thoughts on this pic of #1 piston - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sharkskinman · 02-11-2016, 05:41 PM

Decided to take head off and replace some gaskets
I did wire wheel it first
Thoughts??

jtrichard · 02-11-2016, 07:05 PM

burnt piston NOT GOOD

**chevy2tom** · 02-11-2016, 08:17 PM

Paperweight

**kwmech** · 02-12-2016, 09:08 AM

What does number 6 look like

TJ's Chevy · 02-12-2016, 01:59 PM

Not good.

sharkskinman · 02-12-2016, 02:41 PM

All others look good
Replaced some gaskets including head gasket..
All u can do for now is seal it up, button it up and drive it till new engine

**70STOVEBOLT** · 02-12-2016, 11:16 PM

Looks like detonation damage.

**kwmech** · 02-13-2016, 03:12 AM

Quote:

Originally Posted by 70STOVEBOLT

Looks like detonation damage.

That's why I asked about #6. The end cylinders tend to run lean

frankslagoon · 02-13-2016, 04:03 PM

I haven't messed with gm inlines for awhile. can he push the piston /rod ass. up and replace the piston?

TJ's Chevy · 02-13-2016, 05:54 PM

Quote:

Originally Posted by frankslagoon

I haven't messed with gm inlines for awhile. can he push the piston /rod ass. up and replace the piston?

He could, but I do wonder how bad the cylinder wall is damaged.

chevybuldr · 02-13-2016, 03:09 AM

Yea that isn't going to work at all. The top ring is blown out and compassion is going to just go no where but in the pan. If that thing doesn't smoke or use oil I will be shocked.

sharkskinman · 02-13-2016, 06:12 PM

Inside cylinder looks fine
Can't be without it long enough to replace the piston..
I am looking for 1 for a replacement
But can't imagine changing it unless I plan on re ringing it tho

TJ's Chevy · 02-13-2016, 07:18 PM

Quote:

Originally Posted by sharkskinman

Inside cylinder looks fine
Can't be without it long enough to replace the piston..
I am looking for 1 for a replacement
But can't imagine changing it unless I plan on re ringing it tho

And a re-ring means honing the cylinder as well so the new rings will seat properly.

**Ironangel** · 02-13-2016, 08:42 PM

I was thinking "PING Damage" as well...Fix that and that thing might surprise you how long it will last, especially with the timing retarded a bit...? Timing and/or bad gas and high compression...?

haysonj · 02-13-2016, 10:56 PM

Quote:

Originally Posted by sharkskinman

Inside cylinder looks fine
Can't be without it long enough to replace the piston..
I am looking for 1 for a replacement
But can't imagine changing it unless I plan on re ringing it tho

I may have got lucky but I had a 67 with a six in it and I replaced one piston only with new rings on the one piston and the truck ran fine for two years and was still running when I sold it. The old sixes are pretty forgiving and are not a high rpm race engine.

sharkskinman · 02-14-2016, 03:03 PM

Timing set at 4*
Some have suggested to up that..to what tho??
If I can get its smoking to a minimum then it can wait till another engine
But graces is that it's at the front so I guess I can lift it up enough to get that one out and replace it maybe

Anyone got a couple good used to get rid of?? Pay it forward possibly??

sharkskinman · 02-14-2016, 04:02 PM

Compression test

#6-145
#5-150
#4-160
#3-140
#2-140
#1-30..oil in-60

So now need piston and it will be straight till new engine!!

sharkskinman · 02-14-2016, 04:24 PM

What would I have to take off to simply tilt the motor up enough to get pan off and get to rod bolts?
Probably change some gaskets n 2 piece seal while I'm at it

02-12-2016, 11:16 PM	#7
70STOVEBOLT Senior Member Join Date: Jun 2005 Location: Winona Lake, IN Posts: 6,415	Re: thoughts on this pic of #1 piston Looks like detonation damage. __________________ 70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear

02-13-2016, 04:03 PM	#9
frankslagoon Registered User Join Date: Jan 2014 Location: Wasilla Alaska Posts: 537	Re: thoughts on this pic of #1 piston I haven't messed with gm inlines for awhile. can he push the piston /rod ass. up and replace the piston?

02-13-2016, 03:09 AM	#11
chevybuldr Registered User Join Date: Oct 2008 Location: Livermore ca Posts: 699	Re: thoughts on this pic of #1 piston Yea that isn't going to work at all. The top ring is blown out and compassion is going to just go no where but in the pan. If that thing doesn't smoke or use oil I will be shocked.

02-13-2016, 06:12 PM	#12
sharkskinman Registered User Join Date: Oct 2014 Location: new orleans Posts: 302	Re: thoughts on this pic of #1 piston Inside cylinder looks fine Can't be without it long enough to replace the piston.. I am looking for 1 for a replacement But can't imagine changing it unless I plan on re ringing it tho

02-13-2016, 08:42 PM	#14
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: thoughts on this pic of #1 piston I was thinking "PING Damage" as well...Fix that and that thing might surprise you how long it will last, especially with the timing retarded a bit...? Timing and/or bad gas and high compression...? __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"

02-11-2016, 05:41 PM	#1
sharkskinman Registered User Join Date: Oct 2014 Location: new orleans Posts: 302	thoughts on this pic of #1 piston Decided to take head off and replace some gaskets I did wire wheel it first Thoughts?? Attached Images

02-11-2016, 07:05 PM	#2
jtrichard Registered User Join Date: Jun 2013 Location: joshua tree ca. Posts: 1,484	Re: thoughts on this pic of #1 piston burnt piston NOT GOOD

02-11-2016, 08:17 PM	#3
chevy2tom Senior Member Join Date: Aug 2009 Location: Wheeling, Illinois Posts: 703	Re: thoughts on this pic of #1 piston Paperweight

02-12-2016, 09:08 AM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,637	Re: thoughts on this pic of #1 piston What does number 6 look like

02-12-2016, 01:59 PM	#5
TJ's Chevy Registered User Join Date: Mar 2013 Location: Southern Oregon Posts: 10,384	Re: thoughts on this pic of #1 piston Not good. __________________ 1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw

02-12-2016, 02:41 PM	#6
sharkskinman Registered User Join Date: Oct 2014 Location: new orleans Posts: 302	Re: thoughts on this pic of #1 piston All others look good Replaced some gaskets including head gasket.. All u can do for now is seal it up, button it up and drive it till new engine

02-14-2016, 03:03 PM	#16
sharkskinman Registered User Join Date: Oct 2014 Location: new orleans Posts: 302	Re: thoughts on this pic of #1 piston Timing set at 4* Some have suggested to up that..to what tho?? If I can get its smoking to a minimum then it can wait till another engine But graces is that it's at the front so I guess I can lift it up enough to get that one out and replace it maybe Anyone got a couple good used to get rid of?? Pay it forward possibly??

02-14-2016, 04:02 PM	#17
sharkskinman Registered User Join Date: Oct 2014 Location: new orleans Posts: 302	Re: thoughts on this pic of #1 piston Compression test #6-145 #5-150 #4-160 #3-140 #2-140 #1-30..oil in-60 So now need piston and it will be straight till new engine!!

02-14-2016, 04:24 PM	#18
sharkskinman Registered User Join Date: Oct 2014 Location: new orleans Posts: 302	Re: thoughts on this pic of #1 piston What would I have to take off to simply tilt the motor up enough to get pan off and get to rod bolts? Probably change some gaskets n 2 piece seal while I'm at it



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