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  #1  
Old 11-20-2011, 09:49 AM
mcasdorph mcasdorph is offline
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Default Question about Pistons and Purchasing!

What information do you need to know when purchasing pistons, I read you can change pistons without boring as long as the walls are in good shape and then hone them, my question is the size, what are the specs I need to know to buy standard size pistons? I see these specs on advance's website talking about different dimensions, or could you just take numbers off one of the old pistons?
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Old 11-20-2011, 10:34 AM
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CJ.2007Ram CJ.2007Ram is offline
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What its the reason you want to purchase new pistons? If you are just looking to freshen things up a bit it would be much cheaper to replace your rings. If you are looking to completely overhaul the engine I would recommend checking each of your cylinders for wear then bore accordingly. If you decide to bore it out and you want stock compression just look for pistons that are stock compression, stock wrist pin location but they will have to be oversized by how much you bore it, typically 0.030 over.
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Old 11-20-2011, 11:16 AM
mcasdorph mcasdorph is offline
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Quote:
Originally Posted by CJ.2007Ram View Post
What its the reason you want to purchase new pistons? If you are just looking to freshen things up a bit it would be much cheaper to replace your rings. If you are looking to completely overhaul the engine I would recommend checking each of your cylinders for wear then bore accordingly. If you decide to bore it out and you want stock compression just look for pistons that are stock compression, stock wrist pin location but they will have to be oversized by how much you bore it, typically 0.030 over.
One of the pistons shattered while my sister was driving it, not sure why, I haven't taken the head off to be able to get a good look, I had the oil pan off because there were some dents in it, I found the oil pump and parts of a piston, I thought about rebuilding it all together, but I figured if the wall's are good enough I would just replace all the pistons and rings. Looking from underneath it looked like it was cylinder 7. I had a little smoke coming from the tailpipe when it was running so I checked the plugs and sure enough on cylinder 8 there was some oil on the plug so I knew it was likely the rings, more than likely I'll know whether I can get by without boring once I take the head off and check 7.

Haynes manual says 5.9 has 4.00" Bore and 3.58" Stroke
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Old 11-20-2011, 12:26 PM
Gen1dak Gen1dak is offline
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A shattered piston? This is unheard of in a stocker, especially in this age of built-in electronic rev limited engines. You need to pull this engine down. Anything is possible (maybe a casting flaw in the piston, one in a million), but I'd suspect a pre-disposing factor to have damaged the piston. Also, you're almost certain to have cylinder wall damage requiring re-bore at a minimum. If it's just some piston skirt damage, you might get lucky, but with busted parts like that you need to pull it down.
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Old 11-20-2011, 12:35 PM
mcasdorph mcasdorph is offline
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Quote:
Originally Posted by Gen1dak View Post
A shattered piston? This is unheard of in a stocker, especially in this age of built-in electronic rev limited engines. You need to pull this engine down. Anything is possible (maybe a casting flaw in the piston, one in a million), but I'd suspect a pre-disposing factor to have damaged the piston. Also, you're almost certain to have cylinder wall damage requiring re-bore at a minimum. If it's just some piston skirt damage, you might get lucky, but with busted parts like that you need to pull it down.
If its not to cold or raining tomorrow, I might take it apart to have a better look, will post some pictures as well.

EDIT: Actually, I already have a photo from below, will get a better one later.
http://imageshack.us/photo/my-images/525/1001065y.jpg/

Last edited by mcasdorph; 11-20-2011 at 12:40 PM. Reason: added photo
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Old 11-21-2011, 12:45 AM
Screamintrashcan Screamintrashcan is offline
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Yeah, I agree w/gendak, 100 percent head gotta come off, then the whole deal could be as simple as going to a junkyard and pulling a piston and rod and caps, or pulling and swapping the motor. If you go the cheap route, at least measure and get the journal clearance correct...
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Old 11-21-2011, 01:08 PM
mcasdorph mcasdorph is offline
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2 new photos underneath, looks as if it got filed and jerked the rod and pin and bottom half of piston off, well now I know it will need bored. But with the price of pistons and rings its going to run as much as a used motor :S


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Old 11-24-2011, 02:12 AM
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your looking at a complete overhaul on that motor. who knows where any of the smaller piston remains ended up. oil pump, crank & cam bearings, valves and head damage.

if your not looking to make upgrades then a reman might be your best bet (warranty)
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