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2014 Toyota GT86 spun bearing?
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RedGhost
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May 5, 2023, 12:27 AM
Post #1 of 12
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2014 Toyota GT86 spun bearing?
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Heya!
I hope you can help me out. I got a (new to me) GT86 about a year ago and have since put 7.000km on the odometer to a grand total of 97.000kms. The car is a 2014 model from Toyota. It has a 2.0l boxer, unmodified except for a chiptune done by the previous owner.
The engine has ran beautifully and there was no noise at all for over the year I've got it. I changed all fluids myself after purchase date.
Now, here is where I came across the problem. It happened last weekend on my way home from the cinema. When I started the engine at the cinema, there was no noise. I'm sure of it. Then I cranked the music up a bit, but I'm also fairly sure there was no noise. I just can't rule it out. During that time I also did some spirited driving, and accidentally red lined the engine once on first gear during a stop light. I've never done that before, and it was a stupid mistake.
Right after the redline incident at the mid-way point I stopped at the gas station I usually tank at for E98. I accidentally drove over a water bottle which exploded under my car. This may or may not be related. My tank was half way full and I filled it up to full. When I started driving I began to hear a slight rattle after a minute or so. I didn't think too much of it (I know... ) so I continued driving without music to monitor the sound. Eventually after a minute or 5 it became a lot worse so I stopped the car and opened the hood. A very loud knocking was heard coming from the passenger side of the engine. The sound became a lot worse between 3000 and 4000 rpm and died down on the higher rpms. Since I had 10 more minutes to drive home I decided to limp it home myself. It was late at night and I have no road-side assistance. Once at home I haven't started the car, scared for what lay inside.
I drained the oil and inspected the oil filter for bearing material or metal shavings. The oil looked really healthy and the dipstick indicated it was half-full. I even held a very powerful magnet in the oil in a plastic bag to see if something would stick but nothing did. This relieved my expectations a bit.
The day after I decided to start the engine for a short while and record it, to try and see where it came from. The noise it made was so loud and metallic that we didn't want to risk damage so we shut it off, not allowing me to inspect where the noise comes from exactly with a mechanic stethoscope.
The video I recorded can be seen here: https://www.youtube.com/shorts/C6yX_NAEQTU
My question is as follows: is this a spun bearing/rod knock? I'm fairly sure but before pulling the engine I want to be sure there is nothing else I should check.
Thanks in advance!
(This post was edited by RedGhost on May 5, 2023, 12:32 AM)
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Tom Greenleaf
Ultimate Carjunky
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May 5, 2023, 3:17 AM
Post #2 of 12
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Re: 2014 Toyota GT86 spun bearing?
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US based site limits us a bit however you stated a lot of possible causes then soon after this is in fact a deadly noise to hear.
It is a "boxer" means to me (local or slang?) "flat" design mostly a Subaru's design or perhaps is theirs?
Theirs do well long figured out how to lube the things plus lasting raw mechanicals.
Questions, reasons and noted things,
* Began running over a water bottle! OK - was it full of water somehow (doubted) and sucked water up air intake(s) may never know.
* Accidental over RPM? Most engines out there limit that perhaps not enough??
* You said or I take it you measured it was only 1/2 full of oil? That's a killer especially RPMs too high oil must return fast enough to maintain full oil pressure might suck air! Instant damage could result.
*Calling the spinning bearing isn't right a nasty problem from a new bearing of 2 halves not measured right is usually instantly after remanufacturing an engine. Later would be worn so fast oil would leak out early as it does it's job in order for adequate pressure lost and get worse by the time frame this did!
OK, not OK. Video helped me the knock upon start up, cold (take your word) and sound goes away is usually a bearing knock.
Now may show other vitals OK but I think self-destructing now.
Bent rods, seriously worn bearing sometimes you can cancel one at a time (firing of a cylinder) may go quiet on bad one?
Long post by you and as long by me do whatever more testing you need or want to before it's disabled totally via taking it out might be required to see it while taking apart.
To me that fatal for that engine > bent rods, badly worn bearing(s) on one or more. Opinion is if full machining of block required and new sizes you limit life of that job engines are only machined new once the deep machining twice wasn't allowed by metal or designs to balance out perfectly ever again.
Brace to find IMO another whole, matching engine is low mile/kms donor that was otherwise salvaged for parts.
Good luck about now you could use my guess being wrong,
Tom
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Hammer Time
Ultimate Carjunky
/ Moderator
May 5, 2023, 4:07 AM
Post #3 of 12
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Re: 2014 Toyota GT86 spun bearing?
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Sounds like that needs a lot more investigation.
I don't know if this car uses a timing belt or a chain but that sound could be a chain noise.
It could be a bearing noise too but either way it doesn't sound like a bearing has completely spun but I certainly would not run the engine again until this gets resolved or you will end up nothing more than a boat anchor.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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May 5, 2023, 5:32 AM
Post #4 of 12
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Re: 2014 Toyota GT86 spun bearing?
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Glad your on this Hammer Time (HT we say) I had time to listen to a very good video this time.
Tell me and the world, I hear that on oil changing when you can't fill an oil filter for ONE second. If lots more it's an older engine, more wear still OK stays gone.
THEN THE PERSISTENT noise!
I think damage, lack of oil damage. Belt or chain(S) however done in the cards found then fixed right now would be a miracle with well written story of what might have caused this. Arg, "Where's Waldo" he's hiding for now, Tom
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RedGhost
New User
May 5, 2023, 5:38 AM
Post #5 of 12
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Re: 2014 Toyota GT86 spun bearing?
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Thank you both for your comments!
The engine is a boxer engine, flat 4 configuration made by subaru (engine code FA20 NA), naturally aspirated.
* Began running over a water bottle! OK - was it full of water somehow (doubted) and sucked water up air intake(s) may never know. The air intake is all the way on the top and the bottle was half-full of water. I doubt that it sucked in water, as there is an under engine shield in place for debris and aerodynamics.
I was more concerned with a bit of plastic launching it's way up the engine bay but thorough inspection reveals no debris or impact damage anyway, not even the metal shielding under the car.
* You said or I take it you measured it was only 1/2 full of oil? That's a killer especially RPMs too high oil must return fast enough to maintain full oil pressure might suck air! Instant damage could result. It wasn't half full in total, just half full on dip stick. Is that really an engine killer? I didn't know.. In that case, I could see where the problem comes from.
Brace to find IMO another whole, matching engine is low mile/kms donor that was otherwise salvaged for parts. Yeah, it took me a good time but I think I'm ready for that. It's not fun, but I love this car and I'm not ready to take it to the scrap yard yet.
I don't know if this car uses a timing belt or a chain but that sound could be a chain noise. The FA20 that this car runs has two timing chains, one for the left side and one for the right side. Both run two pistons, and both have their own tensioner. Chain slap is also a possible originator for this problem, I agree. When I take this engine out of the car and tear it apart the chain is one of the first components I will see, so I hope this is the best case scenario..
It could be a bearing noise too but either way it doesn't sound like a bearing has completely spun but I certainly would not run the engine again until this gets resolved or you will end up nothing more than a boat anchor. In case it hasn't fully spun yet, is the chance of recovery and re-use of the drive shaft possible? I don't mind replacing the rods- they're the weakest link in this engine when I (inevitably) add boost, but the crankshaft is already forged from the manufacturer so that'd really stink.
Thank you both for your replies!
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RedGhost
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May 5, 2023, 5:45 AM
Post #6 of 12
(1340 views)
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Re: 2014 Toyota GT86 spun bearing?
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Tell me and the world, I hear that on oil changing when you can't fill an oil filter for ONE second. If lots more it's an older engine, more wear still OK stays gone. The oil filter sits upside down in this engine, so you can't fill it up before you screw it in. That being said, I did try to fill it when I replaced it but I've replaced it 7.000km ago so I doubt that'd be the cause of this problem, no? When I inspected the oil I also unscrewed the oil filter and it was drained empty, so I doubt that it'd do much.
I think damage, lack of oil damage. Belt or chain(S) however done in the cards found then fixed right now would be a miracle with well written story of what might have caused this. Arg, "Where's Waldo" he's hiding for now, Tom That doesn't sound promising.  Let's hope for the best! I'll keep you all posted when I tear it down later this month. I have the skill and the tools, but I don't really have the time. That is what bothers me the most..
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Tom Greenleaf
Ultimate Carjunky
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May 5, 2023, 6:03 AM
Post #8 of 12
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Re: 2014 Toyota GT86 spun bearing?
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Tell me/us/all for OP. There should be oil filters that don't empty if they must be installed upside down? It might be next engine time would find out or problem should be chronic to these as oil would go there first IMO all designs I know of. IF not, special attention to highest possible oil specs that are in range for this listed by viscosity #s then ratings of tolerance encrypted by letters. Duly noted you found oil level 1/2 of probably the range that's OK, qt./liter.
You are VERY observant this thread unique test, test away + hope not the next anchor! Tom
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Hammer Time
Ultimate Carjunky
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May 5, 2023, 6:11 AM
Post #9 of 12
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Re: 2014 Toyota GT86 spun bearing?
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The time for all this testing will be after the repairs.
Do not run this engine any further until problem is resolved.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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May 5, 2023, 6:18 AM
Post #10 of 12
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Re: 2014 Toyota GT86 spun bearing?
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Agree. Turn engine from crank bolt/balancer for tests, T
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RedGhost
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May 5, 2023, 6:44 AM
Post #11 of 12
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Re: 2014 Toyota GT86 spun bearing?
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I think you are asking about the crankshaft. You're right, whoops! English is not my native language so I get terms mixed up from time to time. Good to see you're not an ass about it, like some other forums I've come across 
That would be up to the machine shop to determine. If it actually does spin a bearing that would likely take out the crankshaft as well.
Forget this nitrous idea. That's a fast track to a destroyed motor. Yeah, that's what I thought. I try to be optimistic, but it's always good to get a reality check.
Do not run this engine any further until problem is resolved. I'm not planning to, I'm too afraid to damage the internals especially since the oil isn't metallic yet haha
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