Removing Piston Pins
Thread Starter
|
Senior User
Joined: May 2019
Posts: 237
Likes: 0
From: Pasco, WA
Removing Piston Pins
I'm getting ready to pull my 300 I 6. Last year I rebuilt the engine with new hyper pistons, but took a short cut and didn't have the crank grinded due to money. So now I have a crank in near perfect original condition, and a set of balanced rods to go with it. I want to use the pistons and have to remove them without damaging them. I don't want to use a press even though they would probably be okay. These are some of the most stubborn wrist pins I have ever saw on anything. I was thinking of packing the pin with shaved dry ice, then heating the rod and I'm hoping they will slide out without force, then installing the same way. Has anyone used this method? Or is there another way?
Moderator
Joined: Jan 2001
Posts: 56,983
Likes: 2,736
From: Virginia
That's going to be hard to do. I have done it before, but there was no way of doing it without using a press. I made a custom cradle to support the piston evenly while I pressed the pin. It worked ok.
Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
Swapping pistons means you are going to need to balance it anyway. So why not just pay to have them swapped at the machine shop before they balance the rotating assembly? You want to use a hot plate for this work and not a torch. Just need to gain 300 degrees which will allow them to essentially fall out.
Thread Starter
|
Senior User
Joined: May 2019
Posts: 237
Likes: 0
From: Pasco, WA
I'm using the same pistons.The rods are balanced. The crank is factory balanced. This isn't a race engine, lol. A hot plate will only heat the piston, the pin is pressed into the rod not the piston, although I wish it were the other way around. I don't like the idea of an aluminum piston being rotated on the pin such as in these engines, but they run for a long time anyway, so I guess I'm stuck with it.
Moderator
Joined: Jan 2001
Posts: 56,983
Likes: 2,736
From: Virginia
He is just saying don't get excited because you have a set of balanced rods and a crank, if the pistons weren't there during the balancing then it's not going to be balanced. But like you said this is not a race engine.
Thread
Thread Starter
Forum
Replies
Last Post
85bobtail
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
4
Mar 30, 2012 07:48 AM
85bobtail
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
5
Mar 19, 2012 04:10 PM
PyroBob
Performance & General Engine Building
5
Apr 6, 2006 05:04 PM
