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Look at this piston... #1349978 12/12/12 12:13 AM 12/12/12 12:13 AM
Joined: Mar 2005 Posts: 1,630 North Central Florida E eightlitermopar OP top fuel
eightlitermopar OP top fuel E Joined: Mar 2005 Posts: 1,630 North Central Florida	Ok...when is the last time your project went smoothly? I got my rings on the pistons for my 318 and started puting them in. Well....Once they are in, I noticed this. WTH? Sooo....replace the piston? 7499641-piston005.jpg (166 downloads) Mopar or no car

Re: Look at this piston... [Re: eightlitermopar] #1349979 12/12/12 02:46 AM 12/12/12 02:46 AM
Joined: Jan 2011 Posts: 4,785 Utah and Alaska astjp2 master
astjp2 master Joined: Jan 2011 Posts: 4,785 Utah and Alaska	Yes.

Re: Look at this piston... [Re: astjp2] #1349980 12/12/12 04:52 AM 12/12/12 04:52 AM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	Naw,, its only a lil 318.. I am truckless..

Re: Look at this piston... [Re: eightlitermopar] #1349981 12/12/12 05:10 AM 12/12/12 05:10 AM
Joined: Jan 2003 Posts: 3,575 The Netherlands BigBlockMopar master
BigBlockMopar master Joined: Jan 2003 Posts: 3,575 The Netherlands	What kind of piston-installation 'technique' do you use in order to spot this after you installed the piston? I would sand off the sharp edges and plunk it back in. Maybe switch this piston/rod-assembly with another one if the skirt is on the thrustside of the block. BigBlockMopar.com

Re: Look at this piston... [Re: BigBlockMopar] #1349982 12/12/12 08:51 AM 12/12/12 08:51 AM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	Quote: What kind of piston-installation 'technique' do you use in order to spot this after you installed the piston? I would sand off the sharp edges and plunk it back in. Maybe switch this piston/rod-assembly with another one if the skirt is on the thrustside of the block. I think he meant the rings installed onto the piston? at a minimum I'd dress the edges, but honestly, I'd strongly consider replacing. how do you know that whatever blow the piston took to break the skirt, didn't also distort what's left of the skirt, and now the piston is out of round, or has a high spot that will rub in the bore? Photobucket sucks

Re: Look at this piston... [Re: 70Cuda383] #1349983 12/12/12 09:21 AM 12/12/12 09:21 AM
Joined: Mar 2005 Posts: 1,630 North Central Florida E eightlitermopar OP top fuel
eightlitermopar OP top fuel E Joined: Mar 2005 Posts: 1,630 North Central Florida	Sorry for the misunderstanding. I put the new rings on, them put the piston in the block. I honestly can't tell if this is a new or old condition of the piston. I will be replacing it. When the motor was disassembled, there was a lot of carbon. The motor would diesel when shut off (if it was running hot). Could dieseling cause something like this? eight Mopar or no car

Re: Look at this piston... [Re: eightlitermopar] #1349984 12/12/12 09:47 AM 12/12/12 09:47 AM
Joined: Jan 2003 Posts: 7,978 Bethel Ct A AdamR master
AdamR master A Joined: Jan 2003 Posts: 7,978 Bethel Ct	I would think its going to cause an imbalance.

Re: Look at this piston... [Re: 340SHORTY] #1349985 12/12/12 10:13 AM 12/12/12 10:13 AM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: Naw,, its only a lil 318.. I'd run it, NBD.

Re: Look at this piston... [Re: Challenger 1] #1349986 12/12/12 10:24 AM 12/12/12 10:24 AM
Joined: Aug 2010 Posts: 343 S.E.Mich D drew72 enthusiast
drew72 enthusiast D Joined: Aug 2010 Posts: 343 S.E.Mich	You can tell that it's a fresh break. There is no varnish on the broken edge. Usually this happens when somebody isn't thinking and swings the piston by the big end of the rod. Sand smooth and run it.

Re: Look at this piston... [Re: AdamR] #1349987 12/12/12 10:56 AM 12/12/12 10:56 AM
Joined: Jan 2003 Posts: 3,575 The Netherlands BigBlockMopar master
BigBlockMopar master Joined: Jan 2003 Posts: 3,575 The Netherlands	Quote: I would think its going to cause an imbalance. I think you have too high expectations of a factory's balance job. But if one might be worried about an imbalance in a bone stock engine, maybe it's a good idea to break off all the other skirts aswell to get them all the same weight again... BigBlockMopar.com

Re: Look at this piston... [Re: BigBlockMopar] #1349988 12/12/12 11:00 AM 12/12/12 11:00 AM
Joined: Mar 2007 Posts: 9,336 South-Central (Sebring), FL Commando1 master
Commando1 master Joined: Mar 2007 Posts: 9,336 South-Central (Sebring), FL	Quote: What kind of piston-installation 'technique' do you use in order to spot this after you installed the piston? That was my first thought....

Re: Look at this piston... [Re: eightlitermopar] #1349989 12/12/12 11:32 AM 12/12/12 11:32 AM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	I'd think for a driver you could just sand it/clean it and roll. But a 318 piston can't cost that much can it?

Re: Look at this piston... [Re: Mr.Yuck] #1349990 12/12/12 12:37 PM 12/12/12 12:37 PM
Joined: May 2007 Posts: 1,443 Maryland D Dads426 pro stock
Dads426 pro stock D Joined: May 2007 Posts: 1,443 Maryland	I'd check piston to wall clearance. A stock cast piston doesn't like rattling around in a big hole. 2012 422 Allstars NSS Champion 2013 422 Allstars NSS Champion 2014 422 Allstars NSS Champion

Re: Look at this piston... [Re: Dads426] #1349991 12/12/12 01:50 PM 12/12/12 01:50 PM
Joined: Mar 2007 Posts: 12,013 Finally a HUSKER again Moparnut426 I Live Here
Moparnut426 I Live Here Joined: Mar 2007 Posts: 12,013 Finally a HUSKER again	Boy if the piston to wall clearance isnt excessive, deburr it, and run it. surely isnt gonna be a big deal, Heck some newer designed pistons have 1/3rd the skirt that one has anyways.

Re: Look at this piston... [Re: Moparnut426] #1349992 12/12/12 10:48 PM 12/12/12 10:48 PM
Joined: Mar 2005 Posts: 1,630 North Central Florida E eightlitermopar OP top fuel
eightlitermopar OP top fuel E Joined: Mar 2005 Posts: 1,630 North Central Florida	I have no idea how it happened... Maybe it was slightly cocked in the cylinder when I was putting it in? This is the only thing I can think of. This is my first time assembling a complete short block by myself so I know I am not a professional at this point. I priced a new piston at anywhere between $10-20 bucks. This is what I am going to do. eightlitermopar Mopar or no car

Re: Look at this piston... [Re: eightlitermopar] #1349993 12/12/12 11:23 PM 12/12/12 11:23 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: I have no idea how it happened... Maybe it was slightly cocked in the cylinder when I was putting it in? This is the only thing I can think of. This is my first time assembling a complete short block by myself so I know I am not a professional at this point. I priced a new piston at anywhere between $10-20 bucks. This is what I am going to do. eightlitermopar

Re: Look at this piston... [Re: Challenger 1] #1349994 12/12/12 11:53 PM 12/12/12 11:53 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	did you recover the broken piece from inside of the engine and have it accounted for??? I have found some crazy stuff tearing down engines others have built or worked on. found 18 pushrods in a 318 one time. also found a broken piece of piston skirt and no broken pistons. found 8 rusted core plugs inside block when I removed 8 brass core plugs on a 360 tear down. i would be looking for that missing piece before i replaced the piston in that hole.

Re: Look at this piston... [Re: scratchnfotraction] #1349995 12/13/12 07:33 AM 12/13/12 07:33 AM
Joined: Mar 2010 Posts: 1,880 Out in Left Field, NY B bobs66440 top fuel
bobs66440 top fuel B Joined: Mar 2010 Posts: 1,880 Out in Left Field, NY	Quote: i would be looking for that missing piece before i replaced the piston in that hole.

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