Author Topic: Transmission Mount Shims ?? (Read 17258 times)

TimTyler · « **on:** August 12, 2012, 02:54:16 PM »

I'm re-installing the transmission et al and I'm seeing enough space for a couple of washers between the two frame mounts and the transmission. I'm 99% sure there were no shims or washers there when I took it apart.

Tightening it up without washers (between the transmission and frame) obviously flexes/bends the steel frame a bit.

Should there be washers or shims in there?

Scott_ · « **Reply #1 on:** August 12, 2012, 05:48:22 PM »

Well, there are shims for that purpose, but there is also a certain spot where they are supposed to be at.
There is a procedure for bolting the frame to the engine/trans assy, and it tell where the shims should go if needed.
It's from the manual for the 1100's, so I'm not sure if it would totally apply to the k75's or not.

Motorandy123 · « **Reply #2 on:** August 16, 2012, 07:46:00 PM »

I have the 20Meg repair manual and it says to put 2 bolts in on one side and
shim something and have less than 0.25 on the other side. It is a PDF and I
don't know how to post one page and it won't let me cut and paste. I believe
you can see it here;
http://www.k100.biz/pdf/OFF/K100_K75_2V_eng.pdf

TimTyler · « **Reply #3 on:** August 16, 2012, 08:02:13 PM »

Thanks, Randy.

Scott_ · « **Reply #4 on:** August 16, 2012, 10:37:05 PM »

Quote from: Motorandy123 on August 16, 2012, 07:46:00 PM

..... It is a PDF and I don't know how to post one page and it won't let me cut and paste.

Setup a 'xps' printer on your pc, then from within the Adobe program just print the single page to the 'xps' printer. '.xps' documents can be viewed with Internet Explorer.
That's how I do it at this point.

552255 · « **Reply #5 on:** August 16, 2012, 10:52:14 PM »

Check the MAXBMW schematic, i think there were various thickness' available, which may lead one to believe if there is space after following the tightening procedure, to shim the void. During a new frame installation, i had a large gap on the last frame/trans. bolt. i shimmed the gap, and things seem fine. No idea what would happen if you put a bit of tension on the frame by not using some spacers...it may affect alignment slightly?

TimTyler · « **Reply #6 on:** August 16, 2012, 10:53:46 PM »

Would a washer be any different than a shim?

Rick G · « **Reply #7 on:** August 16, 2012, 11:15:55 PM »

There would be absolutely no difference for that purpose, so long as it takes up the space.

Motorandy123 · « **Reply #8 on:** August 17, 2012, 11:33:10 AM »

Yes a washer is a shim just shim denotes you might have different thicknesses available.

Thanks for the tip on the XPS printer. I'll give that a try!

frankenduck · « **Reply #9 on:** August 17, 2012, 04:01:35 PM »

FYI: I've disassemlbed lots and lots of these bikes and have never seen a single one that had shims for the transmission mounts.

TimTyler · « **Reply #10 on:** August 17, 2012, 04:05:51 PM »

Quote from: frankenduck on August 17, 2012, 04:01:35 PM

FYI: I've disassemlbed lots and lots of these bikes and have never seen a single one that had shims for the transmission mounts.

Yes - I'll let it be.

The PDF (thx, Randy) seems to recommend using the shims on the front bolts anyway, not the bolts that mount to the transmission.

frankenduck · « **Reply #11 on:** August 17, 2012, 04:08:02 PM »

There is one that goes between the top of the bellhousing and the frame.

TimTyler · « **Reply #12 on:** August 17, 2012, 04:20:15 PM »

The bolt in the center of this picture is the one that seemed to want a shim.

ReneZ · « **Reply #13 on:** August 24, 2012, 03:27:43 AM »

You'll want to fit your frame as 'stress-free' as possible, so I would fit washers/shims to fill up the clearance as good as possible and then tighten it up.

Cheers, Rene

TimTyler · « **Reply #14 on:** August 24, 2012, 10:03:16 AM »

Where should I support the bike/frame in order to R&R that bolt?

When the bolt was out last time, the frame was supported by saw horses and the power train and rear wheel were removed.

Lawrence · « **Reply #15 on:** August 24, 2012, 08:30:37 PM »

I believe I read a BMW service bulletin that addressed these shims. It was related to quelling engine vibes and specified detailed procedures for shimming and torquing the fasteners.

frankenduck · « **Reply #16 on:** August 24, 2012, 08:39:55 PM »

Quote from: TimTyler on August 24, 2012, 10:03:16 AM

Where should I support the bike/frame in order to R&R that bolt?

If you're just doing one bolt at a time then you probably don't need to do anything special. That's what I'd do. (Actually I wouldn't bother with shimming it in the first place.)

TimTyler · « **Reply #17 on:** August 24, 2012, 08:57:31 PM »

Quote from: Lawrence on August 24, 2012, 08:30:37 PM

I believe I read a BMW service bulletin that addressed these shims. It was related to quelling engine vibes and specified detailed procedures for shimming and torquing the fasteners.

I found this bulletin on this bulletin list. Probably does not apply to me though.

Maybe this one.

I'm with Duck though. Will probably just leave it the way it's been for probably 21 years.

frankenduck · « **Reply #18 on:** August 24, 2012, 09:58:08 PM »

And there's also the issue of getting the trans out of alignment with the bellhousing - leading to potential premature spline death.

TimTyler · « **Reply #19 on:** August 24, 2012, 10:11:26 PM »

Quote from: frankenduck on August 24, 2012, 09:58:08 PM

And there's also the issue of getting the trans out of alignment with the bellhousing...

My bellhousing has the alignment shims that assure the transmission is mounted straight.

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Author Topic: Transmission Mount Shims ?? (Read 17258 times)

Motorandy123

Rick G

Motorandy123