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G5 LCS refurbish and refill info

I have finally refurbished my G5 2.7 LCS, I know there have been lots of discussions here about doing this but I thought, if there is any interest, I would add my 2 cents. Here is a pic of the finised refurb, if anyone needs advice etc on how to refurb your LCS post a question and I will do my best to answer.

User uploaded file

G5 Dual 2.7, Mac OS X (10.5.8), ATI Radeon 9650, 8GB

Posted on Mar 31, 2012 5:46 AM

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22 replies

Feb 15, 2017 12:47 AM in response to adtse

This other thread has a reply and a few older links that may be

useful to track down an existing source for the supplies which

were only used on a few builds of G5 Power Mac LC model.


Re: What is the green liquid?


Like any antifreeze-coolant, there are stablizer chemicals so to aid

in heat transfer and more efficient cooling of the processor via the

thermal parts; in the reply given in earlier thread where you had a

reply, look into the XLR8YourMac link. Also look into LowEndMac

site and or other fading-fast resources online for that LC G5 PPC.

Maybe ifixit.com repair guides may have something for this, also.


If you get the serial number of that model, you could use it to see

what kinds of parts (and perhaps locate copy of original service

manual online, in PDF) with original specifications. Here's one:


•Mac Serial Number Info - Lookup Your Mac Serial Number:

https://www.powerbookmedic.com/identify-mac-serial.php


Usually this source will show the product specs, and also a page

of replacement parts; power supplies & other bits. The Liquid Cool

model wasn't around very long -- as it was unreliable & hard to fix.


If you can find another owner of this same model you may ask if

they may want to take the one you are looking at, off your hands.

Some parts are harder to get than others; and someone whose

interest has been plagued by tinkering awhile, may want another.


In any event...

Good luck & happy trails! 🙂

Mar 31, 2012 12:49 PM in response to japamac

Thanks for the compliment japamac, it's working great, temps are 52 to 54 at idle, the fans are silent and are no longer 'ramping'. Using a 'T' bar made bleeding the block pretty easy and I am really happy with my 'new' G5. It was a fun project and not hard to do. New fluid, rings and tubing along with a little gasket sealant should ensure a few more years before I upgrade to a mac pro. Thanks to all who helped with advice and tips.

May 11, 2012 7:50 PM in response to Skorpan

Hey Buddy, I think I need your help. I just picked up two 2.5 G5 Quad's the PCI-X with LCS's one already leaked and killed the Power Supply the other is working but with 1 dead CPU. I wanna pull out the LCS from the dead Machine and Rebuild that LCS and Steal one of the Processors and bring one back to life with a rebuilt LCS so it so it won't die for a least a while. I can download the instructions on how to do it but was hoping for a list of parts you purchased to make yours look bad ***. I especially like the clear tubing can you use that all around? Hope you can get me that info. Thanks in advance.

May 14, 2012 1:59 AM in response to YZFNYC

OK, here goes.


Tubing - One metre, size is ID (inner diameter) 3/8 - OD (outer diameter) 1/2.

The tubing specs use both measurements which can be confusing but this is the best set-up I found.

Lots of colours are available but using clear is a good idea as you can check for air bubbles when you bleed the block later.


Clamps - Size, 1/2, I would replace all the clamps, the screw kind are easy to get on and tighten.


Anti Kink Coil - One metre, size ID 1/2, this helps keep the tubing open and the coolant flowing well.


Coolant - Feser One Cooling Fluid, any colour you like!


Thermal Paste - Artic Cooling MX4, The best thermal paste to date.


O-Rings - Brand is Viton, the size is 31.6mm x 2.4mm, these are a little bigger than the original rings and have a better fit and seal.(Note, my G5 is a Dual 2.7).


Gasket Seal - This is optional, I used it to add an extra layer of leak protection around the new o-rings. I used Permatex Ultra Grey, but any gasket sealer will do.


Filler plug - This is a great way to make filling and bleeding the block easy, the top screws off letting you fill the LCS and it also allows you to bleed the block easily.


http://www.watercoolinguk.co.uk/p/Enzotech-NPH-ID38-G14-38Inch-10mm-Knurled-Barb --Inc-Blank_4324.html


T-Bar - Adding a T-bar allows you attach the extra tubing for the filler plug to add fluid and bleed the system, air in the LCS is a major problem for cooling as well as pump damage.


I think that's everything, I live in Stocholm and used a couple of sites in Europe to get the parts I needed, you will be able to get the parts in the States I assume, but let me know if you get stuck and I'll help you.


When your ready to start let me know, and I can offer some help / tips make the refurb a little easier.


Good hunting!

May 26, 2012 1:27 PM in response to Skorpan

hey i need some help with mine i have the quad 2.5 8GB of ram cpu b over heats in about 10mins so someone said rebliead it the water has dryed up cuz there was no leeks so i did.put clean water in got all the air mostly out but one small bubble b 4 the pump tryed runing it to get it out but the pumps not pumping that good i used a old pc power box and some clips to do that but now it over heat in like 2 mins ??? oh and i put new cpu paste on it idk im stomped??? idk mabe its an air lock but i blow water throw it i dont really have money for parts the water alone was 6 bucks plez help poor kid in canada ive been fixing comps for awhale this is my frist lcs and its a pain

G5 LCS refurbish and refill info

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