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#1
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383 Question
Does anyone know proper way to install pistons onto rods, do you have to heat rods to get pin through, or is that not a good idea? I have heard both ways no heat, verses heat. I was told if not heated can squash piston slightly and make the piston bind on pin. My info comes from veteran engine builder of 20 yrs but I would like more opinions, Thanks for any help.
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#2
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Yes, you should heat them. There is a special little oven made just for that job. Don't know much about it though, all my engines have floating pins.
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#3
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I put the pistons in an old oven for a couple hours at 450
and the pins i packed in dry ice overnight Then you should be able to press them in with out damaging the piston. If in doubt, any machine shop can fit them for you reasonably |
#4
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My problem is the guy I had do it , heated just the end of rod looks like with a torch, as they have a tint of blue on them is that going to weeken them? He says he has done thousands of rods this way and never had a problem.
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#5
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Sorry if this sounds stupid but
Why would he heat the rods? the pins rotate in the rod and press fit in the piston The rod has the wrist pin bushings, not the piston. I think he screwed up, and he shouldnt be heating the rods enough to turn them blue in any case Parts heated to press fit should be heated gently, not to glowing red. Id seriously make him replace your rods |
#6
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hello, the proper procedure for press pins is: heat the pin end of the rod and slip the pin through the piston and rod end before it cools. on a B&RB mopar motors, the pin is held in the rod, not the piston. heating the rod end doesn't hurt the rod. the factory does it that way. the pin only rotates in full floating rods, which have a bushing, like 340/273/318 mopars. the pin is held with pin locks in the piston. end of lesson,
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#7
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As stated above heating the rods is the way to assemble press fit rods. wiesshund it sounds as though your pistons were not pin fit if you had to heat the piston to get the pin through.
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#8
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If you look at factory installed rods, you'll see no evidence of heat where the pins are pressed. The rod heaters in current use turn the small end blue.
I'm of the opinion that they were originally pressed in at room temperature with special press fit lube. That's the way I've been doing it for 40+ years. |
#9
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My buddy has been useing an old deep fryer with engine oil for years to heat them up, has never had a problem
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#10
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ok i confused my rod/piston types
BUT i still dont think turning the rods blue is a good thing in that case id put the rods in the oven not the pistons Id never turn them blue |
#11
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well sounds like there is alot of opinions out there, i appreciate all the info. like i said my guy states he has always heated small end, small end has a tint of blue. but i know he has been doing this for years and i dont no of anyone that has had problems it just raised some concerns. i opp to leave them as they are, as he stands behind it. thanks to all for inputs..
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#12
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An electric bearing heater will also properly heat the rod ends
and still not turn them blue. Either that or drop the pins in liquid nitrogen. I mean, we are talking the smallest end of one of the highest stressed engine parts. I wouldnt want to do anything to weaken it, such as anealing it. When it breaks there, something usually exits the block or has a lunchfest on the bore, not to mention maybe coming right up through the piston |
#13
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Quote:
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#14
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it will shrink the pins
it wont make them shatter, some press fit parts acctualy use that method. Probably not on our cars but |
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