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Old 11-02-2009, 08:30 AM
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Press for wrist pins

Hey i am looking at buying a press to do bearings and mostly for installing and removing wrist pins. What do you guys use or recommend? I think i might buy this press: http://www.harborfreight.com/cpi/cta...temnumber=4711

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Old 11-02-2009, 08:41 AM
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Quote:
Originally Posted by zildjian4life218
Hey i am looking at buying a press to do bearings and mostly for installing and removing wrist pins. What do you guys use or recommend? I think i might buy this press: http://www.harborfreight.com/cpi/cta...temnumber=4711
Strongly advise 20 ton. 12 ton minimum. Been there, done that.
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Old 11-02-2009, 08:59 AM
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how much force does it take to remove a wrist pin? that is what this will be mainly used for.
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Old 11-02-2009, 09:01 AM
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Additionally, you'll need to properly support piston/rod assemlies when pressing pins or you can easily damage pistons. Check around for the type of adaptors specifically designed for the job.
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Old 11-02-2009, 09:44 AM
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Trust me I have looked at the adapter setup to use a press, its about 1,100 bucks with out the press, cheaper to just have the machine shop do em.
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Old 11-02-2009, 09:53 AM
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You'll need a rod (coil) oven as well. DON'T press a pin in cold, BTDT.
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Old 11-02-2009, 09:58 AM
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Piston pin press

If I was only disassembling, I would consider doing this my self, and only if I knew I was not going to reuse the pistons.
I also was under the impression that many times the small end of the connecting rod was heated up to make the bore bigger, and then quickly pressed together while still hot.
Are full floating wrist pins an option for your engine?
Unless you are going to assemble several engines, it is probably cheaper to have the machine shop assemble the pistons, and connecting rods
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Old 11-02-2009, 11:13 AM
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i didn't think you had to heat it up. When you heat up the rod usually you can slide the pin in by hand. But i thought you could also do it with a press. I prefer the floating style rod and piston assemblies because they are very easy to put together but i have a set of rods and pistons i want to swap the rods over to a different set of pistons and they are press fit. I am sure i will do this many more times than just this once so i figured i would buy a press. I was gonna make a cradle for the piston out of a block of wood that the piston would rest into with a hole on the other side for the pin to slide out. Heres a quick little idea:
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Old 11-02-2009, 11:39 AM
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A 12 ton press will work fine.
Forget the wood idea though. Also, different pistons will require different adapters. I have a whole rack full and still don't always have the right one.
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Old 11-02-2009, 12:06 PM
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so do i have to heat up the small end of the rod and get a fixture to hold the piston and rod assemblies in place?
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Old 11-02-2009, 12:29 PM
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To remove the pins, no, you do not need to heat them.
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Old 11-02-2009, 12:44 PM
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but to reinstall them? I have a set of "x" rods with arp bolts i want to put on a set of .040 over 350 pistons i have.
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Old 11-02-2009, 12:46 PM
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They can either be pressed or heated and installed, but unless you've done it before, or have someone that has looking over your shoulder, you should just bring them in and have them done. Easy to screw them up either way, by not properly locating it if heated, or by bending/cracking the piston if pressed.
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Old 11-02-2009, 01:57 PM
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I have a neighbor who has a shop at his house and builds some pretty crazy motors. He said he would show me how to press them in.
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Old 11-03-2009, 10:03 AM
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You never want to press them together, only to take them apart. The wrist pins will transfer metal as it passes thru the small end of the rod. And thus on into the piston bores,and as the piston articulates as it is running, the metal transfer will chew up the pin bores..... The cost to do it right is much less than trashing your pistons. I would rather see you take a propane torch and try to heat the rods that way, than to press them together.
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