Power Mac G5 Quad LCS Repair

Thanks for that but as I said super glue didn't work at all, which going by what you said about it's solubility in water is a good thing! The port is made from a very strange plastic. When you drop it onto a solid surface it rings like metal. It reminds me of the old bakolite/paxolin used in vintage electronics. I'm presently Googling/contacting glue manufacturers so I'll see where that takes me. After recently installing a new logic board I'm hanged if I'm going to let this little problem force me to disassemble the quad and sell it for spares!

Thanks for that information Heikki. Unfortunately before reading it I'd purchased some Plastic Padding "Super Steel" 2 part epoxy. This stuff is supposed to be capable of repairing central heating radiators and is used in industry for making prototypes. I repaired the port on Friday and to be honest it appeared to do a good job. I have just spent the weekend filling the LCS/bleeding it and running the pump to make sure there were no issues and the bloody thing has broken again. Thank God I hadn't fitted it!!! This repair is costing a fortune in adhesives-surely if we can put a man on the moon we can come up with an adhesive that works on this type of plastic?? And I had gone from a 50:50 water/anti-freeze mix to 80:20 in case the anti-freeze was the culprit. Have you any idea who originally manufactured these covers, as a new one has to be the way to go? Thanks. Nigel

Thanks for all your input Heikki. I contacted Huntsman who are the manufacturers of Araldite and surprisingly got a very detailed reply from their technical department. To summarise they suspected the failure was due to the epoxy not bonding with the surface due to poor surface preparation, that Araldite is not affected by anti-freeze and that after preparing the piece (i.e. sanding down and cleaning with acetone), I should apply it in layers. I did all the above last night and today refilled the system. It seemed fine so I installed the c.p.u.s, threw it all back together (getting quite profficient at this now!!) and switched on. Idle temps were within 2 degrees of each other at 35. So I went into energy saver, set the processors to max and fired up folding. Temps rose to 50 and were stable and the machine quiet. Rebooted and ran thermal calibration which passed. Started a full diagnostic and had a quick look at the repaired port.****ing thing was hanging off!! Whipped out the mains lead and tilted the case towards me. For once I had luck on my side-there was a large bubble at the port which prevented any fluid coming out. So back to square one. I don't care what Huntsman says-the Araldite had gone from being rock hard to soft and pliable and had absorbed the blue colour from the coolant. I'll contact the guy on macrumors and fingers crossed he's still got it. Failing that I've come up with a new repair strategy-fibre glass. I've used this to patch up holes in a rusty car and it was very effective. I think cutting the matting into fine strips and wrapping them around the base of the pipe might do the trick. I certainly hope so! ( I'm at the stage now where I've threatened the machine that if my next repair doesn't work it's getting Hackintoshed :-) )Nige