This last weekend, my Groco MSD developed a leak between the
pump assembly and the attached flange that abuts to the joker valve housing. The
head had very little pressure and was spraying nasty effluent on the floor. It was an obvious stress crack caused by time and design. Since replacing the
head wasn't an option because of our immediate plans, I purchased some JB
Water Weld. After removing the
pump assembly, I cleaned the crack with soap and
water, allowed it to dry, and then slightly ground out the crack with my Dremel. I then sanded the area with 80 grit and cleaned several times with Acetone. I mixed the two part
epoxy until it reached an even color, rolled it into a noodle shape and pressed it into the crack. I then sealed the inside of the flange that connects to the joker valve and reassembled everything. When I reattached the pump housing to the joker valve ring, the flange on the pump body reset into its original position creating a small void between the putty and the pump housing. I rolled another noodle of putty and sealed it again. The JB Weld kicks in about 15 minutes and cures hard in about an hour. There was perfect adhesion to the polycarbonate surface and the head has performed flawlessly since the
repair. I highly recommend this product as a "must have" in your tool kit along with the highly useful JB Weld for Metal. One further note: when doing a
repair that requires the mating of two surfaces, the following video is also very helpful. Good luck and good sailing.
James Brown - Get It Together Apollo 1968 - YouTube
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