I bought a 6.2 from the gov. I got it home and tore into to see if there were any big problems. The only thing I found was #5 glow plug broke off and the piston top is all dinged up. Should I replace this piston or all of the pistons? The engine has had a rebuild from the looks of the rods and cylinder bores still have hone marks. So if i need to change the pistons out and i did not do the rebuild how do i tell the size the pistons are? The part # on the piston does not pull up the size. would a machine shop be able help?

how dinged up is it? if theres maybe a small scar in it i wouldnt think that would cause harm. cant you just order in a 6.2L diesel piston?

https://publish.comcast.net/modal_windows/file_details/kHXkFBdrxw12gsBMovk4HhVBPYpTHRBYShWBcgz-anHfGYldvdCqYJGgdwaVOHOZgJCE1bteWif6z0HvRBGbnzFwvY CZX2IYT8eyKTV3Mw0,pwpimages-%5E-100_2682.JPG,pictures,1117809,1257081787,JPEG%20im age,Yes,all/ here is what it looks like.

http://scraporchard.com/forum/images/smilies/1974_eating_popcorn.gif

my darn computer wont show the picture.

I 'am having no luck loading a picture. will have try later https://publish.comcast.net/modal_windows/file_details/kHXkFBdrxw12gsBMovk4HhVBPYpTHRBYShWBcgz-anHfGYldvdCqYJGgdwaVOHOZgJCE1bteWif6z0HvRBGbnzFwvY CZX2IYT8eyKTV3Mw0,pwpimages-%5E-100_2682.JPG,pictures,1117809,1257081787,JPEG%20im age,Yes,all/

https://publish.comcast.net/tpath/pR0M7EQs4F-6JMiLcfJ7LSSTB-PiA1B33aBRra5Xy5SGKTNwmYys33aY2gUs1N9QMIfXuSGWWlxJ rx9-N85updB33tbD_IHgWHkvmJMQT34/

id say, unless the piston is cracked. leave it alone. but the picture is so small i cant really tell.

put pics on a host site like photobucket..

stock pistons have letter sizes stamped on them a,b,c.d. most oversizes have numbers like .50, .75 etc

i was looking for some kind of markings. thank you for the information.

i found a C on the top of the piston. So that means a stock piston right?

it means its CCEEN better days :p:

yes, stock size, not overbored

thank you for the help. Now i just have to make up my mind if i should replace it. Then put the engine back together.

https://publish.comcast.net/tpath/pR0M7EQs4F-6JMiLcfJ7LSSTB-PiA1B33aBRra5Xy5SGKTNwmYys33aY2gUs1N9QMIfXuSGWWlxJ rx9-N85updB33tbD_IHgWHkvmJMQT34/

Looks good from here!:eyecrazy:

Would not replace it unless you see a visible crack in it, this is a common thing in IDI motors..... :D

One more result of lack of glow plug maintenance..... should be taken out and verified twice yearly (spring and fall)....:)