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Unread 09-15-2013, 03:57 PM   #1
Jimidude87
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1988 YJ Wrangler 
 
Join Date: Aug 2011
Location: spring hill, florida
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attaching piston to connecting rod

Hey guys i just had a quick question...I recently started rebuilding my motor and while i had it apart i noticed one of the pistons was cracked...i bought a new one and was told i could use the old connecting rod...i have an arbor press and from what i have researched that's all i need to mate the two...now I'm hearing that i need to take it to a machine shop so they can heat something while they connect them...is this true or can i just do it myself with the arbor press?

Thanks guys

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Unread 09-15-2013, 04:03 PM   #2
deathtrap
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The small end of the rod needs to be heated. I would take it to a machine shop, shouldn't cost much to do one piston.
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Unread 09-15-2013, 04:36 PM   #3
snail81
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if you can press it out yourself you can do it. they heat the rod to expand it to press it in and out easier
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Unread 09-15-2013, 04:46 PM   #4
jsawduste
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Quote:
Originally Posted by snail81 View Post
if you can press it out yourself you can do it. they heat the rod to expand it to press it in and out easier
^^^^this^^^^
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Unread 09-15-2013, 05:38 PM   #5
Jimidude87
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Alright so the heating thing is just to make it easier to install but is not necessary right?
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Unread 09-15-2013, 07:08 PM   #6
snail81
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Quote:
Originally Posted by Jimidude87
Alright so the heating thing is just to make it easier to install but is not necessary right?
Correct.
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Unread 09-15-2013, 07:36 PM   #7
jsawduste
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^^^^this^^^^
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Unread 09-16-2013, 04:48 AM   #8
Jimidude87
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You guys have any idea of how much harder it will be without the heating?
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Unread 09-16-2013, 05:31 PM   #9
snail81
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1988 YJ Wrangler 
 
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i dont think the arbor press will do it unless you heat the rod and maybe freeze the piston pin. when you go to put them together you better be quick about it. I used this method when installing bearings when I rebuilt my 8.8. It works great.
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Unread 09-16-2013, 06:48 PM   #10
Jeepsr4me
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Heat the rod end or u risk cracking piston also freeze pin with dry ice and it should drop straight in.
No need heating it to take out but helps. Cheap propane torch works great.
http://m.youtube.com/watch?v=nkChxaa...%3DnkChxaaKpYk
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Unread 09-16-2013, 09:15 PM   #11
deathtrap
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Quote:
Originally Posted by Jeepsr4me View Post
Heat the rod end or u risk cracking piston also freeze pin with dry ice and it should drop straight in.
No need heating it to take out but helps. Cheap propane torch works great.
http://m.youtube.com/watch?v=nkChxaa...%3DnkChxaaKpYk
Yep, Why risk breaking the new piston to save 10 bucks?
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Unread 09-17-2013, 12:31 AM   #12
timatoe
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Quote:
Originally Posted by deathtrap View Post
Yep, Why risk breaking the new piston to save 10 bucks?
Exactly. I just rebuilt the 350 in my little motorhome, $6 ea at the machine shop. Way cheaper than new rods or pistons if I screw it up.
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