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| Stuck piston pin https://slantsix.org/forum/viewtopic.php?t=24312 |
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| Author: | marc426 [ Thu Aug 02, 2007 2:38 pm ] |
| Post subject: | Stuck piston pin |
Hello everyone, When I dismantled my engine, I discovered that one my piston / rod assemblies was pretty stuck. It doesn't really rotate. 1 or 2 other piston/rod assemblies were also a bit hard to rotate. Is that normal? Is this a sign of a previous failure? Which one? What can I do to cure it? Remove it, tur it down a bit and put it back? Anyway, I now know why my engine was so hard to turn even with the camshaft and head cylinder removed!!! The crankshaft rotates really good without this sucker. Thanks for your help. Marc |
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| Author: | Joshie225 [ Thu Aug 02, 2007 3:29 pm ] |
| Post subject: | |
It's not uncommon for a 225 to have tight piston pins. You'll need to take the piston and rod assemblies to a machine shop where they can press out the pins and hone the pistons for the correct clearance. |
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| Author: | Doc [ Thu Aug 02, 2007 4:00 pm ] |
| Post subject: | |
There are some piston pin oiling tips on page 5 of this message thread: DD http://www.slantsix.org/forum/viewtopic ... c&start=60 |
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| Author: | marc426 [ Fri Aug 03, 2007 2:01 am ] |
| Post subject: | |
Piston oiling tip is great! I like these low buck great results tips though this one seems a bit too difficult for me, don't have so small drill bits anyway... I have access to a press, do I have to heat something (and how much?) before trying topush the pins? What are the risks involved in this operation? Thanks, Marc |
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| Author: | Doc [ Fri Aug 03, 2007 8:49 am ] |
| Post subject: | |
Removing pressed-in piston pins can be tricky, you need to support the piston around the pin area or you knock the piston out-of-round or cave-in the pin bore. Most machine shops have the proper fixtures to do this job so you may want them to dis-assemble the sticky pin piston assemblies. DD |
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| Author: | slantzilla [ Fri Aug 03, 2007 10:15 am ] |
| Post subject: | |
Quote:
Most machine shops have the proper fixtures to do this job so you may want them to dis-assemble the sticky pin piston assemblies.
I would have them do it when I was getting the rods resized anyway, and a new set of rod bolts pressed in. DD 
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| Author: | marc426 [ Fri Aug 03, 2007 11:08 am ] |
| Post subject: | |
Quote: Most machine shops have the proper fixtures to do this job so you may want them to dis-assemble the sticky pin piston assemblies.
I'm not so sure. Strangely, they seem to deal more with Peugeot, Citroën and Renault than Mopars...  I will try to put a socket that's not bearing on the piston skirt to get it out. Or maybe machine a piece of metal. What do you think about that? |
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| Author: | Doc [ Fri Aug 03, 2007 11:13 am ] |
| Post subject: | |
Yes, the fixture supports the area around the pin bore while you press on the pin. Do you have (or can get) a "junk" assembly to set-up and practice on? (a good idea) DD |
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