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Posted: 10/14/2005 5:01:47 AM EDT
| Hi, how do I remove the gas piston off of my Romanian SAR1? Thanks for any assistance! |
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1) Locate the cross pin in the carrier. You should see the outline or an indent about 1/2" for the rear of the piston. 2) Punch the center of the pin. 3) Drill the pin out with a 3 mm. or 1/8" Cobalt drill. A drill press in extremley helpful. Use plenty of oil, a low speed setting and just enough pressure to get some chips. If you can't get all the way through, try knocking it out with a punch and hammer. 4) Unscrew the piston. You may need a vise or pair of pliers to get it past where the old pin was. To replace: 1) Screw in the new piston, leaving a slight gap, 1/16" or less between the piston shoulder and the front of the carrier. 2) Drill through the piston with the 1/8" drill. 3) Slightly chamfer the hole on both sides of the carrier. 4) Remove the new piston. 5) Drill the 1/8" hole, in the piston only, out the 3/16". 6) Screw back in, lining up the holes by eye. Be sure you gap is still there. 7) Get a peice of 1/8" steel rod and cut about 1/2" longer than the diameter of the carrier. 8) Put it through the hole in the carreir and piston. 9) Lay one side of the pin on a solid base and beat the other side of the pin with a hammer until the chamfer is filled. 10) Grind/file any extra material that pokes out from the carrier to match the original contours. 11) Refinish to your liking. There should be a slight wobble in the piston where it screws into the carrier. If there isn't, try banging lightly on a wood bench top. If it doesn't loosen up, try again. Hope this helps, Mike |
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