LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Removing piston from rod?

Old Sep 6, 2011 | 01:29 PM
  #1  
raroz28's Avatar
Thread Starter
Registered User
 
Joined: Feb 2005
Posts: 1,326
From: Metro Detroit, MI
Removing piston from rod?

Just got in from the shop where I dropped of my pistons to get new rod bolts installed. They have to remove the pistons obviously, and he said they're going to shatter cause the LT1 pistons are so cheap.

I was not aware that it was such a high probability. I thought if you had good equipment, knowledge and were careful, you can remove them without shattering the piston, although in some cases I know it happens. He said 90% chance they're going to break though.

Am I wrong for worrying?
[autostream]http://autostream.com/camaroz28/?page_type=firebirdplayerthumbnail&framepage=1690& transactionid=1315333749-691417789&posted_by=raroz28_www.camaroz28.com&yout ube_video_id=B4e7PNzbTzY[/autostream]

I'm just a little annoyed because I bought a whole new set of pistons simply because mine had so much carbon on them, now I'm hearing these cherry pistons are going to shatter anyway.
Old Sep 6, 2011 | 02:40 PM
  #2  
raroz28's Avatar
Thread Starter
Registered User
 
Joined: Feb 2005
Posts: 1,326
From: Metro Detroit, MI
Re: Removing piston from rod?

7 came off good, 1 he said changed size by about a thousandth, so I'm going to replace that piston (I have 8 more here).

Pretty cool.
Old Sep 6, 2011 | 04:47 PM
  #3  
Kevin Blown 95 TA's Avatar
Registered User
 
Joined: Oct 2001
Posts: 2,684
Re: Removing piston from rod?

They're probably going to press the old ones off and if they don't have the exact right cradle to set the piston in they might break them (they'll probably get a little galled anyway), but they will put the new ones together differently, probably put the rods in an oven so they can expand the small end and assemble them gently. Not to worry.
Old Sep 6, 2011 | 04:52 PM
  #4  
raroz28's Avatar
Thread Starter
Registered User
 
Joined: Feb 2005
Posts: 1,326
From: Metro Detroit, MI
Re: Removing piston from rod?

Originally Posted by Kevin Blown 95 TA
They're probably going to press the old ones off and if they don't have the exact right cradle to set the piston in they might break them (they'll probably get a little galled anyway), but they will put the new ones together differently, probably put the rods in an oven so they can expand the small end and assemble them gently. Not to worry.
Yeah not so bad. Just costly. It's costing me 260 out the door with ARP rod bolts
110 for reconditioning
30 for piston pin reconditioning
48 for piston r&r
60 for arp rod bolts
Old Sep 6, 2011 | 06:05 PM
  #5  
walt355's Avatar
Registered User
 
Joined: Jun 2003
Posts: 320
From: Kentucky
Re: Removing piston from rod?

We have pressed some on and off, We have atool made and it is still tricky. However a Good machine shop should have a rod heater. It heats the pin end of the rod and the rod slides right in. Its a lot less stress on the rod and piston this way
Old Sep 6, 2011 | 11:45 PM
  #6  
MachinistOne's Avatar
Registered User
 
Joined: May 2004
Posts: 2,001
From: Bay Area, CA
Re: Removing piston from rod?

Originally Posted by walt355
We have pressed some on and off, We have atool made and it is still tricky. However a Good machine shop should have a rod heater. It heats the pin end of the rod and the rod slides right in. Its a lot less stress on the rod and piston this way

Yeah, I don't see how any "professional" shop couldn't.

Also the video posted by the OP shows an old generation of pin removal tooling that stresses the piston when removing the pin and highly increases the likelihood of breaking it, the tooling I used cradles the bottom side of the rod small end and I can with a great level of success press pins out on cast pistons multiple times without the risk of breakage.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
dbusch22
Forced Induction
6
Oct 31, 2016 11:09 AM
drptop70ss
Forced Induction
1
Mar 26, 2015 01:50 AM
carl.froehlich
LT1 Based Engine Tech
6
Mar 13, 2015 12:38 AM
1963SS
Parts For Sale
1
Feb 6, 2015 10:05 AM
Bill'sWS6
Midwest
1
Aug 5, 2002 01:00 PM


Thread Tools
Search this Thread

All times are GMT -5. The time now is 06:56 AM.