The Ford Barn

John Stone · 02-24-2012, 05:31 PM

Took this out of an engine today. The owner said he was trying to catch up with the rest of the tour when it went bang. You can see the imprint of Winfield head. I'll bet bang is an understatement.

MrTube · 02-24-2012, 05:49 PM

Ouch! What caused that?

BILL WILLIAMSON · 02-24-2012, 05:59 PM

Just guessing, I'll bet he was able to drive it home?? Bill W.

harleyjj · 02-24-2012, 06:11 PM

yikes!!!

dave in australia · 02-24-2012, 06:20 PM

My guess at what happened is that the big end babbit came apart from lack of oil during the high speed revs, then the piston/rod assembly could move further up the bore, hit the head, knocking the crown off the piston. Just a guess.

Gary WA · 02-24-2012, 07:59 PM

Sponsored Links (Register now to hide all advertisements)

Looks dry no oil??

James Rogers · 02-24-2012, 08:00 PM

Looks like a sleeve moved.

Tom Wesenberg · 02-24-2012, 09:27 PM

Oh yes, the old chicken and egg question!

So, what came first?

Did the piston hit the head and leave the skirt, or did the piston top leave the skirt, then hit the head?

John Stone · 02-24-2012, 09:44 PM

The babbitt in the rod it OK. It looks like the piston top just separated. One thing I noted is the sleeve protruded out the bottom of the cylinder about 3/4". In this case the chicken layed the egg.

[email protected] · 02-24-2012, 10:01 PM

Didn't need to see that today.

Glenn C. · 02-24-2012, 10:42 PM

Ok....IMO the sleeve moved down, and the oil ring got hung up on the top edge of the liner. Bang !

Marco Tahtaras · 02-24-2012, 11:57 PM

Maybe I skimmed too fast but didn't see anything about a sleeve being found there. I'll bet there is no counterbore in the combustion chamber. He probably had "signs" before but didn't hear/feel them.

columbiA · 02-25-2012, 01:38 AM

I think its best if you can avoid installing sleeves or valve seat inserts.At least there is no chance of them coming loose if you dont install them.Any A or B can be safely bored to .125 OS.Even at that OS,you still have about 3/16" of water jacket thickness.

James Rogers · 02-25-2012, 07:06 AM

Quote:

Originally Posted by John Stone

The babbitt in the rod it OK. It looks like the piston top just separated. One thing I noted is the sleeve protruded out the bottom of the cylinder about 3/4". In this case the chicken layed the egg.

Told you the sleeve moved. Look at the top of the sleeve and it will be down the 3/4". This is why I leave a 1/8"ledge at the bottom so this can't happen. I have other ways to keep this from happening if the sleeve is bored all the way through but won't divulge those remedies here. If you have one you are unsure of, PM me and I'll explain.

James Rogers · 02-25-2012, 07:12 AM

Quote:

Originally Posted by Marco Tahtaras

Maybe I skimmed too fast but didn't see anything about a sleeve being found there. I'll bet there is no counterbore in the combustion chamber. He probably had "signs" before but didn't hear/feel them.

Quote:

Originally Posted by John Stone

The babbitt in the rod it OK. It looks like the piston top just separated. One thing I noted is the sleeve protruded out the bottom of the cylinder about 3/4". In this case the chicken layed the egg.

My first guess. I have seen this before.

John Duden · 02-25-2012, 08:55 AM

this happened to my truck! This is why it was Parked in '76

John Stone · 02-25-2012, 10:18 AM

The sleeve did not move, they are just long sleeves. The head had a counter bore and there is no evidence of any other piston hitting.
I would think there might have been a casting flaw or a small crack in the piston along with hard driving. Have no idea how fast he was going when it went.

John LaVoy · 02-25-2012, 10:26 AM

Quote:

Originally Posted by John Stone

The babbitt in the rod it OK. It looks like the piston top just separated. One thing I noted is the sleeve protruded out the bottom of the cylinder about 3/4". In this case the chicken layed the egg.

Years ago a club member had the sleeve slide down enough that the ring caught on the top and locked the engine up. The sleeve was not pinned to the block in this case, how about in yours?

John Stone · 02-25-2012, 10:45 AM

Quote:

Originally Posted by John LaVoy

Years ago a club member had the sleeve slide down enough that the ring caught on the top and locked the engine up. The sleeve was not pinned to the block in this case, how about in yours?

I think you missed my post right before yours. The sleeve did not move.

Tom Wesenberg · 02-25-2012, 11:27 AM

How high are the pistons above the block?
How thich is the compressed haed gasket?
How deep is the head counterbore?

Just trying to determine the available clearance.

02-24-2012, 05:49 PM	#2
MrTube Senior Member Join Date: Jun 2010 Location: New Jersey Posts: 1,471	Re: This will ruin your day!!!! Ouch! What caused that?

02-24-2012, 05:59 PM	#3
BILL WILLIAMSON Senior Member Join Date: Dec 2010 Location: FRESNO, CA Posts: 12,560	Re: This will ruin your day!!!! Just guessing, I'll bet he was able to drive it home?? Bill W. __________________ "THE ASSISTANT GURU OF STUFF"

02-24-2012, 06:11 PM	#4
harleyjj Senior Member Join Date: Oct 2011 Location: Northville/Salem Mi Posts: 150	Re: This will ruin your day!!!! yikes!!!

02-24-2012, 06:20 PM	#5
dave in australia Senior Member Join Date: May 2010 Location: Victoria, Australia Posts: 1,175	Re: This will ruin your day!!!! My guess at what happened is that the big end babbit came apart from lack of oil during the high speed revs, then the piston/rod assembly could move further up the bore, hit the head, knocking the crown off the piston. Just a guess.

02-24-2012, 07:59 PM	#6
Gary WA Senior Member Join Date: May 2010 Location: Clinton,WA/Whidbey Island Posts: 4,100	Re: This will ruin your day!!!! Sponsored Links (Register now to hide all advertisements) Looks dry no oil?? __________________ www.whidbeymodelaclub.com

02-24-2012, 08:00 PM	#7
James Rogers Senior Member Join Date: May 2010 Location: Asheville,NC Posts: 3,104	Re: This will ruin your day!!!! Looks like a sleeve moved.

02-24-2012, 09:27 PM	#8
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: This will ruin your day!!!! Oh yes, the old chicken and egg question! So, what came first? Did the piston hit the head and leave the skirt, or did the piston top leave the skirt, then hit the head?

02-24-2012, 09:44 PM	#9
John Stone Senior Member Join Date: May 2010 Location: Wichita, Kansas Posts: 710	Re: This will ruin your day!!!! The babbitt in the rod it OK. It looks like the piston top just separated. One thing I noted is the sleeve protruded out the bottom of the cylinder about 3/4". In this case the chicken layed the egg.

02-24-2012, 10:01 PM	#10
[email protected] Senior Member Join Date: Aug 2010 Posts: 937	Re: This will ruin your day!!!! Didn't need to see that today. __________________ It's 110 miles to Chicago We've got half a pack of cigarettes It's dark And we're wearing sunglasses Let's go.

02-24-2012, 10:42 PM	#11
Glenn C. Senior Member Join Date: May 2010 Location: Didsbury Alberta Posts: 838	Re: This will ruin your day!!!! Ok....IMO the sleeve moved down, and the oil ring got hung up on the top edge of the liner. Bang !

02-24-2012, 11:57 PM	#12
Marco Tahtaras Senior Member Join Date: May 2010 Posts: 3,099	Re: This will ruin your day!!!! Maybe I skimmed too fast but didn't see anything about a sleeve being found there. I'll bet there is no counterbore in the combustion chamber. He probably had "signs" before but didn't hear/feel them. __________________ http://www.abarnyard.com/

02-25-2012, 01:38 AM	#13
columbiA Senior Member Join Date: Nov 2011 Location: B.C. Canada Posts: 1,746	Re: This will ruin your day!!!! I think its best if you can avoid installing sleeves or valve seat inserts.At least there is no chance of them coming loose if you dont install them.Any A or B can be safely bored to .125 OS.Even at that OS,you still have about 3/16" of water jacket thickness.

02-25-2012, 08:55 AM	#16
John Duden Senior Member Join Date: Jun 2010 Posts: 1,854	Re: This will ruin your day!!!! this happened to my truck! This is why it was Parked in '76

02-25-2012, 10:18 AM	#17
John Stone Senior Member Join Date: May 2010 Location: Wichita, Kansas Posts: 710	Re: This will ruin your day!!!! The sleeve did not move, they are just long sleeves. The head had a counter bore and there is no evidence of any other piston hitting. I would think there might have been a casting flaw or a small crack in the piston along with hard driving. Have no idea how fast he was going when it went.

02-25-2012, 11:27 AM	#20
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: This will ruin your day!!!! How high are the pistons above the block? How thich is the compressed haed gasket? How deep is the head counterbore? Just trying to determine the available clearance.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode