1 2 3 4 5 6 Previous Next 245 Replies Latest reply: Jul 21, 2013 10:17 PM by G5Lover Go to original post Branched to a new discussion.
  • 45. Re: Working on the G5 quad liquid cooling system
    BDAqua Level 10 Level 10 (116,470 points)

    Nice work, thanks

  • 46. Re: Working on the G5 quad liquid cooling system
    BMaverick Level 1 Level 1 (10 points)

    Let's keep this LCS thing simple.  Seems that people are getting the wrong LCS makers confused in postings/replys.

     

    1-pump Laing DDC LCS = Delphi

     

    2-pumps Laing DDC LCS = CoolIT

     

    2-pumps; one each atop water-blocks LCS = Panasonic

  • 47. Re: Working on the G5 quad liquid cooling system
    subsidence Level 1 Level 1 (0 points)

    Silcone is an excelent material for the LCR. Delphi has been making liquid coolers for 75 years. Half of us on this thread most likely have Delphi parts in our cars Domestic or Foreign. The issue is so simple though. Placing a chamber of liquid directly above delicate electronics is a recipe for fails.

     

    What I think really went wrong in these O-Rings is that it wasnt so much physical liquid leaking out..It was rather slow evaporation and vapors that seep through the o-ring while under high CPU heat loads, this then eats away at the heat plates and CPU. Yes Im sure many fails have happened from o-ring cracks and tube leaks..those being the extreme. I have my Dual 2.5 G5 running good. I check it from time to time and also frequent these cooling threads to keep on the finds of DYIers in the need I have to overhaul it. ATM I see no need too as my inspections come back good.

     

    FWIW..Go with Viton material its wonderful when used with glycol and other presurized heated lliquids. In fact i might be overkill..lol

  • 48. Re: Working on the G5 quad liquid cooling system
    BMaverick Level 1 Level 1 (10 points)

    Silcone is a good material.  However, I would not allow the silicone to cure around any electrical components or contacts within 30 feet.  And even then allow the cure process to take two weeks to ensure the cure shape took hold. 

     

    Silicone contamination of electrical switch contacts can lead to failures by causing an increase in contact resistance, often late in the life of the contact, well after any testing is completed when the product is in the consumers hand.  All that is requied is a silicone spray or silicone to cure around these contacts.

     

    How many contacts in a basic computer .... hundreds !

     

    Contacts are CPU to MB, graphics card to MB, the main power switch, the connections to each hard drive, the USB port and any port on the computer, etc .... 

     

    Also, I would agree Delphi (GM Harrison Radiator, ACG) has been making cooling products for nearly a century.  However, like any company, they too have had recalls, quality spills, and liability blunders.

  • 49. Re: Working on the G5 quad liquid cooling system
    Chris323i Level 1 Level 1 (0 points)

    Wow, thank you for this detailed write-up! I will be using your information as a valuable reference.

    I just purchased a used Quadcore G5 with dual Delphi cooling units and this issue hit me at complete surprise as I thought leaking was the only issue revolving around Powermacs. Consequently, leaking was the only thing I checked for during before my purchase of the machine. During my last successful boot-up I managed to download iStat Pro and I carefully watched as CPU B temperature reached 80*C before the computer shut itself down. CPU A only reached ~50*C max during that last operation, which lasted about 10-15 minutes total. The fans seemed to stay at about a medium speed from boot-up until shut down. Any attempts to start the Powermac after a successful boot results in an expected hang-up after the chime and the two signature red LEDs activated inside the Powermac. The Powermac must be at ambient room temperature to boot successfully. Interestingly enough, the previous owner had been running the machine with no problems or excessive fan speed. I have been thinking that something in the pumps or radiator must have been dislodged when I layed the Powermac on its side when transporting it to my house.

    Anyhow, I will be attempting this cleanup of the internals when I get a chance. Thanks again!

  • 50. Re: Working on the G5 quad liquid cooling system
    Chris323i Level 1 Level 1 (0 points)

    Also, Heikki and those knowledgable on the subject, I was curious to find out what opinions are on replacing the Delphi pumps themselves during this whole process instead of cleaning them out? Would this create compatibility issues when running calibration from ASD disk since the pumps are not Delphi?

    I have come across this product on another forum as a possible replacement for the Delphi units. http://www.svc.com/mcp355.html

  • 51. Re: Working on the G5 quad liquid cooling system
    Chris323i Level 1 Level 1 (0 points)

    Judging by the specifications for the Delphi MCP355 pumps listed here: http://www.sidewindercomputers.com/swiftechmcp355.html I am reading that the mean time between failures is listed as 5 years. This is almost reason enough to replace them both as the units are now over 6 years old. This is taking into account those that like to leave their Quad cores on for most of the machine's lifetime.

  • 52. Re: Working on the G5 quad liquid cooling system
    Heikki Lindholm Level 1 Level 1 (135 points)

    Chris, I've been meaning to update my writeup on the subject of pumps. Apple used Laing (Delphi branded) DDC-1 pumps in the Dual G5 LCS, and DDC-2 and DDC-3.2 pumps in the Quad G5 LCS. The Swiftech MCP350 and MCP355 were these same Laing models, rebranded. From past discussions here you might be fooled to think that you can just go to a PC store and get a Swiftech or a Laing to replace the pump(s). However, that's not the case anymore. Laing changed the electronics in the pump and all the current models, sold as Laing DDC-1T/1Tplus and Swiftech MCP350/355, are incompatible with the Power Mac G5 signalling.

     

    My advice is to be VERY CAREFUL with the pumps. Applying voltage to a wrong pin will destroy the pump, and finding a replacement will be difficult.

     

    That said, the best replacement for the Quad G5 pumps is the DDC-3.2, which can be identified from a "3.3" sticker on the PCB of the pump. The DDC-2 pumps are also compatible, but they're notorious for breaking down; they were too powerful or something. For the Dual G5 machines, bmaverick has a hoard of DDC-1 pumps that are compatible with the Dual G5 pump control, and his pumps are new. Finding DDC-2 or DDC-3.2 pumps unused seems very unlikely.

     

    You actually can use the newer pumps with the Quad G5, but you will lose the motor control, which in practice means the pump will run slightly louder than the fans. AFAIK, the Dual G5s can't even read the tacho/rpm signal of the newer pumps.

  • 53. Re: Working on the G5 quad liquid cooling system
    Heikki Lindholm Level 1 Level 1 (135 points)

    One additional note. The "3.3" PCB pumps can also be identified by looking at the wires coming out of the pump. The wires should be black, yellow, blue, in that order, for the correct version of the pump. Trouble the dealer to check this before buying. With some luck, some dealers still have old stock of the DDC-3.2 pumps.

    (See http://www.techpowerup.com/forums/showthread.php?t=72085 for picture of a compatible pump PCB)

     

    Good luck with the project!

  • 54. Re: Working on the G5 quad liquid cooling system
    Chris323i Level 1 Level 1 (0 points)

    Just to note the difference between the arrangements. Hosing is reduced in the Quad core by a significant amount. I will be cleaning out the pumps and radiator within the net few weeks and I will be updating everyone on any performance improvements.

     

    /___sbsstatic___/migration-images/173/17388778-1.jpg

  • 55. Re: Working on the G5 quad liquid cooling system
    Ramón G Castañeda Level 4 Level 4 (1,445 points)

    Chris323i wrote:

     

    Just to note the difference between the arrangements. Hosing is reduced in the Quad core by a significant amount…

     

    /___sbsstatic___/migration-images/173/17388994-1.jpg

     

    That's a most illustrative and helpful picture, thank you—especially from those of us who have been just too chicken to take our Quads apart.  (Hope your thumb is OK now.  )

     


    Chris323i wrote:

     

    …and I will be updating everyone on any performance improvements…

     

    Duly and truly appreciated.  

  • 56. Re: Working on the G5 quad liquid cooling system
    subsidence Level 1 Level 1 (0 points)

    BTW. Anyone having luck recalibrating the fans?

  • 57. Re: Working on the G5 quad liquid cooling system
    BDAqua Level 10 Level 10 (116,470 points)

    Have you tried the ASD for your G5,either 2.5.8 or 2.6.3?

  • 58. Re: Working on the G5 quad liquid cooling system
    Chris323i Level 1 Level 1 (0 points)

    Here are a few extra pictures I managed to grab during the teardown.

     

    This photo was taken showing both processor boards attached to the cooling system.

    /___sbsstatic___/migration-images/174/17404533-1.jpg

     

     

    Here you can see how large of a difference this plumbing system varies from the dual core setup.

    /___sbsstatic___/migration-images/174/17404533-2.jpg

     

     

    Here I was taking a picture of the unique tubing that is located on each side of the copper blocks. This plastic material seems much weaker than the thick tubing located near the radiator. Also note the extra sealer. It can be found at every hose attachment point.

    /___sbsstatic___/migration-images/174/17404533-3.jpg

  • 59. Re: Working on the G5 quad liquid cooling system
    Heikki Lindholm Level 1 Level 1 (135 points)

    Just to make sure the confusion doesn't arise again: these pictures are from a "version 2" of the Quad G5 LCS (mine was "version 1", which in turn is a 2nd generation Delphi unit). IMHO, they really went overboard on the version 2 epoxying even the pump connections. The barbed connections in combination with the rubber hose are already very tight and very unlikely to leak even without the clamps, let alone the epoxy.

     

    Chris, could you take a close-up of the pumps' power connection, so that the jumpering on the pumps' side of the connection is visible? The jumper, as far as i can understand, decides which LCS version (i.e. how many pumps) the motherboard thinks there is.

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