2001 Toyota Camry engine seized.

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Coolant ingestion from a failing head gasket, or a crack? that finally gave up and filled a cylinder enough to hydrolock?

What have you done to investigate further?
If coolant was getting into the oil from a failing head gasket the oil would be milky. But it's not common for head gaskets to blow in Toyotas.
 
If coolant was getting into the oil from a failing head gasket the oil would be milky. But it's not common for head gaskets to blow in Toyotas.
Coolant could have been going only into the cylinder. Could be head gasket, could be a crack in the block or head. Did you pull the plugs and look to see what they look like?
 
OP said it was knocking before it seized, so in most likelihood it spun a bearing.
I missed that. One thing that is known on these motors is the o ring on the oil pump. They get brittle and can cause a big leak. They should be replaced as part of the TB job but…

But it should still make some amount of oil pressure, at least until it all pumps out. So it doesn’t quite fit.

Maybe a valve called it quits. Rattled around until it wedged itself just right.
 
Coolant could have been going only into the cylinder. Could be head gasket, could be a crack in the block or head. Did you pull the plugs and look to see what they look like?
When I changed the plugs they had some black stuff on them. I think that was just due to the plugs being over 30,000 miles old and dirty and needing to be changed.
 
You might try turning it over with a wrench to determine that it is actually seized.
This could be a lot less catastrophic than it appears at first thought.
 
OP said it was knocking before it seized, so in most likelihood it spun a bearing.
Agree. Op pull the oil pan and see if anything looks burnt, spun bearings get hot, and sometimes the area around the bearing turns a shade of black from burnt oil.
 
Have you put a bar on the crank pulley and verified that it's actually seized?

He has apparently answered this question on another forum.

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It’s as if he wants someone to tell him exactly what happened to it through the magic of the internet.
He was given suggestions on another forum, and he won’t say if he’s explored any of them. I’ve asked him twice.
We have mattbruns3 here, they have mjbruns2 over there. Coincidence, I don’t think so.
If he’s not willing to take something apart, timing cover, oil pan, whatever, he’s never going to know.
At this point, I think he’s just messing about.
 
It was probably run low on oil at some point in the past, as you said it was leaking. Has probably been for a while, and maybe the PO wasn’t as diligent about top offs.
A bearing(s) was damaged from this, and just finally decided to give up, spin, and seize the crank.
 
Imagine it's 1990 or 2000 and someone complains their 25 year old engine with 200k miles siezed. With some oil leaking. And some overheating.
 
OP -
You've searched out the same basic question at several different places.
I can only assume you're not satisfied with the suggestions you got elsewhere, and so now you're here.

In another thread here, you were asking about the same car having all manner of misfire codes. Many suggestions were given.

Here's the quick and dirty answer for you ...
If you want to know what happened to your engine, either pay for a professional to diagnose the failure, or learn how to do a thorough, detailed tear-down yourself. Because there is no way in Hades that anyone can troubleshoot a failed engine, with no significant details and pictures, over the internet.

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