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View Full Version : 3 melted pistons , still good ?


lancer117
06-24-2007, 06:47 PM
ok well i found out why i have a blown head gasket . took the head off today and this is what i found . there are 3 pistons that a melted a little , but b4 i pulled the head i did a compression test and i had 150 across the board . so i'am guessing i did not mess them up where i cant run them , would like to know if you guys think they will be ok . from what i can see down the sides of the piston they look ok . just looks like the top took a beating . the motor is a 2.5 with 3000 miles on it with some wisco pistons . aslo look at the head it pretty beat up too . you think that can be welded and milled flat again or just replace it ?thanks

http://i103.photobucket.com/albums/m130/ridins10s/uploads574Small.jpg
http://i103.photobucket.com/albums/m130/ridins10s/uploads573Small.jpg
http://i103.photobucket.com/albums/m130/ridins10s/uploads572Small.jpg
http://i103.photobucket.com/albums/m130/ridins10s/uploads575Small.jpg
http://i103.photobucket.com/albums/m130/ridins10s/uploads576Small.jpg
http://i103.photobucket.com/albums/m130/ridins10s/uploads579Small.jpg
shelbyplaya
06-24-2007, 10:55 PM
i wouldent re-use the pistons, they are gone. the head can be cleaned up
overlordsshadow
06-24-2007, 11:13 PM
i'm undecided. They may still have compression but once u get it going again they could heat up again and score the block up.
MiniMoparKing
06-25-2007, 01:47 PM
man, how did you manage to nuke a 3,000 mile, built-up engine?
overlordsshadow
06-25-2007, 02:08 PM
I did it on a 1000 km engine lol. Cept mine was dead for compression after.
turbovanmanČ
06-25-2007, 03:59 PM
There is nothing wrong with those pistons, some slight heat issues but they will still work perfectly. The head is another matter, I did the exact same thing with my JE's, leaned out big time but rerung it, new head and good as new.
If you dont' want to reuse those pistons, I'll buy them cheap, :nod: :lol:
SL#189
06-25-2007, 05:04 PM
That head definitely looks a bit "iffy" at the fire-ring...
lancer117
06-25-2007, 05:32 PM
That head definitely looks a bit "iffy" at the fire-ring...

yeah i know , i'am just going to grab one off a member of TD . good thing it was not a ported one :thumb: . i hope all goes well :o
turbovanmanČ
06-25-2007, 06:27 PM
Find out why you leaned out so badly, that was at least 1700 egt's I would guess.
lancer117
06-26-2007, 12:58 AM
yeah , i think theres some thing wrong with my fuel system
MiniMoparKing
06-26-2007, 01:08 AM
did you have any way of monitoring your air/fuel or EGT's? If not, I would buy and install one before you get that engine running again.
turbovanmanČ
06-26-2007, 02:06 AM
yeah , i think theres some thing wrong with my fuel system

Ya think? :banghead: :p

If you don't have any guages, nows a good time to get some.
Spraynlog
06-26-2007, 08:14 AM
With what Simon said, reuse the pistons. Get new rings, get a ball hone and clean up the cylinder walls. Look carefully at the top of the bores, you may find melted aluminum from the head stuck there, remove it with emery cloth, or it may chip off with a knife blade (carefully)

I melted some stock cast pistons WAY worse than that! :nod: After fresh pistons and rings and a ball hone job, it is running fine! 1000 miles since it had an oil change, and has not used a drop.
lancer117
06-26-2007, 03:37 PM
cool thanks guys , i will let u know whats going on as soon as i get a head . hopefully all goes well . and this baby will be back on the road