Potential Cause of rumored GR86’s blown engine? Seal packing(RTV) was peeled off

[Tcoat]

Originally Posted by Stonehorsw

Would blackstone oil check be able to verify that before a bigger failure?

I doubt an oil analysis would have any meaningful indication. A new engine is going to show high on silicon whether it is where it belongs or in the filter. Not like it is getting chopped up into small particles so there really wouldn’t be anything unexpected to catch.

[DocWalt]

Originally Posted by Sasquachulator

IS this considered a design flaw?

Seems like they designed the sealant area with a very tight tolerance...which is usually ideal is it not?

I guess its just the nature of the sealant, just like in CPU's where you only need to place a dab of thermal past on the center of the CPU before placing the heatsink/fan, and not a whole goop covering the entire CPU....which actually performs worse for heat transfer.

It's an assembly issue, IMO. Design seems fine.

[Ultramaroon]

Originally Posted by DocWalt

It's an assembly issue, IMO. Design seems fine.

Devil's in the deets

[Tcoat]

Originally Posted by DocWalt

It's an assembly issue, IMO. Design seems fine.

Assembly and QC. Though not sure how they could actually inspect it.

[DocWalt]

Originally Posted by Ultramaroon

Devil's in the deets

Sure, still not a design issue though. Whoever calibrated the sealant gun and checked off on it failed at their jobs.

Originally Posted by Tcoat

Assembly and QC. Though not sure how they could actually inspect it.

No good way to inspect it, just use an appropriate quantity of sealant.

[Tcoat]

Originally Posted by DocWalt

Sure, still not a design issue though. Whoever calibrated the sealant gun and checked off on it failed at their jobs.





No good way to inspect it, just use an appropriate quantity of sealant.

And in the right place.

[Petah78]

Actually, would an oil pressure gauge give you early warnings signs?

[Spektyr]

Originally Posted by Petah78

Actually, would an oil pressure gauge give you early warnings signs?

Depends on how it fails. If pieces break off, or the "rope" is gradually ingested you may see oil pressure drift over time.

But if it's one big chunk that wasn't a problem and then is, you'll see the needle bottom out and then, rapidly, the engine puke.

Originally Posted by Tcoat

Assembly and QC. Though not sure how they could actually inspect it.

Borescope up the drain plug could do it. I have one so I'm thinking about doing that next oil change.

[Rustyoid]

anyone who has this happen should share their build date and engine serial number

[Ultramaroon]

Originally Posted by DocWalt

Sure, still not a design issue though. Whoever calibrated the sealant gun and checked off on it failed at their jobs.

Those are the deets I meant. Please excuse my lazily expressed agreement.

[FrickingReallySlow]

Are you able to borescope up the Pickup neck? or can it not make a twist at a sharp enough angle?

we all know that RTV degrades with thermal cycling and gets harder with age + thermal cycling (-25C to 70C) so it would make sense that cars that went through the first winter in Japan or US and were driven everyday might see more of this excess RTV fall off in the pan. NVH of a sportscar will help shake it off.

Originally Posted by DocWalt

I was due for an oil change so I poked my crappy old borescope in the pan. Plenty of excess RTV. Not as bad as that above example from the Toyota tech, but still.

[Tcoat]

Originally Posted by Spektyr

Depends on how it fails. If pieces break off, or the "rope" is gradually ingested you may see oil pressure drift over time.

But if it's one big chunk that wasn't a problem and then is, you'll see the needle bottom out and then, rapidly, the engine puke.



Borescope up the drain plug could do it. I have one so I'm thinking about doing that next oil change.

Oh easy to do individual cars. I meant at the plant as part of the QC checks. It would be way to costly to do every engine but they probably do one in ca set number. Doesn’t mean many could slip through though.

[toeout]

They have not told me the actual reason yet.

The day that I dropped it off, they did some kind of ECU check and said that the car had been ridden hard, many rev limit instances and also an overrev event at 7900 rpm 2000 miles before the engine failure.

The dealer told me that Toyota will fix it this time under warranty, but will not the second time under similar circumstances. Basically telling me that I caused the failure with the overrev.

This was all before they even removed the engine from the car. The fact that they ordered a short block and will re-use the heads is pretty telling that the overrev had nothing to do with it.

Originally Posted by Petah78

Do you have confirmation for the demise of your engine? Blocked oil pick up? Or its still being investigated by the dealer?

[Tcoat]

Originally Posted by toeout

They have not told me the actual reason yet.

The day that I dropped it off, they did some kind of ECU check and said that the car had been ridden hard, many rev limit instances and also an overrev event at 7900 rpm 2000 miles before the engine failure.

The dealer told me that Toyota will fix it this time under warranty, but will not the second time under similar circumstances. Basically telling me that I caused the failure with the overrev.

This was all before they even removed the engine from the car. The fact that they ordered a short block and will re-use the heads is pretty telling that the overrev had nothing to do with it.

In fairness to the dealer they do need to look at ALL the possibilities including over revs. Money shifts do kill engines! Usually right away and not at a couple of hundred RPM like you did but still.

So at this point it is not confirmed yours is sealant related even though it is high (lily top) on the list of probabilities. Just hope that if they find any they are honest about it.

Ordering a short block and reusing heads in not a great indicator it wasn't over rev. Could easily do bottom end damage and not touch the heads.