Working on the G5 quad liquid cooling system

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?

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.

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

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

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.

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 ?

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.

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

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.

romko23 wrote:

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.

I'm keeping my dual unit and sorting out it's issues

Sp lease let me know if you have any advice on the dual

Thanks

I did actually replace the flexible hosing bits on the underside with the clear tubing I used everywhere else. This was unavoidable though since I had to essentially destroy the old flexible bits to remove them. The adhesive was too strong to prevent me from destroying. I believe they used this different type of tubing to reduce the pressure that the copper blocks would place on the processors when the LCS was mounted. I haven't had any issue with the system since its overhaul. I tried to match Apple's decision on all their sealing and capping all ports and hoses.

I do have a fuel switch for both closed loop systems that will allow me to reintroduce more coolant if need be. I believe both systems need a tad bit more coolant but I have not gotten around to adding more since the computer runs fine even under heavy load. I should have ran the pumps for a longer period of time before sealing the system up in order to get an accurat liquid observation. When I closed the system up, I believe there was still a bit of lingering air in the system that I was not able to see.

I too had one CPU running warmer than the other. The upper CPU was lower in coolant, I believe, when I removed the system. As far as what may be causing a higher temp., the #1 concern is low coolant, in a far second is debris/gunk clogging the system.

Chris323i

Thanks for the information

I'm going to give this some more thought

With full load at highest performance cpu temps are 49,49,60,64

At reduced mode they are 38, 37,42, 42

So it may not be a real issue just yet

Either way a coolant change is due.

Don't think its low as I cant here any swooshing around

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.

You would be backwards on those facts.

The duel pump units came out AFTER the single pump units. The duel pump units were deemed to be far more reliable than the single pumps.

Patrick 01 wrote:

Either way a coolant change is due.

Don't think its low as I cant here any swooshing around

On your duel pump LCS system, you won't hear swooshing sound when the coolant becomes low. This is because the pumps have a VC (volume compensation) feature that compensates for changes in coolant volume. The temperature and fan speeds will be your only indication of low coolant. Keep a close eye on them. Download iStat Pro widget if you don't already have it. That way you can monitor temps, fan and pump speeds.

G5Lover