ADVrider

Go Back   ADVrider > Bikes > Old's Cool > Airheads
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 10-07-2012, 04:56 AM   #1
R100LT OP
Chasing 11
 
R100LT's Avatar
 
Joined: Jan 2012
Location: Donnybrook Western Australia
Oddometer: 626
Look what I found

Whilst dropping the oil and checking the sump a found a small pile of chewed up rubber ... Apart from that the oil was clean and not a hint of any metal.

Any ideas of where I should be looking for the culprit ???

__________________
BMW R100LT 93 BMW R100RS 91 BMW K1100LT SE 94 76 R90S
R100LT is offline   Reply With Quote
Old 10-07-2012, 05:00 AM   #2
Uncle Pollo
happy cachiporra
 
Uncle Pollo's Avatar
 
Joined: Jun 2006
Location: Albuquerque, Neue Messico
Oddometer: 47,473
Pushrod seal or old sealant.
Uncle Pollo is offline   Reply With Quote
Old 10-07-2012, 07:04 AM   #3
Bill Harris
Confirmed Curmudgeon
 
Bill Harris's Avatar
 
Joined: Sep 2008
Location: backwoods Alabama
Oddometer: 7,269
If it's hard rubber, it may be from the timing chain tensioner rail.
__________________
'73 R60/5 Toaster
Luddite. Not just a philosophy, a way of life...
Bill Harris is offline   Reply With Quote
Old 10-07-2012, 07:06 AM   #4
R100LT OP
Chasing 11
 
R100LT's Avatar
 
Joined: Jan 2012
Location: Donnybrook Western Australia
Oddometer: 626
Thanks Bill ... Yep its pretty hard rubber ... but I haven't noticed any noise from the timing chain
__________________
BMW R100LT 93 BMW R100RS 91 BMW K1100LT SE 94 76 R90S
R100LT is offline   Reply With Quote
Old 10-07-2012, 08:36 AM   #5
disston
ShadeTreeExpert
 
disston's Avatar
 
Joined: Mar 2011
Location: Silver Spring, Md
Oddometer: 8,951
Most likely timing chain tensioner.
__________________
.
Never memorize something you can look up.
---Albert Einstein

Pay your debt, piratejohn.http://www.advrider.com/forums/showthread.php?t=949341
disston is online now   Reply With Quote
Old 10-07-2012, 08:46 AM   #6
R100LT OP
Chasing 11
 
R100LT's Avatar
 
Joined: Jan 2012
Location: Donnybrook Western Australia
Oddometer: 626
so you are thinking thats its just a bit off the end of the timing chain tensioner ??? You thinking its worth digging and replacing it if I am not getting any undue noise from the timing chain ???
__________________
BMW R100LT 93 BMW R100RS 91 BMW K1100LT SE 94 76 R90S
R100LT is offline   Reply With Quote
Old 10-07-2012, 08:59 AM   #7
Wolfgang55
Beastly Adventurer
 
Wolfgang55's Avatar
 
Joined: Dec 2006
Location: Next to Rio Bravo
Oddometer: 3,372
It just maybe......German chewing gum.

TASTE IT
Wolfgang55 is offline   Reply With Quote
Old 10-07-2012, 09:47 AM   #8
DoktorT
BigBrowedNeandereer
 
DoktorT's Avatar
 
Joined: Apr 2009
Location: Chewelah, WA
Oddometer: 1,143
Just way too big a chunk to ignore. More chunks will follow. Other chunks could be floating around in the chain case. Plan to pull the timing cover this winter, inspect the chain and gears, replace the tensioner rail/s and perhaps the spring.

Don't wait for nasty noises. That would likely mean much more cost than fixing this obvious flaw BEFORE any nasty noises get started.
DoktorT is offline   Reply With Quote
Old 10-07-2012, 10:35 AM   #9
disston
ShadeTreeExpert
 
disston's Avatar
 
Joined: Mar 2011
Location: Silver Spring, Md
Oddometer: 8,951
How many miles on this engine?
__________________
.
Never memorize something you can look up.
---Albert Einstein

Pay your debt, piratejohn.http://www.advrider.com/forums/showthread.php?t=949341
disston is online now   Reply With Quote
Old 10-07-2012, 12:14 PM   #10
H96669
A proud pragmatist.
 
H96669's Avatar
 
Joined: Nov 2009
Location: Hiding off Hwy 6, B.C.
Oddometer: 4,494
I found similar chunks in the GS. Was the guide rail for the camchain, the one opposite the tensioner.

In itself not all that critical, that is if the pieces had stayed in the sump. Because it is a GS, looks like the PO dropped it on the left hand side. Some of the little pieces got in between the piston/cylinder. Wanna see the damages?
__________________
Have tools, will travel!
H96669 is online now   Reply With Quote
Old 10-07-2012, 12:36 PM   #11
Bill Harris
Confirmed Curmudgeon
 
Bill Harris's Avatar
 
Joined: Sep 2008
Location: backwoods Alabama
Oddometer: 7,269
It's probably either the tensioner or the guide rail, and suggests some mileage. The guide rail keep the chain quiet once it wears-- on the earlier duplex chain engines, the worn chain would announce itself by rattling against the timing chain cover and create noise and aluminium shavings. It isn't going to get better.

No big hurry, but don't forget about it...
__________________
'73 R60/5 Toaster
Luddite. Not just a philosophy, a way of life...
Bill Harris is offline   Reply With Quote
Old 10-07-2012, 12:39 PM   #12
Beater
Mighty Unclean
 
Beater's Avatar
 
Joined: Sep 2009
Location: Atlanta, GA, USA
Oddometer: 3,158
Quote:
Originally Posted by DoktorT View Post
Just way too big a chunk to ignore. More chunks will follow. Other chunks could be floating around in the chain case. Plan to pull the timing cover this winter, inspect the chain and gears, replace the tensioner rail/s and perhaps the spring.

Don't wait for nasty noises. That would likely mean much more cost than fixing this obvious flaw BEFORE any nasty noises get started.

PS - He's in Western Australia ... It's getting to be spring for him ;-)

Take the timing chain cover off NOW.
__________________
Fred
'85 R80RT G/Sified <|> '91 R100GS Bumblebee (103K miles and climbing) <|> '73 R75/5 LWB
Airhead Zen: Ride - Repair - Ride - Maintain - Ride - Repeat
Beater is offline   Reply With Quote
Old 10-07-2012, 03:02 PM   #13
R100LT OP
Chasing 11
 
R100LT's Avatar
 
Joined: Jan 2012
Location: Donnybrook Western Australia
Oddometer: 626
The bike has done 65 000 km's ... so I guess its getting about time for a new timing chain .

I just didn't want to " upset " my good work of the Enduralast system that I put in last year .

Oh well ... Timing Chain Kit is the shopping cart as we speak.
__________________
BMW R100LT 93 BMW R100RS 91 BMW K1100LT SE 94 76 R90S
R100LT is offline   Reply With Quote
Old 10-07-2012, 03:11 PM   #14
disston
ShadeTreeExpert
 
disston's Avatar
 
Joined: Mar 2011
Location: Silver Spring, Md
Oddometer: 8,951
I have always thought that the duplex chain is inherently better than the single row chain. After all it's twice as much chain. But the single row chains seem to be an improvement. I don't know why. Could be the tensioner system is better?

I would still do yours because of this symptom you have developed. But 65,000 KM seems an early failure.
__________________
.
Never memorize something you can look up.
---Albert Einstein

Pay your debt, piratejohn.http://www.advrider.com/forums/showthread.php?t=949341
disston is online now   Reply With Quote
Old 10-07-2012, 03:23 PM   #15
100RT
Studly Adventurer
 
100RT's Avatar
 
Joined: Nov 2009
Location: N. E. OHIO
Oddometer: 621
I hope the pick up screen wasnt laying there also.
100RT is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

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 On

Forum Jump


Times are GMT -7.   It's 09:00 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014