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Re: Piston Rings
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Posted by Std cut the ridge... on March 19, 2000 at 15:20:23 from (167.142.25.213):
In Reply to: Piston Rings posted by MoosieDog on March 19, 2000 at 13:01:58:
MoosieDog- Sir, it is possible to get lucky on one of these jobs. Think positive, but remember there are many reasons for the piston & sleeve & ring kits being so common. Run a piston down, then drag your fingernail up the cylinder wall. If you feel any obstructon at the top, by the "ridge", use the ridge cutter before you pull the pistons. If you didn't feel any ridge use the ridge cutter anyway... If you got the pistons out already, use the ridge cutter anyway... The top ring will have a sharp edge and the old ridge is worn to a radius that matched the old top ring. The new ring jamming into the radius can give a rapid disaster... If you didn't already screw something up while taking the old out and putting the new back in. Yes, 'tis very important to cut that ridge out and make a straight upper cylinder wall! Stick the oil pan back up loosely with a bolt at each corner. Then, use the deglaze hone per the ring mfg instructions. No instructions? Give the cylinder walls a "satin finish", with the swirl lines about 15 degrees inclined. Give each bore a real good flush and scrub with kerosene and a stool brush. Give all internal parts splashed while running the hone a good rinse with clean kerosene. Drain the pan and remove, then give it a good scrubbing. Use a ringless piston to push each new ring half way down the bore it'll be installed in. Check the end gap. Very rarely, but once in a while, a ring will be a bit big for the hole and the ends need to be filed to give mfg spec gap. The ring expands when hot and the gap diminishes. Hence, if the gap is to small when cold you can get a rapid disaster when they warm up and expand. Clean the carbon out of the bottom of the ring grooves in the pistons. As the rings wore away it is common that the space behind fills up with carbon. If not removed, that crud build up prevents the new ring from compressing into the groove properly and rapid failure happens. If in doubt, go down to your public library and do some reading in an old Motors or Chiltons repair manual, about all this. Good luck, IHank
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