BMW K bikes (Bricks)

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1Back to top Go down   Battery tray  Empty Battery tray Sat Nov 19, 2022 8:45 am

Fatpete1974uk

Fatpete1974uk
active member
active member
Hi all.

Bought a new battery tray which was pre drilled to fit the existing BUT my existing holes look like they have blanking plates over them. Do the press out or are they screwed in? Or are they even BMW fitment at all and somebody has added them?

Pete

    

2Back to top Go down   Battery tray  Empty Re: Battery tray Sat Nov 19, 2022 9:04 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I am thinking that the"blanking plates" are broken rubber vibration mounts.  They should unscrew from the transmission.


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down   Battery tray  Empty Re: Battery tray Sat Nov 19, 2022 9:46 am

Fatpete1974uk

Fatpete1974uk
active member
active member
Ah okay. Thats good news. Didn’t want to start destroying things trying to remove them and then have to make them look good again 😂

Thanks for the reply

    

4Back to top Go down   Battery tray  Empty Re: Battery tray Sat Nov 19, 2022 9:50 am

Fatpete1974uk

Fatpete1974uk
active member
active member
Hmm, no. Seems that they are metal. 
Point-Seven-five wrote:I am thinking that the"blanking plates" are broken rubber vibration mounts.  They should unscrew from the transmission.

    

5Back to top Go down   Battery tray  Empty Re: Battery tray Sat Nov 19, 2022 10:10 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Are you looking at four metal discs about 2cm in diameter?  If yes, what you see are the metal parts of the vibration dampers after the rubber bit comes off.

This is what the "new improved" version looks like:


Battery tray  Rubber10


It's not uncommon for them to be broken from the weight of the battery and the forces on it pulling against them.  Corrosion also leads to them breaking. 

If you want to remove them, it will probably take a lot of penetrating oil and heat.  Then grab them with vise grips and unscrew them from the top of the transmission.


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

6Back to top Go down   Battery tray  Empty Re: Battery tray Sat Nov 19, 2022 11:08 am

Fatpete1974uk

Fatpete1974uk
active member
active member
That makes sense now I’ve looked again. I thought that someone may have siliconed them in place but that’s obviously the remains of the rubber mount. Thanks for your responses, I’ll bet busy with the wd40 and the blowtorch 😂😂
Point-Seven-five wrote:Are you looking at four metal discs about 2cm in diameter?  If yes, what you see are the metal parts of the vibration dampers after the rubber bit comes off.

This is what the "new improved" version looks like:


Battery tray  Rubber10


It's not uncommon for them to be broken from the weight of the battery and the forces on it pulling against them.  Corrosion also leads to them breaking. 

If you want to remove them, it will probably take a lot of penetrating oil and heat.  Then grab them with vise grips and unscrew them from the top of the transmission.

    

7Back to top Go down   Battery tray  Empty Re: Battery tray Sat Nov 19, 2022 12:15 pm

duck

duck
Life time member
Life time member
As noted, Vise-Grips are good for removing them. However that plate is very thin so it helps if you push down on the Vise-Grips to make sure they're flush with the transmission.  Use the side of the Vise-Grips to get the teeth to bite into sides of the lip.

When installing replacements use anti-seize and don't uber tighten them.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

8Back to top Go down   Battery tray  Empty Re: Battery tray Sat Nov 19, 2022 2:48 pm

moriarti

moriarti
Life time member
Life time member
With a little care you can TACK WELD a nut to the plate then use a socket to remove .This way gets heat well into the stud and is far better than a blowtorch Very Happy Very Happy


__________________________________________________
1984 k100 rs red/black VIN  0004449
    

9Back to top Go down   Battery tray  Empty Re: Battery tray Sat Nov 19, 2022 3:09 pm

duck

duck
Life time member
Life time member
Another way to get it out would be to use a center punch radially near the perimeter of the little round disc. Once you get it started turning a bit then you can just be able to unscrew it by hand.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

10Back to top Go down   Battery tray  Empty Re: Battery tray Sat Nov 19, 2022 3:15 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
WD40 is not a real penetrating oil.  You would be better off getting a real penetrating oil or better yet making your own. 

There are tests that show the best lubricant for loosening corroded fasteners is a 50/50 mix of acetone and Automatic transmission fluid.  If you don't want to buy a whole liter of acetone, get a bottle of nail polish remover and use that.  The bonus is that many of them come with a small brush that you can use to apply the mix to the rusted part.

Don't worry about having nearly all of a liter of ATF hanging around.  What you don't use for penetrating oil makes an excellent fork oil.  It's the right viscosity, has viscosity stabilizers, corrosion inhibitors, and seal preservative, too.  I don't know about their current bikes, but I know Honda used to specify it for the forks and rebuildable shocks on their competition bikes bikes back in the 70's and 80's when I was riding them.


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

11Back to top Go down   Battery tray  Empty Re: Battery tray Sat Nov 19, 2022 3:50 pm

Dai

Dai
Life time member
Life time member
Point-Seven-five wrote:There are tests that show the best lubricant for loosening corroded fasteners is a 50/50 mix of acetone and Automatic transmission fluid.
Nope. It's a 50/50 mixture of carbontetrachloride and ATF. The guy that originated that test is really hacked off with seeing 'acetone' written down. ATF dissolves in CTC but not in acetone. I had the link to his results once but... It also turned out to be only marginally better than the commercially available Kroil which is... expensive. Very expensive in the UK. I paid £23 for 250ml and that was cheap compared to most prices I was seeing.

Also, another way to get buggered anti-vibration mounts out: https://www.k100-forum.com/t15894-bike-to-good-home - post 18. You'll need to click on the image links.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

12Back to top Go down   Battery tray  Empty Re: Battery tray Sat Nov 19, 2022 6:06 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
https://www.youtube.com/watch?v=xUEob2oAKVs

Personally, I have been using Liquid Wrench for over 50 years, ever since I worked in a gas station at the tender age of 19.  One of my tool boxes still has the now empty can I bought back in 1970. 

BTW, in this test the mixture he used was acetone/ATF. 

And the real winner is...

...HEAT! cheers


__________________________________________________
Present:
1994 K75RT
1991 K100RS


Past:
1988 K100RS SE
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

redrockmania

redrockmania
Silver member
Silver member
I've started a 1983 K100 resto. The ECU vibration dampers are similar to the battery tray dampers. The ECU threaded steel posts at each end of the rubber damper are M6 thread. Mine were stubbornly stuck. Because of the rubber damper I did not to apply heat from a gas torch for fear of weakening or destroying the rubber. My application of liquid penetrating fluid did not do the job. Eventually I removed the dampers by inserting 2 flat blade screwdrivers at 180 degrees to one another and gently driving their blades in under the bottom metal washer and levering with gradual increasing force. The rocking motion led to success and the shallow thread in the frame mounts are still able to be used. If the female threads in the frame mounts were damaged I could have fitted a clip type panel nut. 
One earlier forum post suggests cutting parallel sections out of the two metal end washers on the damper to allow you to use a spanner or pliers and exert enough torque to break free the seized threads. does this method not risk destroying the rubber part of the damper?
I'm replacing the vibration dampers anyway because of their 39 year old age. BMW originals are expensive. I've purchased on eBay some machinery vibration dampers with M6 threaded metal posts for a good price. I selected 10mm thickness for the dampers which allows me to fit rubber washers as shims to match the original thickness of the dampers. I'm going to apply anti-seize paste to the threads when refitting - ancient machines with threads of different metals invite corrosion and stuck fasteners.

    

14Back to top Go down   Battery tray  Empty Re: Battery tray Sat Nov 19, 2022 7:09 pm

Dai

Dai
Life time member
Life time member
redrockmania wrote:One earlier forum post suggests cutting parallel sections out of the two metal end washers on the damper to allow you to use a spanner or pliers and exert enough torque to break free the seized threads. does this method not risk destroying the rubber part of the damper?
As per the OP (post 6), there's no rubber left, just the bottom plate. You also don't need to be quite so accurate with the aftermarket anti-vibration washers as, IMNSHO Battery tray  44271 , it depends more on the battery height. I've fitted 15mm x 20mm replacements and I use a Motobatt AGM but I did have to mod the securing bar over the top to hold the overflow tank because the Motobatt is taller than the OEM battery. Additionally, because the battery tray threads on LFB were pretty close to being toast, I tapped to 8mm and made new securing posts.

(Yes, I'm laughing at myself)


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

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