Engine Damage Pics Need Advice - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

O Haiii · 05-06-2022, 03:46 PM

Long story short, one of our daily drivers was run without any oil. Dealer sent over pictures, but I am not knowledgeable enough to know what they show. Please let me know what damages you see. Dealer says cylinder wall pictured shows scoring, and the timing of the engine was completely thrown off. Dealer is giving us two options: 1. Access the variable timing "pins". If it's broken, replace and set it straight, and go from there hoping that nothing else is broken and the scoring cylinder wall doesnt pose other problems. 2. Replace engine completely.

What would be the best course of action? Please advise. Thank for any help.

Ultramaroon · 05-06-2022, 04:29 PM

Quote:

Originally Posted by O Haiii

What would be the best course of action? Please advise. Thank for any help.

User ban is appropriate in this case. Reported.

soundman98 · 05-06-2022, 08:41 PM

Quote:

Originally Posted by Ultramaroon

User ban is appropriate in this case. Reported.

i'm not following

Ultramaroon · 05-06-2022, 09:02 PM

Quote:

Originally Posted by soundman98

i'm not following

Look at the date stamp on the bore scope display

soundman98 · 05-07-2022, 01:08 AM

Quote:

Originally Posted by Ultramaroon

Look at the date stamp on the bore scope display

Don't ever look through my Flickr account.

My borescope and thermal camera do the same thing. Damn battery hogs, I don't use them all the time, so I yank the batteries when not in use. I'm not made of AA's! And of course, it's a 20 minute process to reset the time/date. I usually only do it if there's a serious problem I need to document.

Like cylinder walls.

Same with my digital calipers

None of the OP's other posts read like spam...

soundman98 · 05-07-2022, 01:13 AM

How many miles are on the motor?

Motors don't just jump timing for fun, I suspect it's a deeper problem. But I would also reset timing and hope for the best because if it's already FUBARed, a little extra effort for the cheap rout isn't going to make it any more dead.

Ultramaroon · 05-07-2022, 01:52 AM

Quote:

Originally Posted by soundman98

None of the OP's other posts read like spam...

I disagree but I'm ready to be wrong.

edit: Ok, I'm wrong. I apologize, O Haiii. Went back to read more of the earlier threads. I say fix timing and do a compression test to rule out bent valves. If it checks good, run it. If it doesn't start knocking with a bad rod bearing, you got lucky.

bcj · 05-07-2022, 02:03 AM

Don't think it's a boxer.
Some more details like ID numbers from the block, make and model would help to research similar engine failure modes.

WolfpackS2k · 05-09-2022, 11:43 AM

I'm not an mechanical expert (but also a novice) but how could running on low/no oil cause timing to jump?

NoHaveMSG · 05-09-2022, 12:42 PM

Quote:

Originally Posted by WolfpackS2k

I'm not an mechanical expert (but also a novice) but how could running on low/no oil cause timing to jump?

Hydraulic tensioner possibly

Ultramaroon · 05-09-2022, 12:48 PM

Quote:

Originally Posted by NoHaveMSG

Hydraulic tensioner possibly

I was thinking the same but they all have ratchets. Maybe slipped with vibration. Already loose because high mileage/worn guides?

KillerBMotorsport · 05-09-2022, 01:15 PM

How many miles are on this engine?

I would expect bearing failure long before bore scoring on these engines.

As far as the timing chain jumping a tooth, you have no way of knowing that from the pics here. In theory a worn chain, guides and tensioner could do it, but you'd need a bazillion miles. The timing mark you're showing is the factory timing indicator for ignition. It's used at the factory, but otherwise is next to useless, you don't 'change' timing on these cars like you did back in the day with a distributor. These cars are modern and have a crank position sensor that feeds the ECU so it can determine optimal spart timing. There are also Cam position sensors. If any of these sensors detect something not as it should be, you throw a CEL.

Did you have an active Check Engine Light on the dash?

NoHaveMSG · 05-09-2022, 04:38 PM

Quote:

Originally Posted by Ultramaroon

I was thinking the same but they all have ratchets. Maybe slipped with vibration. Already loose because high mileage/worn guides?

I was thinking that too but only thing that came to mind.

NoHaveMSG · 05-09-2022, 04:42 PM

Quote:

Originally Posted by KillerBMotorsport

Did you have an active Check Engine Light on the dash?

05-06-2022, 03:46 PM	#1
O Haiii Member Join Date: Jan 2022 Drives: Toyota Tercel Location: CA Posts: 11 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 1 Post(s)	Engine Damage Pics Need Advice Long story short, one of our daily drivers was run without any oil. Dealer sent over pictures, but I am not knowledgeable enough to know what they show. Please let me know what damages you see. Dealer says cylinder wall pictured shows scoring, and the timing of the engine was completely thrown off. Dealer is giving us two options: 1. Access the variable timing "pins". If it's broken, replace and set it straight, and go from there hoping that nothing else is broken and the scoring cylinder wall doesnt pose other problems. 2. Replace engine completely. What would be the best course of action? Please advise. Thank for any help.

05-07-2022, 01:13 AM	#6
soundman98 ProCrastinationConsultant Join Date: Sep 2013 Drives: '14 Ranger, '18 Tacoma 4Dr LB Location: chicago-ish Posts: 11,327 Thanks: 35,240 Thanked 13,677 Times in 6,782 Posts Mentioned: 98 Post(s)	How many miles are on the motor? Motors don't just jump timing for fun, I suspect it's a deeper problem. But I would also reset timing and hope for the best because if it's already FUBARed, a little extra effort for the cheap rout isn't going to make it any more dead. __________________ "The time you enjoy wasting is not wasted time"

05-07-2022, 02:03 AM	#8
bcj Geo Tyrebighter Esq Join Date: Mar 2013 Drives: '13 scion fr-s Location: pnw Posts: 4,324 Thanks: 6,780 Thanked 5,270 Times in 2,296 Posts Mentioned: 43 Post(s)	Don't think it's a boxer. Some more details like ID numbers from the block, make and model would help to research similar engine failure modes. __________________ -- "I gotta rock." -- Charley Brown

05-09-2022, 11:43 AM	#9
WolfpackS2k Senior Member Join Date: Aug 2011 Drives: '12 C63 P31, '23 GRC Location: NC Posts: 3,215 Thanks: 2,951 Thanked 2,082 Times in 1,193 Posts Mentioned: 19 Post(s)	I'm not an mechanical expert (but also a novice) but how could running on low/no oil cause timing to jump? __________________ Current: 2023 GRC Circuit Edition, 2012 C63 AMG P31 Past: (2) 2000 MR2 Spyder, 2017 GTI Sport, 2006 Porsche Cayman S, Supercharged 2013 BRZ-L, 2007 Honda S2000, 1992 Integra GS-R

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05-09-2022, 01:15 PM	#12
KillerBMotorsport Join Date: Apr 2021 Drives: BRZ Location: Virginia Posts: 568 Thanks: 89 Thanked 711 Times in 325 Posts Mentioned: 16 Post(s)	How many miles are on this engine? I would expect bearing failure long before bore scoring on these engines. As far as the timing chain jumping a tooth, you have no way of knowing that from the pics here. In theory a worn chain, guides and tensioner could do it, but you'd need a bazillion miles. The timing mark you're showing is the factory timing indicator for ignition. It's used at the factory, but otherwise is next to useless, you don't 'change' timing on these cars like you did back in the day with a distributor. These cars are modern and have a crank position sensor that feeds the ECU so it can determine optimal spart timing. There are also Cam position sensors. If any of these sensors detect something not as it should be, you throw a CEL. Did you have an active Check Engine Light on the dash?

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