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Working on the G5 quad liquid cooling system

25285 Views 245 Replies Latest reply: Jul 21, 2013 10:17 PM by G5Lover RSS Branched to a new discussion.
  • BMaverick Level 1 Level 1 (10 points)
    Currently Being Moderated
    Mar 8, 2012 6:03 PM (in response to Fipps)

    The thermal paste used on the LCS blocks is Shin-Etsu MicroSI X23-7762.  The formula works well under higher thermal loads than the AS-C.  The X23 was chosen since it is non-conductive. 

     

    When ordering the X23, make sure the tube is within 6 months of manufacture for the best results.  To store, place in a clean coffee mug in the back of your fridge with the applicator tip facing down.  This will extend the shelf life many more months.

     

    When applying the thermal paste, do a dot-by-dot matrix application on the block surface.  Do not place a glob in the center to smear outward.  A typical pattern would look like this: http://img20.imageshack.us/img20/3466/pastespots.jpg    Each dot must be a miniscual dab.


  • Fipps Level 1 Level 1 (0 points)
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    Mar 9, 2012 12:49 PM (in response to Heikki Lindholm)

    You both may be right for the thermal grease (also AS Ceramique worked quite well for me up to now and should at least be non-conductive too). Anyway, the Shin-Etsu is available here to an affordable price. So i will give this a try. Very soon, i think. Also the dot matrix application is valuable advice. I used to work from the center too.

     

    But i have my doubts, the thermal grease thing beeing the main reason for the persisting heat problems. I'm afraid, symptoms are more likely pointing in the direction of too little coolant interchange at the cooling point, as temps are ok as soon as the pump spins up. So i will check this again.

     

    As for the Apple "Service" People, they seem to be the same anywhere in the world. If you like to fix instead of buying new, in particular older parts, you're on your own.

     

    Yes, comparable results would be nice. I can provide some space accessible by ftp. Is the mail adress at the end of your work log still active to send you the account data?

  • BMaverick Level 1 Level 1 (10 points)
    Currently Being Moderated
    Mar 9, 2012 5:33 PM (in response to Fipps)

    Well, all of the pumps are shown here in the last image:

     

    http://bmaverickddcpumps.wordpress.com/buy-ddc-pumps-here

     

    This should give you a clue.

     

    Lately, the RASA owners are snarfing up the pumps more frequently than any other WCing group.  It seems that the RASA 750 pump is flawed and there is really no good replacement for the loop other than a compact DDC-1T at 10W.  XSPC has sold several hundred of these WCing kits.  The pumps last about 1-1/2 years, just after warranty before dying.

  • Otis1 Level 1 Level 1 (0 points)
    Currently Being Moderated
    May 26, 2012 2:00 PM (in response to Heikki Lindholm)

    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 cuz 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 to pump it out but its not pumping that good i used a old pc power box and some clips to make it faster but didt even make the bubble move

     

    btw also toke the pump apart looked good.. replaced some hose put some good clear hose on 2 c for air

    idle is now at 59 on cpu a and 85 on cpu but the monet i use it. it over heats

     

    maybe my pumps **** it works but its not pumping good if at all

     

    idk im stomped mabe its an air lock but i put water in the pump i dont really have money for parts the water alone was 6 bucks plez help poor kid in canada this is my frist lcs and its a pain cuz its apple

  • Ramón G Castañeda Level 4 Level 4 (1,445 points)
    Currently Being Moderated
    Jul 22, 2012 2:23 PM (in response to Heikki Lindholm)

    Thank you far sharing this, Heikki.  Very impressive documentation.

  • pocketprobe Level 1 Level 1 (0 points)

    What are the phillips screws on the edges of the water block? I ended up destroying most of my screws removing them,

  • BMaverick Level 1 Level 1 (10 points)
    Currently Being Moderated
    Sep 17, 2012 6:45 PM (in response to pocketprobe)

    The screws will always break taking them out, they were installed with Loctite.

     

    If memory servers, those are M3.  Don't recall the thread spacing though. 

     

    http://bmaverickddcpumps.wordpress.com/g5-spare-parts

  • CGFMaster Level 1 Level 1 (0 points)
    Currently Being Moderated
    Oct 21, 2012 10:43 AM (in response to Heikki Lindholm)

    I've read through the whole post and I want to hook up the Panasonic version up to a GPU.
    First though I want to see if it still works via a PSU.

    But I can't determine what the pinout is for the voltages/tach on the wiring.

     

    There are only 6 connection points at the MB side of the adapter, but midway throught the wires it has a 6 connection adapter in which the outermost pins have 1 wire input (from MB side) and a two wire output to the LCS side). Would that be indicative of a 12v or a GND? Both of the wires are connected to the one wire coming from the MB.

     

    I can get pictures of the pump circuit board if needed. The model number didn't return any search results.

  • Patrick 01 Level 1 Level 1 (80 points)
    Currently Being Moderated
    Feb 11, 2013 7:22 AM (in response to Chris323i)

    Chris323i wrote:

    I found it interesting that Apple used this very elastic tubing inside these flexible plastic hosing bits found on the underside of the radiator.

     

     

     

    I also found it interesting that Apple essentially sealed off these aluminum ports found on the topside of the radiator but still used a heavy amount of sealant around them and capped them off with rubber caps.

     

    Chris323i:

    I have the same unit

    Did you keep the flexible pastic hosing or replace it?

    I see the valves where you cut the ports and used a clamp, are they holding up[ as there is no barb ?

  • romko23 Level 2 Level 2 (395 points)
    Currently Being Moderated
    Feb 11, 2013 12:06 PM (in response to Patrick 01)

    Sorry to chime in, but is your LCS the dual or single version? The single is by far the more reliable one and it might just be to your advantage to replace the dual with the single pump.. Those came with the later 2006 G5 Quads between April and August of 2006.

  • Patrick 01 Level 1 Level 1 (80 points)
    Currently Being Moderated
    Feb 11, 2013 12:38 PM (in response to romko23)

    romko23 wrote:

     

    Sorry to chime in, but is your LCS the dual or single version? The single is by far the more reliable one and it might just be to your advantage to replace the dual with the single pump.. Those came with the later 2006 G5 Quads between April and August of 2006.

     

    I've done a lot of googling and found many statements that the dual version (cooldigy / dephi) is the more more reliable. Some even stating it was the later design. So I can't say for sure. I'm content to stick with my dual as it shows no signs of leakage nor crystalization nor low fluid etc . . I also have a dual panasonic in my 2.7 and that was considered a better design as well by some.

    So who's to say . . .

     

    My  issue is cpu B temps are higher then cpu A cores by 15 on one and 20 the other

    This is only in highest performance with the cpus maxed and stays well below temp

    At reduced performance and max cpus the difference is much less

    At idle and regular use the temps are very close

     

    I'm thinking the cpu B pump might have some build up or is weak etc . .

    May swap cpu positions and see if the temp issue follows the cpu or stays the same

    Id like to flush any debris or build up in the pumps  or replace the pump as needed

    Any thoughts towards this are appreciated

  • romko23 Level 2 Level 2 (395 points)
    Currently Being Moderated
    Feb 11, 2013 9:32 PM (in response to Patrick 01)

    Patrick,

     

    I read somewhere, can't remember the website that the single pump came out in April 2006 up until the end of the Quad's run which was August 2006. The dual pump LCS was the first I believe. I will have to research it a bit more.

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