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2001 R1100S 2 second knock/noise at start-up
- Thread starter iselin
- Start date
m_stock10506
Well-known member
...post a pic of that S at the top of Oilheads, it drives the RS guys
And justifiably so!
happy wanderer
Day Dreaming ...
The left side tensioner that came with your bike has been superceded by a new one which is identical to the part used on the R1200 engines. In the old ones the oil leaks out when the engine stops. The new one retains the oil so there is no "knocking" on startup. The sound you hear is actually the cam chain slapping since it is loose until the old tensioner fills with oil and starts pushing on the chain like it's supposed to. The original tensioner causes premature wear of the cam chain and guide. Not good!
Any BMW dealer will have this part available as well as Tom Cutter at the Rubber Chicken Racing Garage.
The left side tensioner that came with your bike has been superceded by a new one which is identical to the part used on the R1200 engines. In the old ones the oil leaks out when the engine stops. The new one retains the oil so there is no "knocking" on startup. The sound you hear is actually the cam chain slapping since it is loose until the old tensioner fills with oil and starts pushing on the chain like it's supposed to. The original tensioner causes premature wear of the cam chain and guide. Not good!
Any BMW dealer will have this part available as well as Tom Cutter at the Rubber Chicken Racing Garage.
Thanks so much for this information…I'll give it a try
Having posted the same question myself about 4 years ago, odds are 10 to 1 that this is the problem.
Don't forget to report back. And don't forget to post a picture of your S!
Jeff488
Aspiring Profligate
Here's Tom's site.
He's a good asset to our band of bikers.
http://rubberchickenracinggarage.com/chain.html
He's a good asset to our band of bikers.
http://rubberchickenracinggarage.com/chain.html
lkchris
Active member
You identify if you already have the upgraded tensioner by noting the size of the hex nut welded to the tensioner. 17 mm = the original, 15 mm = the upgraded version.
That said, I've had an upgraded version completely frozen in place, i.e. unable to adjust any tension. And, I still have the startup knocking. Have replaced right side tensioner as well. Still investigating.
That said, I've had an upgraded version completely frozen in place, i.e. unable to adjust any tension. And, I still have the startup knocking. Have replaced right side tensioner as well. Still investigating.
happy wanderer
Day Dreaming ...
Saw this happen once before on a friends 1200RT which has the same new tensioners. A very minor scoring of the inner piston was found to be the cause upon disassembly. The mechanic at Ozzies felt that this was a manufacturing defect. He figured with all the oil in there it certainly did not happen due to lack of lubrication.
gsaddict
Pepperfool
New style tensioner
If it is frozen in place (not compressing) it has been used before and is full of oil.
You must depress the little ball inside and pump the oil out before re-installing.
If it is frozen in place (not compressing) it has been used before and is full of oil.
You must depress the little ball inside and pump the oil out before re-installing.
The tensioner has been replaced
The newer model tensioner was put in and it took care of the noise at start-up… just like you guys said it would
Thanks so much for the good information!
The newer model tensioner was put in and it took care of the noise at start-up… just like you guys said it would
Thanks so much for the good information!
The newer model tensioner was put in and it took care of the noise at start-up… just like you guys said it would
Once in a while we make a lucky guess.
Glad we could help!
