R1200gs adventure 2011 DOHC "Advice Needed" rear oil leak

[Markyboy]

I have, on another post, asked for advice to do with servicing and general work on my bike as someone who is definitely now great with the tools.

I have given the bike a full service and have had a few issues with rounded sumps, final drive bolts which have all been removed and replaced.

With that in mind when I did the service on the final drive the filler bolt was completely rounded so after seeing The Old Mechanic on Youtube have the same issue he filled the final drive by removing the ABS sensor. On my bike you could see scratches where someone had removed the ABS sensor with a screwdriver or similar over the years (rather than getting the rounded bolt out).... Anyway I filled it the same way via the ABS sensor and used a new aluminium crush washer bought from Motorworks in its replacement. I have taken the bike out tonight for its first, post service, run and there's oil all over the rear wheel, disk and pads (in that area) and when I removed the rear wheel to look its definitely leaking from the ABS sensor.

I've googled it and one answer was that its a rubber washer needed instead of the aluminium washer? Can anyone confirm either way please or advise what I'm doing wrong?

Thanks Mark

 

[RoyF]

Hi Marky, looking at the RealOEM page, looks like it shows the sensor (they call it a speed sensor) with what they call a 'centering ring' part number 33117707796 on first then an 'O-ring' part number 34527708523. They're only a couple of quid. If you don't have access to Real OEM, just put the part number in google and MSP (Motorcycle Spare Parts) will ping up and they have an exploded diagram on their page !!

Regards,

Roy

 

[Markyboy]

Hi Marky, looking at the RealOEM page, looks like it shows the sensor (they call it a speed sensor) with what they call a 'centering ring' part number 33117707796 on first then an 'O-ring' part number 34527708523. They're only a couple of quid. If you don't have access to Real OEM, just put the part number in google and MSP (Motorcycle Spare Parts) will ping up and they have an exploded diagram on their page !!

Regards,

Roy

Thank you Roy.... much appreciated Ill look into that. Cheers mark

 

[Gee-]

This might help. Same as RoyF mentions in post #2

Parts highlighted in RED.as below.

 

[seahorse]

The centering ring is really just a washer, and as per above diagram it goes after the o ring. They often get lost or are missing and it will definitely leak with only the o ring in place. It is definitely not an ali crush washer.

 

[Gee-]

This website helps as with other parts "fiche" for your bike. Change bike model and year to suit.

MAX BMW Motorcycles - BMW Parts & Technical Diagrams - R1200GS ADV 08 (K255)

BMW Parts for your R1200GS ADV 08 (K255) Production: 11/06-09/09 USA

shop.maxbmw.com

Go to the ukGSer "Quick links" for extra help also.

 

[Markyboy]

Thank you guys..... much appreciated. Last question tonight. I put new pads in the rear and now they are covered in diff oil, will they need to be replaced with a new set or can they be cleaned with brake cleaner? Or similar

 

[JonnyBravo]

If the o ring and washer is present, it should be a nice tight snug fit and the retaining screw doesn’t really do much.
Mine is a bit of a bugger to pop/pull out!
Should not leak oil.
Is the o ring actually still there ?

I would clean the pads and disc up, roughen the pads a bit and reuse.

 

[siddo]

Thank you guys..... much appreciated. Last question tonight. I put new pads in the rear and now they are covered in diff oil, will they need to be replaced with a new set or can they be cleaned with brake cleaner? Or similar

Definitely new pads.

 

[Steptoe]

The genuine BMW O ring is green.

 

[Markyboy]

Ok guys I f#'ked up. Now Steptoe mentioned the O ring is Green I realise where I have gone wrong. I found a green O ring in the garage but didn't know where it came from and was thrown off the case when I spoke to Motorworks about the ABS speed sensor and they supplied me with the "centering ring" (which I thought was a crush washer) but didn't mention the O ring (I'm not blaming them) so when the Centering ring turned up, along with all the other stuff, I thought that was all that was needed. So the oil is pissing out because its got no O ring in it.

Live and learn - I've ordered the new bits now

Thank you all again

 

[Gee-]

Live and learn

I think you may find that most of us have made bad judgements, not errors, when it comes to repairs or servicing our own vehicles. Like you say, Live and learn, other quote, If in doubt, ask!.

Well done so far.

 

[Slipperyeel]

The centering ring is really just a washer, and as per above diagram it goes after the o ring. They often get lost or are missing and it will definitely leak with only the o ring in place. It is definitely not an ali crush washer.

From an assembly perspective, I always understood that 'centering ring' was fitted first, then the O-ring? So in effect, the O-ring is faced with metal on both inner and outer faces.

 

[seahorse]

You may be right, I don't remember from when I have done it (numerous) times before. The fiche suggests otherwise however. The sensor itself is plastic.

 

[Pukmeister]

If you liberally douse the contaminated pads with brake cleaner they might come clean enough to re-use, but I’d replace them if I were you. I’ve heard tales of soaking brake pads and clutches in Coca Cola overnight then rinsing off, but never tried it myself.

As stated above, the slim metal ring goes on the sensor followed by the green viton rubber O ring.

 

[RoyF]

You may be right, I don't remember from when I have done it (numerous) times before. The fiche suggests otherwise however. The sensor itself is plastic.

All depends from which was you look at it.

With the sensor in your hand, the centering ring goes on the sensor first, then the O-ring and the sensor complete is then fitted into the housing.
If you look at the housing, the O-ring will be first, then the centering ring, then the sensor.

Roy.

 

[seahorse]

All depends from which was you look at it.

With the sensor in your hand, the centering ring goes on the sensor first, then the O-ring and the sensor complete is then fitted into the housing.
If you look at the housing, the O-ring will be first, then the centering ring, then the sensor.

Roy.

That was what I was saying to begin with yes .

 

[Slipperyeel]

All depends from which was you look at it.

With the sensor in your hand, the centering ring goes on the sensor first, then the O-ring and the sensor complete is then fitted into the housing.
If you look at the housing, the O-ring will be first, then the centering ring, then the sensor.

Roy.

I think it's more a case of how it's described
The end situation should be as mention above - the O-ring sandwiched by metal faces inside and outside.
In practice, you'll find a way - pinching the O-ring is quite easy though, so keep your eyes peeled.
I think I've tried O-ring into the FD housing, centering ring onto the sensor and also everything on the sensor. The former is where I've settled at.
Putting both into the housing followed by the sensor I've found v tricky.

I've only replaced the sensor 3 times in as many years But I also check the UJ and shaft once a year, so had a little experience with this job. Sometimes it falls in. Others it's a real fiddle!