Dropped valve

[ChevyWoods89]

Recently my truck ran hot and it also ended up dropping a valve. I need to get this truck on the road ASAP and was wondering what you all think about me just replacing the piston or just slapping the heads on and going? I'd hate to rebuild the motor if it's gonna be okay with a simple fix

Thanks, rickey

[URL=http://s211.photobucket.com/user/KingRichard_07/media/B6F5DDA2-9936-4220-B5F7-BFBEED6BA6AB_zpslbpd3btr.jpg.html][/URL]

 

[nvrenuf]

Why did it overheat?

That piston is fubar'd.

 

[dabomb6608]

With all that piston damage I am curious what the cylinder wall looks like?

 

[dyeager535]

What do the cylinder walls look like?

I'd be surprised if they don't have nice gouges based on the way that piston looks from parts bouncing around in there.

Edit: Damn, beat me to it

 

[ChevyWoods89]

It was a leaking freeze plug that got worse as he drove 3 hours. The truck sat for a few months prior to that at my grandmothers house according to my father. All this happened while I was deployed. The cylinder wall looks to be in good shape. The oil was drained and was clean

 

[dabomb6608]

If you can feel any kind of significant nicks or scratches in the wall of that cylinder then your looking at a rebuild for sure. Let me dig up some pictures of my motor that's in my Trans Am and show you how mine looked after pistons started coming apart. I was able to get by without doing a hone or bore. Long story short it was on a fresh rebuild when it did this so you can still see the cross hatching very easily. I got lucky. Maybe you will too.

 

[dabomb6608]

Here you go. One thing to mention. The dark lines going up the cylinder wall were smooth. Not a scratch or rough spot on the wall. I spoke with the machine shop who did the machine work on the block only a few months before this happened, show them these pictures, and talked about what happened and they said I was going to be ok. Cause was detonation if you were wondering. Long story as I said...live and learn







After looking a little closer at your picture it looks like there is rust forming at the top of the piston all around the cylinder? Will the motor turn? You said its sat for a while right?

 

[ChevyWoods89]

Yea the truck sat from about August to October. It will still turn over and you can still see cross hatching on the cylinder walls but I can't feel any scratches on them

 

[sweetk30]

all those pints on the impact sights will create hot spots and lead to pre ignition ( aka pinging ) and over heat that cylinder and cause you lots of trouble.

 

[4X4HIGH]

Not to mention I'll guarantee the top ring is broken.

 

[dabomb6608]

I would say that if you are needing to get it mobile asap then you could slap it together with a new piston/rings. But it won't be trustworthy and expect to do a rebuild in the future.

Seeing the rust forming in the cylinder wall like that and seeing what I think looks like rust in the #3 cylinder next to it I would highly recommend at the very least a little hone work. But if your going to go through that your right there at getting a bore done.

None of that is the right thing to do by any means. But it MIGHT get you by for a couple months....key word might...

If it were me. I would do a full rebuild or find me a cheap running sbc motor to swap in...I bought a 350 short block out of a 87' Corvette when the 305 in my Jimmy spun a rod bearing. Got it for $300 bucks. Way cheaper then a full rebuild on the 305 with the added benefit of more cubes. Look around craigslist and talk with the guys at your local auto stores. They know of deals typically.