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Re: Dropped valve seat - 140Hp
Posted by: JimBrandberg ()
Date: November 17, 2020 07:17AM

I agree with alphasud. I don't think anything minor that would mangle a spark plug like that.

I might do a Leakdown Test but a Compression Test may involve further bashing. I do testing for hypothesis before going in but your condition will probably be apparent when you remove the head.

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: Dropped valve seat - 140Hp
Posted by: Spectre ()
Date: November 17, 2020 07:46AM

With the plug damage, you know the head has to come off. Might as well pull it now.

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Norman, OK

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Re: Dropped valve seat - 140Hp
Posted by: joelsplace ()
Date: November 17, 2020 10:09AM

I agree that that plug appears to have a problem.
Funny thing I have a 66 230 Malibu that did that to a plug. I put in a new one and it has been running fine for a thousand miles or so now. I'm holding my breath on that one. I can't figure out what could have caused it and not killed the cylinder. Of course it wasn't making any bad noises either so no help for you. That head has to come off.

Joel
Northlake, TX
5 Ultravans, 113 Corvairs and counting...

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Re: Dropped valve seat - 140Hp
Posted by: MikeBuongiorno ()
Date: November 19, 2020 10:59AM

Behold !! Have never seen anything like this !!

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Re: Dropped valve seat - 140Hp
Posted by: KenHenry ()
Date: November 19, 2020 11:31AM

Oh no! What a mess. So the piston exploded and the valve seat was OK? Unfortunately it looks your combustion chamber took quite a pounding. Ken

Ken Henry, Rochester, NY USA
1965 Corvair Corsa
140 hp, 4 speed



Edited 1 time(s). Last edit at 11/19/2020 11:32AM by KenHenry.

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Re: Dropped valve seat - 140Hp
Posted by: RobertC ()
Date: November 19, 2020 12:07PM

Sorry to see that.

You need to replace all the pistons on the other side, also

When I had my 140 rebuilt at 126,000 miles, all 6 of the stock pistons had cracks in them.

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Re: Dropped valve seat - 140Hp
Posted by: alphasud ()
Date: November 19, 2020 12:37PM

Oh crap! That had to have sounded horrific! Maybe find another used engine so you can continue to drive it while you work on your first project. Again my heart goes out to you that’s a real bummer!

David North Idaho
1965 Corsa Turbo converted to 140
1971 Super Beetle with 2.5L Subaru engine
1965 Corsa mid engine project
1973 Mercedes 280 project

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Re: Dropped valve seat - 140Hp
Posted by: jjohnsonjo ()
Date: November 19, 2020 01:19PM

My guess is that builder re-used factory pistons. There have been numerous warning here about doing that. That is the worst case example I have ever seen

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: Dropped valve seat - 140Hp
Posted by: isucorvair ()
Date: November 19, 2020 01:58PM

Look at how well those staked valve seats are holding up though!

Eric P
DeWitt, IA

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Re: Dropped valve seat - 140Hp
Posted by: Spectre ()
Date: November 20, 2020 04:39AM

I had a piston do that once when I was 19 or 20. It was then that I learned about not reusing factory 164 pistons. The noise was not that bad. When the piston crown separated, it sounded like a lifter that was not pumped up. I checked the oil level and it was less than 1 quart low. I decided to get a quart of oil on the way home and top it off. Driving down the interstate with loud exhaust and stereo, the piston came apart and the left tail pipe looked like I was driving a fog machine. I pulled over, pressed in the clutch, and a piece of piston lodged in the timing gears and the engine locked up.

Post mortem showed piston got into everything. The rod had nothing on it, was twisted and bent, and punched a hole in the baffle at the top of the block. It never punched through but the block was trashed. The only thing I was able to reuse was 5 cylinders and rods, heads, oil pan, rear housing, bell housing, and top block cover.

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Norman, OK

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Re: Dropped valve seat - 140Hp
Posted by: JimBrandberg ()
Date: November 20, 2020 06:28AM

Yes I always tell people it gets expensive fast once you start buying new pistons and boring cylinders but that's why we do it.

Those aluminum bits are now everywhere including the oil pump and crankshaft oil passages.

I'd be interested in a picture of the piston to see if it broke at the top ring groove, although now that I looked at the photo again it seems to be further down. Looks like original type pistons?

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: Dropped valve seat - 140Hp
Posted by: Spectre ()
Date: November 20, 2020 03:34PM

The piston I shattered mentioned above. These were the largest pieces.

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Norman, OK

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Re: Dropped valve seat - 140Hp
Posted by: guthrie1068 ()
Date: November 20, 2020 03:39PM

WOW!

Chad Guthrie
Onondaga, MI
'63 convertible

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