Author Topic: reccomendation for vacuum filler for coolant  (Read 563 times)

Offline Batkinson

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  • retread rider....KZ650 30 yrs ago,85 BMW K100 now
reccomendation for vacuum filler for coolant
« on: November 29, 2022, 12:29:46 PM »
trying to revive a 92 k75 that has been sitting while i was unable to ride and am looking for recommended vacuum filler pumps for coolant..

 
  • Hampton Roads, VA
  • 85 K100, 92 K75
85 K100, eng#F3M698745K335840559, FRAME: WB1051401F0050557,

92 K75  VIN:WB1057105N0133981

Offline frankenduck

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Re: reccomendation for vacuum filler for coolant
« Reply #1 on: November 29, 2022, 01:25:57 PM »
None.

Gravity works just fine and is the method recommended on Page 17-13 of the BMW K75/K100 Repair Manual.

http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/shopmanuals/BMW_K75_K100_Repair_Manual.pdf
Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
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Offline Batkinson

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  • retread rider....KZ650 30 yrs ago,85 BMW K100 now
Re: reccomendation for vacuum filler for coolant
« Reply #2 on: November 29, 2022, 02:10:38 PM »
Yes, thanks

I have moved the k75 to a friend’s heated attached garage so we can work on it, and he is seeking a way to change the coolant without the motor running because despite the big door being open the fumes go into his house.

This does not make his wife happy.

There are several videos online which show the use the of the vacuum filler and I am hoping to get some feedback as to one which works and any gotchas before moving on.

Thanks again tho
  • Hampton Roads, VA
  • 85 K100, 92 K75
85 K100, eng#F3M698745K335840559, FRAME: WB1051401F0050557,

92 K75  VIN:WB1057105N0133981

Offline frankenduck

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Re: reccomendation for vacuum filler for coolant
« Reply #3 on: November 29, 2022, 02:38:13 PM »
What makes you think that you need to have the motor running to change the coolant? You don't.
Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
New to K bikes? Click here.
K Bike Maintenance & Mods: Click here.
Buy parts here.

Offline stokester

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Re: reccomendation for vacuum filler for coolant
« Reply #4 on: November 29, 2022, 06:25:33 PM »
I've never had any difficulty changing coolant using gravity.  Sometimes I have to add a bit to the overflow reservoir after the first ride.

Where in Hampton Roads are you?  I live near the Yorktown Battlefield.
  • Yorktown Virginia
  • '94 K75S Dakar Yellow - '93 K75S Seiden Blau - '91 R100RT Bermuda Blue- '78 R100S Smoke Red

Offline The Mighty Gryphon

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Re: reccomendation for vacuum filler for coolant
« Reply #5 on: November 29, 2022, 06:29:17 PM »
The Duck is correct, you can fill about 95% of the cooling system just by slowly pouring the coolant in the filler and squeezing the hose on the lower right side of the engine to "burp" the air out. 

If you really want to pull a vacuum to purge all the "trapped" air, you can do it by sticking a vacuum cleaner hose in the filler for a few seconds.  I will leave it up to your creativity as to getting a seal and closing off the overflow hose to the bottle next to the battery.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS16V "Moby Brick Too"

Past:
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline Chaos

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Re: reccomendation for vacuum filler for coolant
« Reply #6 on: November 29, 2022, 06:56:08 PM »
I've used a vacuum pump to bleed the brakes but never needed anything other than gravity to change the coolant.
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
2012 Ural 2WD sidecar (BMW's bastard step child)

Offline The Mighty Gryphon

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Re: reccomendation for vacuum filler for coolant
« Reply #7 on: November 29, 2022, 07:10:22 PM »
In 50+ years so working on cars and bikes the only time I needed a vacuum filler was on a Mazda MX-5 which is well known for having passages in the block where air locks form to prevent coolant flow even when the engine is running. 
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS16V "Moby Brick Too"

Past:
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline frankenduck

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Re: reccomendation for vacuum filler for coolant
« Reply #8 on: November 29, 2022, 07:13:42 PM »
You really don't even need to burp it with the lower hose. If you undo the two 8mm nuts the hold the mounting for the radiator cap to the frame and hold that part up an inch or two then that allows the air right above the radiator to escape. That's how I've been doing it for years and never had an issue.

Even if there is some air in the cooling system then the cooling system tops itself off when the bike cools down. The radiator cap is just like that in a car. When the radiator cools down and creates a vacuum above 1.5 PSI it pulls coolant from the reservoir to top itself off.

In all my years of riding K bikes I've only had three cooling issues:

1 - Blew a hole in the big hose on the lower right on a K1100RS. Replaced the hose. (A few hundred miles after I'd changed the coolant and squeezed it - which is why I no longer squeeze radiator hoses and always carry a roll of Rescue Tape when touring.)

2 - Bad radiator cap that would blow too early on an 86 K75 with 125K miles. I could tell because the cap would blow before the coolant light in the cluster came on. Replaced the radiator cap and it's run fine ever since.

3 - Dead fan on a K1100LT. Rode another 2,000 miles. Just turned the bike off and if I had to sit in hot weather at a light. Then just restarted when the light turned green because as long as a K is moving at decent speed the fan isn't needed. Replaced the fan when I got home.
Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
New to K bikes? Click here.
K Bike Maintenance & Mods: Click here.
Buy parts here.

Offline Batkinson

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  • retread rider....KZ650 30 yrs ago,85 BMW K100 now
Re: reccomendation for vacuum filler for coolant
« Reply #9 on: December 02, 2022, 02:46:05 PM »
Haynes manual 5.2 section 4 step 6 says to rub engine till thermostat opens….is that not necessary?
  • Hampton Roads, VA
  • 85 K100, 92 K75
85 K100, eng#F3M698745K335840559, FRAME: WB1051401F0050557,

92 K75  VIN:WB1057105N0133981

Offline Laitch

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Re: reccomendation for vacuum filler for coolant
« Reply #10 on: December 02, 2022, 07:25:53 PM »
Haynes manual 5.2 section 4 step 6 says to rub engine till thermostat opens….is that not necessary?
My copy of Haynes doesn't indicate doing that but if you’re going to rub the engine to warm it up, I recommend wearing bison or elk leather gloves because they are stronger than cowhide or pigskin yet more supple. You don’t want to damage your hands until you can’t grip the handlebar without having skin grafts first. :nono2:
  • Along the Ridley in Vermont.
  • 1995 K75 83,000 miles
I wept because I had no radials until I met a man who had no splines.
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Offline Chaos

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Re: reccomendation for vacuum filler for coolant
« Reply #11 on: December 02, 2022, 08:29:44 PM »
Haynes manual 5.2 section 4 step 6 says to rub engine till thermostat opens….is that not necessary?

I always just topped it off, burped it, then after a good ride checked the level in the overflow.  I guess you could rub it but I, unlike Laitch, would use a power rubbing machine.
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
2012 Ural 2WD sidecar (BMW's bastard step child)

Offline Batkinson

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  • retread rider....KZ650 30 yrs ago,85 BMW K100 now
Re: reccomendation for vacuum filler for coolant
« Reply #12 on: December 03, 2022, 10:08:13 AM »
did the drain, flush, and refill without the engine running, as per some experienced advice from the forum.

worked fine, and a quick run after showed no change in the level of coolant in the reservoir or the radiator.

didn't need gloves though, callused hand from many years of rubbing. thanks for the info

btw...by the shipyard in the historic district
  • Hampton Roads, VA
  • 85 K100, 92 K75
85 K100, eng#F3M698745K335840559, FRAME: WB1051401F0050557,

92 K75  VIN:WB1057105N0133981

Offline The Mighty Gryphon

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Re: reccomendation for vacuum filler for coolant
« Reply #13 on: December 03, 2022, 11:01:30 AM »
 icon_cheers
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS16V "Moby Brick Too"

Past:
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline kris

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Re: reccomendation for vacuum filler for coolant
« Reply #14 on: December 05, 2022, 11:11:21 AM »
Hey Batman,
You would do well to listen to Frankenduck and Gryphon if you ask them a question and they provide an answer. These guys have encyclopedic knowledge of these bikes and other mechanical applications. And they wouldn't steer you wrong. Just a suggestion after having read the thread. These beasts are pretty forgiving, it seems to me. A little air in the system is no biggie. It's the damn spline shaft maintenance that makes me crazy! How could these guys design this bike with such a glaring Achilles Heel?!
  • In The Hammer!! Hamilton, Ontario, Canada
  • 1986 K100RT (Heinz) 2004 Kawasaki Concours (Eddy) 2007 Moto Guzzi Breva 1100 (Linda) Previous: 1968 Honda CD175 1973 Kawasaki S2350 1975 Honda CB550K
"I got bike fever bad!!"

Offline Batkinson

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  • retread rider....KZ650 30 yrs ago,85 BMW K100 now
Re: reccomendation for vacuum filler for coolant
« Reply #15 on: January 10, 2023, 05:16:00 PM »
sorry for the late response, but i do want to share the Haynes manual info that was leading me astray.

i appreciate the knowledge here in the old heads, but sometimes I'm not around my pc to ask before i start something
  • Hampton Roads, VA
  • 85 K100, 92 K75
85 K100, eng#F3M698745K335840559, FRAME: WB1051401F0050557,

92 K75  VIN:WB1057105N0133981

Offline The Mighty Gryphon

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Re: reccomendation for vacuum filler for coolant
« Reply #16 on: January 10, 2023, 05:21:20 PM »
My recommendation is to throw your Haynes manual away. 
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS16V "Moby Brick Too"

Past:
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline Batkinson

  • Dumbass Level 1
  • Motobrick Curious
  • Posts: 39
  • retread rider....KZ650 30 yrs ago,85 BMW K100 now
Re: reccomendation for vacuum filler for coolant
« Reply #17 on: January 10, 2023, 05:29:20 PM »
LOL!

begging to believe you are correct
  • Hampton Roads, VA
  • 85 K100, 92 K75
85 K100, eng#F3M698745K335840559, FRAME: WB1051401F0050557,

92 K75  VIN:WB1057105N0133981

Offline The Mighty Gryphon

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Re: reccomendation for vacuum filler for coolant
« Reply #18 on: January 10, 2023, 06:45:05 PM »
I had both, the Haynes and the Clymer along with a digital BMW Factory manual on my laptop.

There were at least two or three errors that I ran across in the Haynes that made me wary of what I was reading.  That, along with awful photos and confusing writing got it relegated to the bookshelf while the other two manuals stayed in the garage and got their pages dirty.  I eventually gave the Haynes away with one of the bikes I sold.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS16V "Moby Brick Too"

Past:
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

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