Grr! Split cylinder, head damage!
#2828376
10/03/20 06:37 PM
10/03/20 06:37 PM
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gregsdart
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I have a caved in #2 cylinder and a torched cylinder head to deal with now. Not sure why this happened, but I remember the starter baulking once. So, did the gasket fail, then hydro lock the cylinder? Thats what i assume. Makes me wonder if the surface finish was right for cometic gasket? The bad spot on the head is very shallow, like maybe .002 deep but still will have to be fixed. I hope they don't have to cut both heads to fix this. The block is fine on the deck surface luckily.
Last edited by gregsdart; 10/03/20 06:44 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Grr! Split cylinder, head damage!
[Re: gregsdart]
#2828380
10/03/20 06:52 PM
10/03/20 06:52 PM
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fast68plymouth
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Did the gasket fail in the area adjacent to the crack in the cylinder?
Hard to tell by looking st a pic on my phone....... and it may not have anything to do with the failure........ but the machining marks in the gasket look coarser than what I’d do for a MLS gasket.
I’d also look at the relationship between the gasket bore and the cylinder bore....... to be sure the edge of the gasket bore was definitely not hanging into the cylinder bore...... at all.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Grr! Split cylinder, head damage!
[Re: Clanton]
#2828413
10/03/20 08:12 PM
10/03/20 08:12 PM
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gregsdart
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Not sure what happened. It may have gotten too much fuel in the cylinder from the primerplus gasoline system. I have a 5 psi oil pressure switch for safety but also use an acumulater to prelube, which would allow fuel to pump into the motor if i turned the primerplus switch on before i prelubed.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Grr! Split cylinder, head damage!
[Re: gregsdart]
#2828921
10/05/20 12:59 PM
10/05/20 12:59 PM
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Al_Alguire
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Was it a new gasket or a reuse? Have seen a couple Cometic failures of late but with in the "firing ring" area of the gasket not a water jacket? The head surface finish sure seems a tad "rough" but could just be the pic..FWIW we actually use a bit of Hylomar around the water jackets on the ends. Hopefully wont be to spendy to get fixed up.
"I am not ashamed to confess I am ignorant of what I do not know."
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Re: Grr! Split cylinder, head damage!
[Re: Al_Alguire]
#2828954
10/05/20 02:28 PM
10/05/20 02:28 PM
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Mopar Mitch
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Did the raised embossing of the head gasket's compression ring area fall into an un-compressed area... of the head chamber? I've seen that on various engines ... and then the gasket cannot seal compression.
Also, it looks as though the surface finish is very rough... far greater than what is required for MLS gaskets (requires near glass-smooth... and sometimes the machine shops simply can't get that surface finish without spending careful time doing it... on both the deck and head surfaces, not just the head surface as is commonly brought to the shop).
Mopar Mitch
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Re: Grr! Split cylinder, head damage!
[Re: Cab_Burge]
#2828994
10/05/20 04:40 PM
10/05/20 04:40 PM
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gregsdart
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A couple of things; those areas that look like corrosion are actually depressions in the bore that are DEEP. And the one further down the bore is a crack you can catch a fingernail on. Also look at the fire ring of the gasket itself. It looks narrower close to the water jacket. That would indicate it wasn't squeezed enough ; improper(low) torque or a warped block? There is no corrosion anywhere. I cleared the motor with gasoline before putting it away for the day to eliminate corrosion.
Last edited by gregsdart; 10/06/20 09:38 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Grr! Split cylinder, head damage!
[Re: Cab_Burge]
#2829556
10/06/20 09:25 PM
10/06/20 09:25 PM
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moparacer
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I see corrosion around the rings in that cylinder in the last photo from sitting and maybe condensation in that cylinder while sitting, no cracks in a cylinder I see Sorry for your problems, I hate Murphy That is from methanol laying in the cylinders. I have seen that enough times over the years. The only way I ever got that to stop is to put a gas primer on my car and run it on gas to clean the cylinders out at the end of the day.
67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174
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Re: Grr! Split cylinder, head damage!
[Re: moparacer]
#2829634
10/07/20 07:41 AM
10/07/20 07:41 AM
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440Jim
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That is from methanol laying in the cylinders.
I have seen that enough times over the years.
The only way I ever got that to stop is to put a gas primer on my car and run it on gas to clean the cylinders out at the end of the day.
Does running top end lube in the methanol help at all? I see Greg did use a gas primer system, including at the end of the day to clear the engine.
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Re: Grr! Split cylinder, head damage!
[Re: Al_Alguire]
#2829655
10/07/20 09:09 AM
10/07/20 09:09 AM
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HardcoreB
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Was it a new gasket or a reuse? Have seen a couple Cometic failures of late but with in the "firing ring" area of the gasket not a water jacket? The head surface finish sure seems a tad "rough" but could just be the pic..FWIW we actually use a bit of Hylomar around the water jackets on the ends. Hopefully wont be to spendy to get fixed up. Agree surface APPEARS a little rough...when in doubt, lap the surface. ALSO, i always use some type of sealer around water...anaerobic, hylomar, even pipe dough sparingly sometimes. I'm sorry for the bad luck here Greg. Hope you an piece it back together economically reasonable.
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Re: Grr! Split cylinder, head damage!
[Re: gregsdart]
#2829659
10/07/20 09:12 AM
10/07/20 09:12 AM
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madscientist
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A couple of things; those areas that look like corrosion are actually depressions in the bore that are DEEP. And the one further down the bore is a crack you can catch a fingernail on. Also look at the fire ring of the gasket itself. It looks narrower close to the water jacket. That would indicate it wasn't squeezed enough ; improper(low) torque or a warped block? There is no corrosion anywhere. I cleared the motor with gasoline before putting it away for the day to eliminate corrosion. I can’t remember for sure if you have an aluminum block (I'm pretty sure you do) so whenever I do an all aluminum engine I torque the heads from the OUTSIDE in, not from the inside out. I forget who taught me that because it’s been 25 or 30 years, but it’s still the way I do it.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Grr! Split cylinder, head damage!
[Re: 440Jim]
#2829847
10/07/20 02:48 PM
10/07/20 02:48 PM
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gregsdart
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No Jim, it is closer to the top. Al, new gasket. I was told it could have been caused by a register dowel being too tight
Last edited by gregsdart; 10/07/20 02:51 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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