O2 sensor & exhaust gaskets - K-Bikes.com - Excellence in Motion
 
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post #1 of 4 (permalink) Old Nov 21st, 2006, 9:56 pm Thread Starter
 
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O2 sensor & exhaust gaskets

Since I took my exhaust off I thought I would replace my O2 sensor while I had the chance, seems to be real hard to get off, any ideas? 7/8ths wrench seems about right. Also it looks like I had no copper exhaust gaskets, but I see some copper color up in there, can they get crushed down flat, maybe I should try to root around in there and see if they really are there, just super compressed? Cheers, Jack
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post #2 of 4 (permalink) Old Nov 22nd, 2006, 3:58 am
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Your bike is '97 like mine. The sensor was a real pig to remove with my muffler in situ. I had to remove the shift linkage to get more space. My wrench struggled and I eventually heated the thing with a torch and used a 3ft Stillson pipe wrench, but moving it carefully a few mm in both directions as the sensor came out. This is important because the sensor thread is longer than the bush it fits into and the lower part of the thread gets very corroded. Your muffle is off, so the task may be a lot easier, but you'll have to find a way to hold the muffler in a strong vise, without damaging it.

The new sensor didn't just 'drop in' and I felt it was going to cross thread. Then I found a sensor 'thread chaser' (a large tap) in my local auto shop. This was very important to clean up the threaded bush. I smeared a very light film of copper grease on the new sensor thread. PTFE tape should be ok, but don't use anything silicon.

On all other bikes I've worked on, gaskets used on headers can get crushed and stick inside. Yes you have 4 of them:

http://www.realoem.com/bmw/showparts...92&hg=18&fg=05



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post #3 of 4 (permalink) Old Nov 22nd, 2006, 11:52 am Thread Starter
 
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O2 sensor pricey $130

Just ordered an O2 sensor from Chi BMW, price just went up from 80 to 130 bucks, jesus.
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post #4 of 4 (permalink) Old Nov 23rd, 2006, 2:31 am
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You're lucky.

In UK they wanted about $200 so I bought a Bosch Universal for $90 and spliced the leads to the BMW lead and connector. It seems you are paying for the privilege of having a lead and connector specified only for the BMW KRS that isn't made for anything else. When you try to go direct to Bosch for the oem, they quote lower prices but 6 months delivery on 'special order'. I thought something stank so I voted with my cash for the Universal and share it for anybody else that's interested.



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