ausmini
https://www.ausmini.com/forums/

Pumping up Hydro
https://www.ausmini.com/forums/viewtopic.php?f=2&t=54963		 Page 1 of 2
Author:  stef4360 [ Wed Jul 08, 2009 7:58 pm ]
Post subject:  Pumping up Hydro
I have just put some new displacers in the front on my mini.
My question is, how do you get the air out of the system? I have the proper dalek pump, however the vacuum pump will not hold a vacuum. The pressure pump works.
I have read here that I should pump it up on a hoist and then put the car on the ground and let the pressure down to get the air out. Is this correct? Cheers.
Author:  Morris 1100 [ Wed Jul 08, 2009 8:04 pm ]
Post subject: 
Don't pump it up on a hoist. I have heard of the rear struts falling out if the car is on a hoist.
Seeing how you have a proper pump, I would pump it up and let it down a few times till you get the air out. The air will come out as you let it down but it may take a few goes to get it all out.
Author:  drmini in aust [ Wed Jul 08, 2009 8:13 pm ]
Post subject: 
What M1100 said ^^ but let it down FAST, so the front displacers push the air (sitting in top of their hoses, highest point) out the back.
Just push the valve in with the pointy dome of the std steel valve cap.

BTW, this is how my local BMC used to do it for general pump ups, they seldom used the vacuum feature of that pump. :wink:
Author:  simon k [ Wed Jul 08, 2009 8:18 pm ]
Post subject: 
drmini in aust wrote:
Just push the valve in with the pointy dome of the std steel valve cap.


if he had the flash valve chuck like some of us use, he could neatly squirt it into a container like I do 8)
Author:  Morris 1100 [ Wed Jul 08, 2009 8:30 pm ]
Post subject: 
I just use a valve chuck and a bit of hose into a bottle. (Then I let the bottle sit for a long time and the crud settles on the bottom and I re-use the stuff off the top)
Author:  drmini in aust [ Wed Jul 08, 2009 8:30 pm ]
Post subject: 
simon k wrote:
drmini in aust wrote:
Just push the valve in with the pointy dome of the std steel valve cap.


if he had the flash valve chuck like some of us use, he could neatly squirt it into a container like I do 8)

I regard used hydro fluid like used brake fluid, only worse... :P
Author:  Morris 1100 [ Wed Jul 08, 2009 8:32 pm ]
Post subject: 
drmini in aust wrote:
simon k wrote:
drmini in aust wrote:
Just push the valve in with the pointy dome of the std steel valve cap.


if he had the flash valve chuck like some of us use, he could neatly squirt it into a container like I do 8)

I regard used hydro fluid like used brake fluid, only worse... :P

Frightened that something that is 66% water is going to be hydroscopic? 8)
Author:  drmini in aust [ Wed Jul 08, 2009 8:33 pm ]
Post subject: 
Frightened that it has rust molecules in it.. :lol:
Author:  Morris 1100 [ Wed Jul 08, 2009 8:40 pm ]
Post subject: 
drmini in aust wrote:
Frightened that it has rust molecules in it.. :lol:

And the hydro bags don't? :lol:

The rust and rubber (mostly rubber) settle to the bottom of the bottle leaving nice clean fluid on the top.
Author:  drmini in aust [ Wed Jul 08, 2009 8:43 pm ]
Post subject: 
I'm amazed the plated steel hydro pipes last as long as they do (touches wood).
Toyotas Mazdas etc use similar pipes for the heater lines around the motor, and they rot out way faster.
Maybe their plating is crap....
Author:  sgc [ Wed Jul 08, 2009 8:45 pm ]
Post subject:  Re: Pumping up Hydro
stef4360 wrote:
My question is, how do you get the air out of the system?


If you think about how the system works for a moment it becomes a little clearer :) When you pump it up from scratch, the system is full of air. The fluid you put in finds its way into the displacers, compressing the air as it does so. Put enough in and you get to the point where the displacers are filling up, and the air has to find the highest point in the system to accumulate, which is in the front hoses.

Then as Doc says, if you release the valves quickly the pressure in the displacers will blast the fluid in the lines out, shortly followed by the compressed air. It's the closest thing to a wet fart I've ever seen a Mini do :lol:

You can't do this in one cycle and get all the air out, because there's more air volume than will compress into 300psi with one fill. Do it 3 or 4 times and there'll be no air left.
Author:  miniDave [ Wed Jul 08, 2009 8:47 pm ]
Post subject: 
Morris 1100 wrote:
Don't pump it up on a hoist. I have heard of the rear struts falling out if the car is on a hoist.
Seeing how you have a proper pump, I would pump it up and let it down a few times till you get the air out. The air will come out as you let it down but it may take a few goes to get it all out.


I have tried this only once since putting everything back in. The front still sits a lot lower than the rear so I guess I will just repeat the process to get the front a little higher (even front to back).

Cheers
Author:  Panthersteve [ Wed Jul 08, 2009 8:49 pm ]
Post subject: 
Morris 1100 wrote:

The rust and rubber (mostly rubber) settle to the bottom of the bottle leaving nice clean fluid on the top.


I've had some old fluid sitting for at least 9 months and there is absolutely no settling out of anything. The fluid still looks like rusty water, exactly as it came out.

Steve
Author:  sgc [ Wed Jul 08, 2009 8:56 pm ]
Post subject: 
miniDave wrote:
The front still sits a lot lower than the rear


Sounds like the helper springs on the rear are a little bit tired...
Author:  simon k [ Wed Jul 08, 2009 8:59 pm ]
Post subject: 
drmini in aust wrote:
simon k wrote:
drmini in aust wrote:
Just push the valve in with the pointy dome of the std steel valve cap.


if he had the flash valve chuck like some of us use, he could neatly squirt it into a container like I do 8)

I regard used hydro fluid like used brake fluid, only worse... :P


don't worry - I don't re-use it, but I do prefer not to have it spray up my arm and in my eyes ;)
Page 1 of 2 All times are UTC + 10 hours
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/