21MM offset spanner for ball joint nut???

Having Problems with your BMW R1200RT/R1250RT? or have some Maintenance and Service questions?
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SD1
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21MM offset spanner for ball joint nut???

Post by SD1 »

Hi. guys, I am down to the last two maintenance items on the RTP

#1. Replacing the dust boot on the telelever ball joint. I do not have a 21mm offset spanner, can someone concur/verify that this is the correct size? The part is an M14 nut that I believe translates to 21mm correct?

#2. Alt belt. I know everyone says its a huge PITA to get the alt belt on, but, honestly doesn't look that hard? I am planning to pull the main spark plugs and use a couple of sizable flat heads to coax it on. Anyone have any magic they want to share, or a link to a YouTube of someone doing it without much drama?

Cheers!

-Doug
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David.
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Re: 21MM offset spanner for ball joint nut???

Post by David. »

SD1 wrote: Wed Feb 22, 2023 12:18 am#2. Alt belt. Anyone have any magic they want to share, or a link to a YouTube of someone doing it without much drama.
Haven't done this myself but I do know someone who cut the old belt off as in this video by The Old Mechanic.
The new belt was fitted as per T.O.M. It's a Camhead GS but likely the same on a Hexhead RT.

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David.
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Re: 21MM offset spanner for ball joint nut???

Post by David. »

SD1 wrote: Wed Feb 22, 2023 12:18 am#1. Replacing the dust boot on the telelever ball joint. I do not have a 21mm offset spanner, can someone concur/verify that this is the correct size? The part is an M14 nut that I believe translates to 21mm correct.
My bike is tucked away, otherwise I'd check it for you. The best I can do is offer this photo from the MAX BMW Parts Fiche.

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Elkinell
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Re: 21MM offset spanner for ball joint nut???

Post by Elkinell »

David. wrote: Wed Feb 22, 2023 8:01 am Haven't done this myself but I do know someone who cut the old belt off as in this video by The Old Mechanic.
The new belt was fitted as per T.O.M. It's a Camhead GS but likely the same on a Hexhead RT.

What a nice old boy and an entertaining video, I bet he'd be great to have a cuppa with. Was anyone else a bit nervous about timing marks when he fitted the belt or is it just me?
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Re: 21MM offset spanner for ball joint nut???

Post by Our Gee »

No need to worry about Timing Marks. All the Belt does is drive the Alternator. One thing I would query is the Replacement Belt part number. I recently replaced my own Belt (2011 Twincam RT) and after lots of research came to the conclusion that the correct Belt is the 4 PK 592 ELAST. I think there is a picture somewhere on the Forum of my actual belt fitted. Also make sure that when fitting the Replacement the engine is only rotated in the direction shown in the Video.
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David.
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Re: 21MM offset spanner for ball joint nut???

Post by David. »

Hexheads and Camheads have the same OEM alternator belt part no. 11318528385, https://www.realoem.com/bmw/enUS/partxr ... series=K26

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