Hi guys.

I noticed some of my pistons are not completely centered with the connecting rod. I want to try and press the pins a bit further but i dont want to damage the pistons. Has any of you guys have experience pressing these pins? 

The manual shows pictures of a arbor press and some special tools needed to press the pin in or out. I do have a 20 tons press at work. Trying to figure out how to support the piston so that it wont break or gets damaged. Or should i just spend some money and let a professional do it?

I would like to hear your thoughts. 


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Sometimes the building of these rigged tools is more fun than the work you need to do with them. I love it when a problem is solved with off the shelf garage stuff. Great work and keep the pictures coming. 

Just looked through my manual and noticed this picture.

I have never taken a 390/429 apart. Have been taking other engines apart though and in all of them a cradle was the way to go.

Hope I didn't mislead with my first reply and it does look like the problem is sorted. And as always check the "bible" before doing anything:

Hi Anders. 

No you did not mislead me. I was lookin at the same picture in my "bible" but could not find any original tools on e-bay or other fenders. The tools you see on this picture are made by Kent Moore. The company still excists but it seems that they do not make this specific tool anymore. I went and made my own version gheheh:-).

As in your other special tools post. It would be nice to have those vintage tools just layin around in your workplace. Probably wont use them every day, but hey... Some things are just nice to have. 


When I rebuilt my engine in 2012, I took my new pistons and the original connecting rods down to the local machine shop and had them press off the old pistons and press on the new pistons. That machine shop has been pressing pistons on and off for 30+ years and was just one of those things I didn't want to sweat, not to mention I do not have a press or the special fittings they had laying around to press the pins in and out.  To those guys it was as old hat as turning a drum, or tapping out a broken bolt.  I guess my point is if you have an old school machine shop around use it as you would any other tool.  Often an overseas customer will need just the connecting rod and I will run a piston over to the shop and they will press the one off for free.  It is good to have contacts like that! 


I am always trying to find the right poeple for certain jobs. But the classic car busines here in the Netherlands or at least in my living area is not that big. I found a small place near Amsterdam with a guy named Hans he smells like hone oil, looks like a professor and is a bit strange but he does a perfect job. The guy doesnt advertise or has a website. Either you know him or you dont gheheh:-). As i continue fixing my car i noticed that knowing the right people really makes things easier. The most help i get is trough this website. Really apreciate it.



Searched for J-8390 just for fun and found this:



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