Post by: Supershooter on March 22, 2020, 03:52:33 PM
Supershooter
Post by: Laitch on March 22, 2020, 04:12:37 PM
Post by: Martin on March 22, 2020, 04:57:37 PM
Regards Martin.
Post by: Supershooter on March 22, 2020, 05:19:03 PM
Thanks again.
Supershooter
Post by: Supershooter on March 22, 2020, 05:45:32 PM
Supershooter
Post by: The Mighty Gryphon on March 22, 2020, 06:25:58 PM
You could try taking it to an automotive machine shop to see if they can get the broken bolt out. I wonder if someone used red LocTite on it and it needs to be heated.
Otherwise, you can look for a used part. That gear was used in the K100, K75 and the K1200, but not the K1100.
Post by: Laitch on March 22, 2020, 07:43:27 PM
As Gryph indicated, a search for a replacement shaft or pump might turn up something suitable.
Post by: The Mighty Gryphon on March 22, 2020, 08:00:59 PM
There is no indication in the fiche as to the thread direction. Judging from the price($39.48), that is a very special bolt. Possibly with a left hand thread?
12311460853_1_N.jpg (1.13 kB . 97x75 - viewed 626 times)Maybe someone who has been into the pump can chime in, why is there a self locking nut going over the head of a bolt?
Post by: Laitch on March 22, 2020, 08:09:13 PM
Laitch, Looking at the fiche, it looks like a bolt that goes into a threaded hole in the end of the shaft.I've looked at the fiche. I believe early models had a threaded shaft then the assembly was revised with the tapped shaft. What I see in his photo is a nut with some threads on its inner circumference and a chunk of metal within it. Supershooter is likely to answer my question and set me straight.
Post by: Laitch on March 23, 2020, 12:11:13 AM
Maybe someone who has been into the pump can chime in, why is there a self locking nut going over the head of a bolt?I don't think there is. Maybe this thread will clarify things (http://www.motobrick.com/index.php/topic,5283.msg32708.html#msg32708).
Post by: volador on March 23, 2020, 06:36:50 AM
pre-1986-87? original design pump 11411461177 with 'threaded stud end' of pump geared shaft and SELF-LOCKING HEX NUT-M8-8-ZNS 07129964675 superseded by 07129904002 securing the cast impeller/rotor 11511460024
Superseded by pump 11412325850 design changed to 'tapped' geared shaft 11411461183 with Z=32 teeth gear with Z=14 teeth drive shaft
changed to stamped impeller/rotor 11411461173 secured to 'tapped' geared shaft with 12311460853 SCREW-M8X22 (bolt)
Superseded by pump 11417676366 same tapped geared shaft 11411461183 with Z=32 teeth gear with Z=14 teeth drive shaft
latest pump 11517676371 design change tapped geared shaft 11411461793 to Z=19 teeth gear with drive shaft Z=12 teeth 11411460282 DRIVE SHAFT renew O-ring
SB 1100102_Slip-ring seal for water pump (http://www.motobrick.com/index.php/topic,4994.msg31004.html#msg31004)
Sealing Combination Coolant/Oil Pump SB 11 046 91 2458 (http://www.motobrick.com/index.php/topic,13176.0.html)
Rebuilding pump 'press in bushing tool' 11 6 724 - PRESS IN BUSHING 83300401628 PRESS-IN BUSHING NLA
OIL & WATER PUMP PRESS TOOL/ENDURALAST/EME (https://www.euromotoelectrics.com/product-p/pumpkittool628.htm)
Post by: The Mighty Gryphon on March 23, 2020, 09:07:21 AM
$39 and change for a friggin' screw that can only be used once!
Geez, that's as bad as that clutch boot that's as fragile as a butterfly wing. I'd love to know what makes that screw so special and why it can't be reused.
Post by: volador on March 23, 2020, 09:47:23 AM
Geez, that's as bad as that clutch boot that's as fragile as a butterfly wing. I'd love to know what makes that screw so special and why it can't be reused.
Do you reuse your 6-clutch pack bolts? Probably no reason not to reuse that one. Motorrad just "recommends"...
'In oil pump applications, this is is a one time use only bolt. BMW recommends replacing this when rebuilding any "old" style but serviceable K bike pump'.
12 31 1 460 853 $32.50 EME (https://www.euromotoelectrics.com/product-p/pumpbolt853.html)
(http://www.motobrick.com/gallery/2/5332-230320102949-2883752.jpeg)
(http://www.motobrick.com/gallery/2/5332-230320102956-28911538.jpeg)
Post by: The Mighty Gryphon on March 23, 2020, 11:44:09 AM
Post by: Supershooter on March 23, 2020, 08:43:13 PM
I was shopping for parts online and started to wonder if a local machine shop could cut off the treaded end of the shaft and tap the shaft to accept a bolt. Am I wasting my time with this thought process?
Dustin
Post by: volador on March 23, 2020, 11:35:25 PM
If you know the proper length of the coolant side of the shaft your proposition follows the OE progression of water/oil pump design change as is mentioned above.
Proper coolant side shaft protruding will ensure the seal is not disturbed.
Post by: Laitch on March 24, 2020, 12:39:14 AM
What symptom moved you to disassemble the pump? Were you looking for the source of the oil at the intermediate housing?
Post by: Supershooter on April 12, 2020, 06:51:04 PM
Post by: volador on April 16, 2020, 11:56:29 PM
Post by: Supershooter on May 17, 2020, 07:41:15 PM
Supershooter
Post by: The Mighty Gryphon on May 17, 2020, 09:06:46 PM
Post by: Supershooter on May 17, 2020, 09:55:17 PM
Ummm...you broke the OEM bolt, and now you want to replace it with a cheap one.
No, the shaft that holds the impeller on was threaded with a nut on the end. Now I need to buy a new gear /shaft that is is tapped to receive the bolt on impeller.
Supershooter
Post by: The Mighty Gryphon on May 17, 2020, 09:58:00 PM
Post by: Laitch on May 17, 2020, 11:02:55 PM
I've decided to order a new impeller, is there a cheap place to buy the bolt that holds it in?What you're seeking is a serrated flange head 8mmx22 1.25 bolt. Googling that will bring some much less costly options. One difference separating the BMW bolt from others is that swell just under the flange indicated by the arrow in the photo. That might be a design feature that increases security of attachment. Another question that might arise is whether those serrations on the bolt flange are really necessary. That's the fun part of being a pioneer; you'll find out yourself, indisputably.
Post by: Supershooter on May 18, 2020, 12:16:10 PM
I was hoping another pioneer had already experimented and shared his results...
Supershooter
Post by: Laitch on May 18, 2020, 12:44:18 PM
I was hoping another pioneer had already experimented and shared his results...I searched and nothing turned up. It's all on you. icon_cheers
Post by: Supershooter on May 19, 2020, 10:34:42 PM
I searched and nothing turned up. It's all on you. icon_cheers
😆👍
I'm gonna trust your work, give in, and buy the $39 bolt, I do appreciate your work, it's saving me some time I can spend wrenching or with kids teaching them to ride!
Supershooter