#996706 - 09/12/17 04:16 PM Engine smokes at startup - Valve stem seals?
Lone_RT_rider Offline
Member

Registered: 07/22/00
Posts: 5893
Loc: Germantown, WI
So, my 1999 R1100RT with 105K miles has always been a bit smokey, but lately it's progressively getting worse. I won't even start up the bike in the garage unless the tailpipe is pointed in the right direction. My first instinct is the valve stem seals. I have changed those in old american V-8 engines before (pressurize cylinder, press down valve spring with correct valve spring tool, pull keepers, , remove spring and replace seal. Then reverse removal process for installation). Is the process basically the same?

I have not done a compression check, but she runs damned strong. Also, I am not leaving it on the side stand, it gets left on the center stand most all times, even at work.

Any ideas?

And no, I don't want to start an oil thread. laugh

Shawn

Top
#996707 - 09/12/17 04:30 PM Re: Engine smokes at startup - Valve stem seals? [Re: Lone_RT_rider]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 13014
Loc: Ohio
Originally Posted By: Lone_RT_rider
So, my 1999 R1100RT with 105K miles has always been a bit smokey, but lately it's progressively getting worse. I won't even start up the bike in the garage unless the tailpipe is pointed in the right direction. My first instinct is the valve stem seals. I have changed those in old american V-8 engines before (pressurize cylinder, press down valve spring with correct valve spring tool, pull keepers, , remove spring and replace seal. Then reverse removal process for installation). Is the process basically the same?

I have not done a compression check, but she runs damned strong. Also, I am not leaving it on the side stand, it gets left on the center stand most all times, even at work.

Any ideas?

And no, I don't want to start an oil thread. laugh



Afternoon Shawn

On the old high mile BMW boxers it is usually the rings that cause start-up oil burning.

You can still have good compression but weak oil control rings.

Valve seal replacement is as you wrote above.

Try parking bike on the center stand to see if start-up oil smoke gets better.
_________________________
D.R. ___
Sent from my rotory dial wall phone!

Top
#996710 - 09/12/17 04:58 PM Re: Engine smokes at startup - Valve stem seals? [Re: dirtrider]
Lone_RT_rider Offline
Member

Registered: 07/22/00
Posts: 5893
Loc: Germantown, WI
Originally Posted By: dirtrider
Try parking bike on the center stand to see if start-up oil smoke gets better.


Thanks for the quick reply. I only park the bike on the center stand, so I am probably seeing the best it can get at this point. Replacing rings is not something I have time for currently, so that will go low on the project list. I will just keep adding oil. smile

Shawn

Top
#996713 - 09/12/17 05:37 PM Re: Engine smokes at startup - Valve stem seals? [Re: dirtrider]
Michaelr11 Offline
Member

Registered: 09/25/03
Posts: 734
Loc: Trinity, NC
Before you park on the center stand, while still sitting on the bike, lean the bike over to the right. Put the bike on the side stand, then put it up on the center stand.
_________________________
Michael Stock, Trinity NC
01 R1100RT, R60/6, R100

Top
#996720 - 09/12/17 07:07 PM Re: Engine smokes at startup - Valve stem seals? [Re: dirtrider]
tvpierce Offline
Member

Registered: 04/29/08
Posts: 282
Loc: Maine
Originally Posted By: dirtrider
Originally Posted By: Lone_RT_rider
So, my 1999 R1100RT with 105K miles has always been a bit smokey, but lately it's progressively getting worse. I won't even start up the bike in the garage unless the tailpipe is pointed in the right direction. My first instinct is the valve stem seals. I have changed those in old american V-8 engines before (pressurize cylinder, press down valve spring with correct valve spring tool, pull keepers, , remove spring and replace seal. Then reverse removal process for installation). Is the process basically the same?

I have not done a compression check, but she runs damned strong. Also, I am not leaving it on the side stand, it gets left on the center stand most all times, even at work.

Any ideas?

And no, I don't want to start an oil thread. laugh



Afternoon Shawn

On the old high mile BMW boxers it is usually the rings that cause start-up oil burning.

You can still have good compression but weak oil control rings.

Valve seal replacement is as you wrote above.

Try parking bike on the center stand to see if start-up oil smoke gets better.



Is the problem generally that the oil control rings are worn, or gunked-up with deposits?
_________________________
Jeff Pierce

'96 R1100RT
'79 Honda CX500



"The problem with quotes on the internet is that it's darn near impossible to verify their authenticity." Abraham Lincoln

Top
#996722 - 09/12/17 08:20 PM Re: Engine smokes at startup - Valve stem seals? [Re: Lone_RT_rider]
tallman Offline
Picture Perfect Humorist
Member

Registered: 12/22/02
Posts: 19614
Loc: Tallahassee, Florida
Any other symptoms?
If not...oil cheap.
_________________________
If my mind wanders, should I follow it?
Tim
Conch Town Krewe
2003 K 1200 GT
1996 R 100 RSL
1980 R 100 RT
1972 R 75
1968 R 50
All now gone...


Top
#996728 - 09/12/17 09:16 PM Re: Engine smokes at startup - Valve stem seals? [Re: tallman]
Lone_RT_rider Offline
Member

Registered: 07/22/00
Posts: 5893
Loc: Germantown, WI
Originally Posted By: tallman
Any other symptoms?
If not...oil cheap.


Just that all that oil will probably take out the catalytic converter over a while. Other than that, she just keeps plugging along. smile

Shawn

Top
#996729 - 09/12/17 09:30 PM Re: Engine smokes at startup - Valve stem seals? [Re: Lone_RT_rider]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 13014
Loc: Ohio
Originally Posted By: Lone_RT_rider
Originally Posted By: tallman
Any other symptoms?
If not...oil cheap.


Just that all that oil will probably take out the catalytic converter over a while. Other than that, she just keeps plugging along. smile

Shawn


At 105k your cat is probably already DOA.
_________________________
D.R. ___
Sent from my rotory dial wall phone!

Top
#996733 - 09/12/17 11:17 PM Re: Engine smokes at startup - Valve stem seals? [Re: tvpierce]
Michaelr11 Offline
Member

Registered: 09/25/03
Posts: 734
Loc: Trinity, NC
A tank full of gas treated with Techron couldn't hurt.
_________________________
Michael Stock, Trinity NC
01 R1100RT, R60/6, R100

Top
#996764 - 09/13/17 01:30 PM Re: Engine smokes at startup - Valve stem seals? [Re: dirtrider]
tallman Offline
Picture Perfect Humorist
Member

Registered: 12/22/02
Posts: 19614
Loc: Tallahassee, Florida
Originally Posted By: dirtrider
Originally Posted By: Lone_RT_rider
Originally Posted By: tallman
Any other symptoms?
If not...oil cheap.


Just that all that oil will probably take out the catalytic converter over a while. Other than that, she just keeps plugging along. smile

Shawn


At 105k your cat is probably already DOA.


lurk
_________________________
If my mind wanders, should I follow it?
Tim
Conch Town Krewe
2003 K 1200 GT
1996 R 100 RSL
1980 R 100 RT
1972 R 75
1968 R 50
All now gone...


Top
#996818 - 09/13/17 11:03 PM Re: Engine smokes at startup - Valve stem seals? [Re: Lone_RT_rider]
eddd Offline
Member
Member

Registered: 12/04/06
Posts: 5810
Loc: Hurricane, UT

Just pretend you are still a young dude riding your old two stroke.
lurk
_________________________
12 Kawasaki EX650
13 Yamaha XT250
16 KTM RC 390
96 R1100RT - forced retirement at 175,000


Top
#997031 - 09/16/17 12:40 AM Re: Engine smokes at startup - Valve stem seals? [Re: Lone_RT_rider]
Lester V Offline
Member

Registered: 01/31/01
Posts: 288
Loc: Grand Forks, BC Canada
Originally Posted By: Lone_RT_rider
So, my 1999 R1100RT with 105K miles has always been a bit smokey, but lately it's progressively getting worse. I won't even start up the bike in the garage unless the tailpipe is pointed in the right direction. My first instinct is the valve stem seals. I have changed those in old american V-8 engines before (pressurize cylinder, press down valve spring with correct valve spring tool, pull keepers, , remove spring and replace seal. Then reverse removal process for installation). Is the process basically the same?

I have not done a compression check, but she runs damned strong. Also, I am not leaving it on the side stand, it gets left on the center stand most all times, even at work.

Any ideas?

And no, I don't want to start an oil thread. laugh

Shawn


My .02 Canuck. Have we all considered how the oil was checked? You know, the old oil dance check thread that is on here somewhere?
in short, if the warm oil bike wasn't put on the side stand for 5 minutes and then put on the center stand, then the oil level could read low and the owner would add too much to bring it up in the site glass. = high oil level and oil burning off out the tail pipe.

Top
#997034 - 09/16/17 01:15 AM Re: Engine smokes at startup - Valve stem seals? [Re: Lone_RT_rider]
Eckhard Grohe Offline
Member

Registered: 07/19/00
Posts: 1240
Loc: Chateauguay, Quebec, Canada
What about oil in the plenum/airbox???
_________________________
Eckhard Grohe
Chateauguay, Canada
98 R1100RT, Boston Green
R100RS Last Edition
R100RT 60th Anniversary Edition???
egrohe@sympatico.ca

Top
#997180 - 09/18/17 11:31 AM Re: Engine smokes at startup - Valve stem seals? [Re: Lone_RT_rider]
OoPEZoO Offline
Member

Registered: 07/24/05
Posts: 5855
Loc: Amish Country, PA
Shawn.....my RT did the same thing after the mileage crept up there. It was worse when I parked at work because I had to put it on the side stand (sloped parking lot). It used to fire a good puff of smoke on startup every afternoon. Less so in the mornings after being on the center stand overnight, but still a little. Mine used to puff smoke when riding hard as well, and that is almost always attributed to the rings starting to wear out. Compression and leak down tests were always within spec when I checked it.

I thought about looking into it further, but figured it wasn't worth the headache for the small amount of oil I was losing. When I parked it for good at about 135K miles, it was still barely burning any oil between changes. I think it only takes a few drops to get that mosquito cloud on start up
_________________________
-Keith (Yup, thats me...and my rubber chicken)

Making the world a better place, one rubber chicken at a time!

'98 Buell S1 Lightning
'06 R1200GS
'86 Honda CB125
'00 R1100RT (parting out, PM me)

Top
#997184 - 09/18/17 12:18 PM Re: Engine smokes at startup - Valve stem seals? [Re: Lone_RT_rider]
Mike279 Offline
Member

Registered: 05/04/16
Posts: 50
Loc: Syracuse NY
My 04 RT is using a bit of oil too but not much visible smoke. I just changed the valve seals and tried the tool with the magnet in it. You whack the tool and it catches the keepers on the magnet inside. That part worked great. Since the engine is sideways, installation with the other side of the tool is a no go. I used the five zip tie and water pump pliers method to compress the springs. The engine has 48K on it and the valve stems have a bit of play and the valve faces some marking. They still seal well but the combustion chamber shows too much carbon buildup. I have only run a few hundred miles with the new seals so I can't tell if I am using less oil yet. I will probably run the motor like this until the valves start leaking or some other issue requires a tear down. The bike runs very well on 93 octane fuel with very little knock( using the AFXied O2 sensor manipulator). Mike

Top
#997187 - 09/18/17 12:28 PM Re: Engine smokes at startup - Valve stem seals? [Re: Lone_RT_rider]
David R Online
Member

Registered: 09/04/09
Posts: 742
Loc: Western NY
I had a 2000 1100 RT with 136,000 miles. I rebuilt the engine, It was not a good idea.

First I found the piston rings were all lined up on the top of the piston both sides.

End gap was just out of spec.

Compression test showed above spec because carbon build up.



Cylinder looked good, still had hone marks, probably never broken in.

I took the heads with new BMW guides to a machine shop. They did the valve job, charged me $500 and said it did not need the guides.
Rod bearings were not worn at all. This is the firs time I saw cracked (broken) rod caps.





Crankshaft play was .004", right at the limit.




I think the bike was lugged for the first 100,000 miles before I bought it. It always had oil changes at 3,000 miles from new.

Pistons and bore were still in spec. It was burning the "window" (16 oz)full of oil in 800 miles.

I bought a Kawasaki Versys 650 to ride while the RT was down.

After the rebuild, the clutch splines were really worn. Almost ready to strip.



Hard to photograph, but just paper thin left.



Ended up buying a NEW 2012 R1200R camhead. Once I had the new R, the RT and Versys just sat around. Should have used the money I put into the engine on the new bike.

David

Pics are photobucket and will disappear later this year.


Edited by David R (09/18/17 12:56 PM)
_________________________
'76 R75/6 67,000 miles
2000 R1100RT 137,000 miles. (retired)
11 Versys 11,000 miles
12 R1200R!

Top
#997190 - 09/18/17 12:50 PM Re: Engine smokes at startup - Valve stem seals? [Re: Lone_RT_rider]
David R Online
Member

Registered: 09/04/09
Posts: 742
Loc: Western NY
Maybe it does not belong here, but these are the splines at 100,000 miles when I bought the bike.

Just shows a heavy hand on the throttle was part of the wear problem.

_________________________
'76 R75/6 67,000 miles
2000 R1100RT 137,000 miles. (retired)
11 Versys 11,000 miles
12 R1200R!

Top
#997196 - 09/18/17 01:42 PM Re: Engine smokes at startup - Valve stem seals? [Re: David R]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 13014
Loc: Ohio
Originally Posted By: David R
Maybe it does not belong here, but these are the splines at 100,000 miles when I bought the bike.

Just shows a heavy hand on the throttle was part of the wear problem.



Morning David

Or possibly just repositioning the clutch disk on the trans input splines in a different clocking position at first check.

Once the splines wear into a specific match-up in the clocking position, if that match up is changed, then the resulting spline mismatch can greatly accelerate the future spline wear until the contact wear evens out to become full contact again. (even one spline tooth position off is as bad as 180 degrees off).
_________________________
D.R. ___
Sent from my rotory dial wall phone!

Top
#997206 - 09/18/17 03:10 PM Re: Engine smokes at startup - Valve stem seals? [Re: David R]
OoPEZoO Offline
Member

Registered: 07/24/05
Posts: 5855
Loc: Amish Country, PA
Thanks for the posts David.

My theory of what finally did in my RT is very similar to where I think you were heading with the crank shaft runout. My clutch wore out at 100k miles. I went to replace it and found heavy spline wear. I chose to rebuild the transmission with a new main shaft thinking that the original lasted 100K miles, so will the replacement. 35k miles later that new transmission shaft stripped out. My theory is that the crank shaft bearings were getting sloppy, which accelerated the wear on the transmission splines. No proof of course, just a theory. I still have the motor sitting in the back of the garage, but at this point I'm not sure I care enough to put a dial indicator on it to properly check.

Sorry Shawn....didn't mean to hijack grin
_________________________
-Keith (Yup, thats me...and my rubber chicken)

Making the world a better place, one rubber chicken at a time!

'98 Buell S1 Lightning
'06 R1200GS
'86 Honda CB125
'00 R1100RT (parting out, PM me)

Top
#997216 - 09/18/17 05:08 PM Re: Engine smokes at startup - Valve stem seals? [Re: OoPEZoO]
Lone_RT_rider Offline
Member

Registered: 07/22/00
Posts: 5893
Loc: Germantown, WI
Originally Posted By: OoPEZoO
Sorry Shawn....didn't mean to hijack grin


It's all good man. smile You know I enjoy all things mechanical. Now if you would have tried to hijack this thread talking about software code..... we'd be feud'n. rofl dopeslap stir shake

Shawn

Top
#997374 - 09/20/17 11:51 AM Re: Engine smokes at startup - Valve stem seals? [Re: Lone_RT_rider]
OoPEZoO Offline
Member

Registered: 07/24/05
Posts: 5855
Loc: Amish Country, PA
So.....whatcha gonna do? Going to investigate further or leave it alone? lurk
_________________________
-Keith (Yup, thats me...and my rubber chicken)

Making the world a better place, one rubber chicken at a time!

'98 Buell S1 Lightning
'06 R1200GS
'86 Honda CB125
'00 R1100RT (parting out, PM me)

Top
#997380 - 09/20/17 12:29 PM Re: Engine smokes at startup - Valve stem seals? [Re: OoPEZoO]
Lone_RT_rider Offline
Member

Registered: 07/22/00
Posts: 5893
Loc: Germantown, WI
Originally Posted By: OoPEZoO
So.....whatcha gonna do? Going to investigate further or leave it alone? lurk


If it would have most likely been the valve seals, I would have done that. But since everyone seems so convinced that it's the oil rings and that my engine will probably self destruct in 37.6 seconds after I re-assemble the thing, I am probably just going to keep starting it outside the garage and adding oil. smile

They will have to sell that bike after I'm dead anyway. Let the next person deal with it. lol

Shawn

Top
#997383 - 09/20/17 12:45 PM Re: Engine smokes at startup - Valve stem seals? [Re: Lone_RT_rider]
mrzoom Online
Member

Registered: 08/06/02
Posts: 880
Loc: Tulsa, OK
Remember STP ????? 2 cans ought to do it. rofl
_________________________
MrZoom
05 RT "Smokey"
The rest are history
If everything is under control your not going fast enough!!!

Top
#997478 - 09/21/17 03:30 PM Re: Engine smokes at startup - Valve stem seals? [Re: mrzoom]
Lone_RT_rider Offline
Member

Registered: 07/22/00
Posts: 5893
Loc: Germantown, WI
Originally Posted By: mrzoom
Remember STP ????? 2 cans ought to do it. rofl


Yeah, and maybe some motor honey while I'm at it. LMAO

Top
Page 1 of 3 1 2 3 >