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Discussion Starter · #1 ·
Another thought guys, do you think I should change 12 year old coolant?<G> I plan on using Prestone green premix. Any thoughts, caveats etc.?

Thanks, Robert
 

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The pH level of the coolant mixture changes over time (age). I've seen some radiators attacked and ruined by neglect to service the cooling system, also failed head gaskets for the same reason. Make sure you select the correct coolant, mix 50 - 50 with de-ionised water and ensure the cooling system is completely full, otherwise you lose some heat transfer capacity at lower speeds. Check a couple of times after the job is done and engine is really cold. The radiator cap can be removed without taking off any plastic. Use a mifrror to determine that the top tank is completely full (bike on centre stand), top up as necessary, make sure the radiator cap goes back on properly. Tip - use some silicone lube on the radiator cap rubber gasket and it will turn heaps easier.
 

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Discussion Starter · #4 ·
K100Dennis said:
The pH level of the coolant mixture changes over time (age). I've seen some radiators attacked and ruined by neglect to service the cooling system, also failed head gaskets for the same reason. Make sure you select the correct coolant, mix 50 - 50 with de-ionised water and ensure the cooling system is completely full, otherwise you lose some heat transfer capacity at lower speeds. Check a couple of times after the job is done and engine is really cold. The radiator cap can be removed without taking off any plastic. Use a mifrror to determine that the top tank is completely full (bike on centre stand), top up as necessary, make sure the radiator cap goes back on properly. Tip - use some silicone lube on the radiator cap rubber gasket and it will turn heaps easier.

OK Dennis, you said to use the "correct" coolant, that would be...?
Thanks, Robert
 

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green is no longer available - at least here - it is actually yellow and is advanced formula for all the new cars - put it in mine - used prestone/motomaster for years in my K100 and K1100 - if uncertain use BMW blue for that warm fuzzy feeling

all antifreeze has a lifetime, max 5 years?

I filled it the same ways as a modern car, fill to top of rad, idle till warm making sure rad stays full, make sure there is fluid in overflow, put cap on let cool, overflow will probably go down as fluid is sucked back into motor and will rise when you get it hot - has always worked for me
 

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2 quarts of BMW blue antifreeze, 2 quarts of water. A gallon jug will get you 2 changes. The service manual says to knead the hoses as you fill the radiator. That will push the fluid to both radiators and around the engine. Still have to run it to get all the air out of the system and completely full. Easy to do.

You may want to get some radiator flush if the coolant hasn't been changed in 12 years! :eek: Might be just a bit of corrosion in there. You can see in the left radiator, but you'll have to remove a lot of stuff to be able to do it.
 

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Scouter-50 said:
Another thought guys, do you think I should change 12 year old coolant?<G> I plan on using Prestone green premix. Any thoughts, caveats etc.?

Thanks, Robert
The shock of proper maintenance may be too much for your LT to withstand! Seriously, I just put Prestone in mine as it seems to meet all of the requirements for being nitrate, phosphate, etc., free.
 

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The guys have pretty well answered I believe. Obviously the US has different specs on this chemical than here in Oz. We still use the Ethyl Glycol based coolant (green). But as they state, if in doubt, go for the BMW stuff. Lots to lose and not much to gain by compromising on cost or getting it wrong. Basically you must use a coolant that is suitable for aluminium engines. I did all the kneading etc, but I still had an issue with air in the system, which compresses under pressure as the engine gets hot, so rather than be pushed out into the expansion tank, it doesn't happen and the cooling system efficiency is compromised. That's why you will notice a change on the temp bar indication at lower speeds if the system isn't 100% full of coolant only. When I checked the coolant level I actually tilted the bike to the right slightly and placed a packer under the left side of the centre stand. This makes the radiator cap the upper-most point and any air apace can easily be seen and replaced with water. I topped mine off with a plastic tube and syringe, it took an additional 250 mls. Made the difference to the problem I have described. Hope this helps, Dennis
 

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Discussion Starter · #10 ·
K100Dennis said:
The guys have pretty well answered I believe. Obviously the US has different specs on this chemical than here in Oz. We still use the Ethyl Glycol based coolant (green). But as they state, if in doubt, go for the BMW stuff. Lots to lose and not much to gain by compromising on cost or getting it wrong. Basically you must use a coolant that is suitable for aluminium engines. I did all the kneading etc, but I still had an issue with air in the system, which compresses under pressure as the engine gets hot, so rather than be pushed out into the expansion tank, it doesn't happen and the cooling system efficiency is compromised. That's why you will notice a change on the temp bar indication at lower speeds if the system isn't 100% full of coolant only. When I checked the coolant level I actually tilted the bike to the right slightly and placed a packer under the left side of the centre stand. This makes the radiator cap the upper-most point and any air apace can easily be seen and replaced with water. I topped mine off with a plastic tube and syringe, it took an additional 250 mls. Made the difference to the problem I have described. Hope this helps, Dennis
Thanks, Guys. I guess I will go with BMW blue. I'll have to get some at Wild West BMW after the tech day in Fulshear.

Robert
 

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Scouter-50 said:
Thanks, Guys. I guess I will go with BMW blue. I'll have to get some at Wild West BMW after the tech day in Fulshear.

Robert
Why not get it before and do the change at the tech session? I know there is at least 2 qts in my garage,maybe more. Won't know until I get home Wed.

Dan
 

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Discussion Starter · #12 ·
DanMartin said:
Why not get it before and do the change at the tech session? I know there is at least 2 qts in my garage,maybe more. Won't know until I get home Wed.

Dan
Dan, I just found out today that I have an opportunity to get to Wild West Wednesday afternoon. I will pick up the juice and some plugs for Saturday. Do you need me to pick up anything for you while I am there? I would be happy to do so.
Robert
 

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Robert,
Thanks but I can't think of anything I need,at least from there anyway. Not that there is anything wrong with Wild West.

I would say I'm ok,but that's wrong or I'm good,but that's wrong too.

See you Sat.
 
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