Oil fill O-ring

[craydds]

My oil fill cap is weeping a little oil. Stock BMW o-rings are $4.21 apiece, part number 07-11-9-904-950: https://shop.maxbmw.com/fiche/DiagramsMain.aspx?vid=60124&rnd=09082020 .

At $6.81 for 25 o-rings (27 cents apiece) I am going to try these from McMaster Carr: https://www.mcmaster.com/products/o...t~metric/width~3-530mm/width~3-500mm/od~32mm/ . Had to pay shipping plus tax, total came to $17.15, but that is only 68 cents per o-ring. I specifically chose 3.5 mm thick (diameter) o-rings, maybe get a better seal. Will report on results.

 

[Omega Man]

Have you tried the local hardware store? Midwest Fastener selection.
I like McMaster Carr but sometimes the quantities don’t work for me.

OM

 

[craydds]

Have you tried the local hardware store? Midwest Fastener selection.
I like McMaster Carr but sometimes the quantities don’t work for me.

OM

Omega Man, I did not try local. Sometimes they do not have specifically required items. Often it is easier for me to go with McMaster, and I can get exactly what I want. Yes, I usually get a lifetime supply. Ha! Now I will have a lifetime supply of o-rings. Anybody need one?

p.s. Recently ordered a box of M5 "clip-on" nuts; box actually had a BMW part number! https://www.mcmaster.com/catalog/129/3613/95210A350

 

[lee]

If you buy your oil filters and washers from Beemer Boneyard, the oil fill o-ring is included in the 4 pack of oil drain plug washers.
4 washers and 1 o-ring for $2.50.
https://www.beemerboneyard.com/r12lcengcrush.html

$47.95 for a 4 pack of oil filters.
$43.16 after the 10% MOA discount plus shipping.
https://www.beemerboneyard.com/114277217794pk.html

 

[Omega Man]

I posted this in another thread-



And even with round and square edge, sometimes I need something else-

OM

 

[52184]

Take your old o-ring to a good hydraulic jobber/repair shop. They can usually match sizes in a variety of materials.

Best,
DeVern

 

[craydds]

If you buy your oil filters and washers from Beemer Boneyard...
https://www.beemerboneyard.com/114277217794pk.html

Lee, I have ordered from Boneyard. Now I have a lifetime supply of final drive gear oil. Good company .

 

[craydds]

Take your old o-ring to a good hydraulic jobber/repair shop...

DeVern, we have some good local shops. It's so much easier to lay on the couch with my laptop and place an order. Don't have to run around town in traffic.

 

[craydds]

I posted this in another thread-

View attachment 92013

And even with round and square edge, sometimes I need something else-

OM

OM, next time I need an o-ring I will call YOU!

 

[52184]

DeVern, we have some good local shops. It's so much easier to lay on the couch with my laptop and place an order. Don't have to run around town in traffic.

Well, that’s my usual technique, too! But I end up giving away a lot of o-rings as bikes come through my garage, especially on Tech Days. And I like to visit my local hydraulic jobber every now and then, if for no other reason than ogling his assortment of cutaway examples.

Best,
DeVern

 

[rangerreece]

Remember to use your MOA 10% discount when buying BMW parts.

 

[craydds]

pics

stock size on left is 27 x 3.2 according to Max BMW; that's 27 mm i.d. x 3.2 mm thick o-ring. McMaster on right is 25 x 3.5 and visibly "fatter":



package of 25 o-rings at 68 cents apiece:

 

[craydds]

good seal so far

thicker o-rings drop right into place:



looks good so far, and I've tried to run the bike hard and get it plenty hot. will continue to monitor:



packaging:

 

[Omega Man]

Nice figuring on the size.

OM

 

[gordonb]

One thing I learned the hard way, My o-ring was weeping a bit on a trip so I snugged it up a bit. After 350 miles still weeping. Stopped at ACE and put a ring on the top part of the filler cap (until I got home). Turns out if you overtighen the cap the ring will leak. Who'd of thought. Never leaked again.

 

[Omega Man]

One thing I learned the hard way, My o-ring was weeping a bit on a trip so I snugged it up a bit. After 350 miles still weeping. Stopped at ACE and put a ring on the top part of the filler cap (until I got home). Turns out if you overtighen the cap the ring will leak. Who'd of thought. Never leaked again.

I actually think that is an excellent consideration.

OM

 

[langoptc]

One thing I learned the hard way, My o-ring was weeping a bit on a trip so I snugged it up a bit. After 350 miles still weeping. Stopped at ACE and put a ring on the top part of the filler cap (until I got home). Turns out if you overtighen the cap the ring will leak. Who'd of thought. Never leaked again.

Great info!

 

[inspektor224]

Metric vs Inch o-rings

stock size on left is 27 x 3.2 according to Max BMW; that's 27 mm i.d. x 3.2 mm thick o-ring. McMaster on right is 25 x 3.5 and visibly "fatter":

View attachment 92071

package of 25 o-rings at 68 cents apiece:

View attachment 92072

I was searching for the stock size 27mm x 3.2mm and not finding anything. So I tried converting the measurements to inches and "voilà"... 1-1/16in by 1/8in. Lots of options. (size #211)

Correction: After ordering a bag of size #211 Viton o-rings, #211 is NOT the correct size, they are too small. The 27mm must refer to the ID not the OD.

 

[craydds]

follow up

One thing I learned the hard way, My o-ring was weeping a bit on a trip so I snugged it up a bit. After 350 miles still weeping. Stopped at ACE and put a ring on the top part of the filler cap (until I got home). Turns out if you overtighen the cap the ring will leak. Who'd of thought. Never leaked again.

I did a little 250 mile ride yesterday - up to Cloudcroft, Ruidoso, and back. Zero oil weeping, "fatter" o-ring seems to work well. Now we shall await a long term report. How many miles/months will the o-ring maintain the seal?

 

[craydds]

I was searching for the stock size 27mm x 3.2mm and not finding anything. So I tried converting the measurements to inches and "voilà"... 1-1/16in by 1/8in. Lots of options. (size #211)

One must use only METRIC parts on a BMW.
A 1/2 inch wrench could conceivably be used instead of a 13 mm, but this would upset the balance of the entire universe.