#7 piston/rod swap from the bottom
Thread Starter
Racer
Joined: May 2012
Posts: 257
Likes: 12
From: las vegas nevada
#7 piston/rod swap from the bottom
Is it possible for me to swap out my #7 piston and rod from the bottom of the car without removing the engine? I broke a valve spring on #7 intake, and I have read up on removing the entire oil pan, both upper and lower. From there, can I take the cap off #7 rod, and then use a block of wood or something to push the #7 piston and rod out the top? The piston did not shatter, its circumference is intact with the valve stuck in the center. I think the sleeve is OK because the piston is still intact and it happened at idle. When I tried to restart it, that's when the valve broke and got stuck in the piston. Thanks for any advice.
Tech Contributor
Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Your not removing the piston from the bottom!! Trust me. Even if you could, how would you get it back in??
Got to pull the pan AND the heads to remove a piston. The pan to remove the connecting rod bolts and the head to push out the piston.
EDIT: WOOPS,,, I thought you wanted to remove the piston OUT of the bottom.
As lionelhuts stated correctly,, its easily accomplished.
BC
Got to pull the pan AND the heads to remove a piston. The pan to remove the connecting rod bolts and the head to push out the piston.
EDIT: WOOPS,,, I thought you wanted to remove the piston OUT of the bottom.
As lionelhuts stated correctly,, its easily accomplished.
BC
Last edited by Bill Curlee; Sep 6, 2012 at 11:57 PM.
Pro
Joined: Sep 2009
Posts: 671
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From: Tulsa OK
As you will most likely be replacing at lease the one where the valve broke, it might be a good time to upgrade both heads. Also, if you plan on reusing the rod, be sure to check the big end for twist by bolting the cap to the rod and torquing the bolts. When a piston impales itself on a valve, there is serious force involved that can twist the rod across the big end. This is very hard to see but will result in a sound much like a twisted rod insert when the twisted rod slaps into the adjoining rod. Ask me how I know. 
Okie
Pro
Joined: Nov 2018
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Valve seats are one piece. It isn't possible for the seat to just drop into the combustion chamber, it would get caught on the valve first.
Oh, it be possible. The dodge hemi engines are very well known for dropping the valve seats on to the pistons and destroying the engine
Oh, it be possible. The dodge hemi engines are very well known for dropping the valve seats on to the pistons and destroying the engine
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Valve Seats are very hard and brittle. Once they dislodge, they can easily split into pieces and damage the cylinder. Just like a piston ring. Its very easy to pull it to open it too far and snap it.
BC
BC
Race Director
Joined: Oct 2004
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Last edited by grinder11; Jul 8, 2023 at 07:14 PM.
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Melting Slicks
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Maybe dates don't show prominently on mobile devices? Seems to happen frequently on this forum.
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,668
Fixed that for you @grinder11 This thread is over a decade old.
Maybe dates don't show prominently on mobile devices? Seems to happen frequently on this forum.
Maybe dates don't show prominently on mobile devices? Seems to happen frequently on this forum.
My error. I was just following the stampede over the cliff!!
