Jim Yergin Posted March 28, 2010 Report Posted March 28, 2010 Today I got my block back from the machine shop. Here is cylinder #3 before: And here it is after the re-sleeving: I ended up having three cylinders re-sleeved. I apparently did not install the piston pin clips correctly and the pins "walked" and scored the cylinder walls. That is probably why the #3 piston got destroyed. Hopefully this time I will get it right. Jim Yergin Quote
RobertKB Posted March 28, 2010 Report Posted March 28, 2010 Looks really good, Jim! Isn't it great what a good machine shop can do. I figured your block was a boat anchor but they made it as good as new! Now you can look forward to getting everything back together and your car on the road. From the depth of despair to the heights of exultation!! Quote
Joe Flanagan Posted March 28, 2010 Report Posted March 28, 2010 So does anyone have a picture of a correctly installed cliip? I've forgotten how I did mine. I seem to recall they would only go on one way. Quote
Niel Hoback Posted March 28, 2010 Report Posted March 28, 2010 I recall that they simply snap into the groove. The only reference to the lock rings in the shop manual, that I can find, is to use new lock rings when re-installing pins. Also, it said that if you find the edges of the groove "feathered", or worn, you should use new pistons. Quote
Joe Flanagan Posted March 28, 2010 Report Posted March 28, 2010 That's what I thought. I have new pistons in mine. Can't remember whether I used new clips (rings). Quote
greg g Posted March 28, 2010 Report Posted March 28, 2010 Looks great Jim. Hopefully you will be able to get it back to running condition soon. Quote
Dodgeb4ya Posted March 28, 2010 Report Posted March 28, 2010 So does anyone have a picture of a correctly installed cliip? I've forgotten how I did mine. I seem to recall they would only go on one way. Not much to these MoPar 6 cyl piston clips. Here is a picture of a NOS factory 3-1/4"X.030" piston and clip installed. The factory clip is completely flat. Don't over compress them more than necessay when installing them. Bob Quote
P-12 Tommy Posted March 28, 2010 Report Posted March 28, 2010 Jim, Hopefully you'll get it going soon. Tom Quote
Jim Yergin Posted March 28, 2010 Author Report Posted March 28, 2010 My machinist told me that he thought the clips have two different sides. One side is flat and the other side is rounded. He said the flat side should face the outside of the piston. I checked mine and cannot see any difference in the two sides. He is not a Mopar specialist but is a very good machinist. Maybe he was misinformed. Thanks for the tip about not re-using the clips. I did not know that and given my experience I won't risk not using brand new ones this time. Jim Yergin Quote
Merle Coggins Posted March 28, 2010 Report Posted March 28, 2010 The picture that Bob posted looks like it has round retaining rings. In this case the piston grooves and pins are designed to work with round clips and they are not directionnal. If you have flat clips/snap-rings then they are directional. Snap-rings are stamped out of a sheet of steel. During the stamping process they end up with one side having a square, sharp edge and one side having a more rounded, softer edge. You'll have to look closely as the difference is minimal. The side with the sharper edge should go to the outside as it will grab into the groove better when the pin presses against it. This applies to all snap-rings, with the sharper edge side going in the direction of thrust load. Merle Quote
Bob Riding Posted March 28, 2010 Report Posted March 28, 2010 Today I got my block back from the machine shop. Here is cylinder #3 before: And here it is after the re-sleeving: I ended up having three cylinders re-sleeved. I apparently did not install the piston pin clips correctly and the pins "walked" and scored the cylinder walls. That is probably why the #3 piston got destroyed. Hopefully this time I will get it right. Jim Yergin Jim; I had a problem with the wrist pin on 2 cylinders on my '40 Dodge. I had the engine rebuilt by an expert flathead guy in Fresno. His name was Tex Davis and he had been working on flathead motors since 1946, and actually worked at a Chrysler shop as a mechanic. I used federal Mogal pistons and keepers. Soon after Tex rebuilt it, it developed a tapping noise, and apparently 2 of the keepers had failed. Tex diagnosed the problem and fixed it no charge, because he felt that somehow he hadn't installed them correctly. He passed away last year. Quote
JIPJOBXX Posted March 28, 2010 Report Posted March 28, 2010 So what size did they overbore the cyclinders? Your engine is like mine its almost worth its weight in gold! I had one sleave replaced and I know that was pricey. Anyway looks like your about to put your engine back together again have fun! Quote
Jim Yergin Posted March 29, 2010 Author Report Posted March 29, 2010 So what size did they overbore the cyclinders? Your engine is like mine its almost worth its weight in gold! I had one sleave replaced and I know that was pricey. Anyway looks like your about to put your engine back together again have fun! The cylinders were sleeved with the 20 over sleeves from VPW. Jim Yergin Quote
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