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| I'm stumped....how does the connecting rod pin come out ? https://www.slantsix.org/forum/viewtopic.php?t=64785 |
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| Author: | blue62val [ Tue Apr 21, 2020 12:06 am ] | ||
| Post subject: | I'm stumped....how does the connecting rod pin come out ? | ||
G'day guys, well.....the pistons from my 61 Valiant 225 have me stumped. How the heck do I get the pin out ? There doesn't seem to be any circlip holding it in - what am I missing ? Peter
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| Author: | emsvitil [ Tue Apr 21, 2020 12:15 am ] |
| Post subject: | Re: I'm stumped....how does the connecting rod pin come out ? |
A hydraulic press. 
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| Author: | blue62val [ Tue Apr 21, 2020 12:16 am ] |
| Post subject: | Re: I'm stumped....how does the connecting rod pin come out ? |
Quote: A hydraulic press.
Seriously ??So I'm better off buying new rods ? |
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| Author: | Rob Simmons [ Tue Apr 21, 2020 5:23 am ] |
| Post subject: | Re: I'm stumped....how does the connecting rod pin come out ? |
They are a press fit. Machine shops have “rod ovens” to heat the rod up so it expands, allowing the pin to slide in. Once it cools it basically clamps it in place. |
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| Author: | ProCycle [ Tue Apr 21, 2020 5:35 am ] |
| Post subject: | Re: I'm stumped....how does the connecting rod pin come out ? |
Quote: G'day guys,
The pins press out but when they are installed they are a 'shrink fit'. The small ends of the rods are heated, the pins are slipped into place and the rod cools and contracts around the pin. This was a pretty common way to retain the pins 60 years ago.well.....the pistons from my 61 Valiant 225 have me stumped. How the heck do I get the pin out ? There doesn't seem to be any circlip holding it in - what am I missing ? Peter You really need to be working from a service manual which will explain this kind of thing. |
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| Author: | slantzilla [ Tue Apr 21, 2020 11:37 am ] |
| Post subject: | Re: I'm stumped....how does the connecting rod pin come out ? |
Take them to a good machine shop. Have them put in new bolts, resize the rods, and install your new pistons. Piece of cake.
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| Author: | blue62val [ Tue Apr 21, 2020 7:27 pm ] |
| Post subject: | Re: I'm stumped....how does the connecting rod pin come out ? |
Quote: Take them to a good machine shop. Have them put in new bolts, resize the rods, and install your new pistons. Piece of cake.
Thanks guys for the help. I am still learning with engine stuff, and have only done pistons, rings etc in an old 383 I used to own. Pistons in that were easy to change over.....I figured they were all the same. I actually have an original manual, which unfortunately is crumbling away, and i didn't even consider looking at the darn thing - not the brightest bulb in the shed. Saw my machinist today and took my crank and camshaft to him for linishing and cleaning. Straight away he said "Oh yeah.....you need to press those out and heat them to get 'em in". Thanks again, Peter |
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| Author: | GregCon [ Wed Apr 22, 2020 10:44 am ] |
| Post subject: | Re: I'm stumped....how does the connecting rod pin come out ? |
It's certainly better to heat the rods to install the new pins....but plenty have been pressed back 'cold' with acceptable results. |
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