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Old 03-13-2014, 01:03 PM
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rods off pistons

I have looked at all the threads on how to press fit pistons together. But how do you heat the rod with the piston on to get them apart? Get the rod bore to expand without heating the piston. I just wanted to deburr and polish and put back together Thanks

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Old 03-13-2014, 01:20 PM
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You don't heat them. You use a press to push the pins out, and to re-install
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Old 03-13-2014, 02:47 PM
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Thanks . I didn't think before asking. I will press off old ones, buy new pistons, and heet the rod and insert new pin. When pressed off the piston can get scratched but I am replaceing them with new anyway. I was jus wondering about getting them off and saveing everything without damage for onother time.
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Old 03-13-2014, 02:57 PM
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Before removing the piston pins. Clean the areas if there is any carbon type buildup, with carb cleaner to remove it. Light coat of oil, and then, press them out.
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Old 03-13-2014, 03:07 PM
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You will also need to fab some kind of fixture with a driver and a receiver to avoid rod/pin/piston damage. That's what machine shops are for.. Properly done most pistons/pins can be re-used with no press damage.
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Old 03-13-2014, 08:03 PM
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thanks all, thought they could be reused.
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Old 03-14-2014, 08:37 AM
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Dry ice is sometimes used.
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Old 03-14-2014, 12:26 PM
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Quote:
Originally Posted by 1Gary View Post
Dry ice is sometimes used.
X2, while I don't like pressed pins if it's a must I much prefer cooling the pins on dry ice to heating the rod before pressing the pin.

Bogie
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Old 03-14-2014, 06:01 PM
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I worked at 2 different machine shops that had a small "kiln" or oven that the small end of the rod was placed in until it was a dull red hot.That expands the diameter of the small end.
Then, quickly pulling it out, you stuff into the piston , and drop the pin in. The piston is in a small jig and has a set stop, that stops the pin when dropped in. When it cools off, it contracts and grabs tight to the pin. No pressing involved, works pretty good. Just an alternative method. Just sayin.
Both methods are perfectly acceptable.
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Old 03-17-2014, 08:49 AM
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Dull red being key. This shouldn't affect the temper of the rod. too hot and your screwed. Ive done them around the farm for equipment and such, but if this was my daily driver / hot rod; I'd head to the local vocational school or machine shop. Should be cheap. If the machine shop is full of cars, come back later LOL it may save you a few dollars. Show up with cleaned parts and everything properly marked as well.
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