Timing chain sprocket tooth broke - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Jamesallen45 · 08-09-2018, 03:18 PM

Is this a common problem? Had complete engine tear down and reassemble with high quality parts less than a year ago. I do not believe in coincidences...less than 50k miles and a tooth breaks off of sprocket? Is this incompetence from a shop that has never done an FRS/BRZ before or is this a common problem. Any info. is greatly appreciated.

Lonewolf · 08-09-2018, 07:39 PM

I've been here for years and have not yet heard of this happening once...hmmm

humfrz · 08-09-2018, 08:08 PM

Well now, that's a shame -

I've not heard of this problem before on this car on this forum.

If the engine were not put back together properly, I doubt it would have run for a year.

Even if the chain tensioner got slacked off to the point where the chain jumped the sprocket, it would be unusual for it to break a tooth off the sprocket, unless it jammed inside the housing.

Do you have any pictures of the damage?

humfrz

stevesnj · 08-09-2018, 08:28 PM

Was the sprocket NOT an OEM part?

dutchman1 · 08-09-2018, 10:06 PM

Tooth breaking off is weird. Normally indicates a casting or heat treating issue on the gear, assuming it was a clean break.

Do you have a picture of the damage?

Jamesallen45 · 08-23-2018, 01:43 PM

Thank you all for the replies. Sorry for such a delay in responding. The entire situation feels horribly hopeless. No one ever has the courage to take responsibility and do the right thing any more.
Nothing can be proven for sure, but you can ask what is the mostly likely explanation...An unheard of problem occurring or something went wrong during the assembly process by a shop who has never done a subaru motor before causing failure after less than 10k miles. Even if nothing can be proven, a business should be smart enough to know that potential damage to their reputation is at stake. They should at least try to work with you.

Everything in the motor is OEM except the pistons, rods, and bearings. And the car has an oil cooler and sump system.
A tooth breaking off of a timing sprocket is unheard of among the members of this forum, but this is what the shop is saying that caused the catastrophic failure. Classic example of deflection of responsibility...blame it on something they did not do. Problem is...they did everything in that motor.
Again, I do appreciate everyone's help

Tcoat · 08-23-2018, 02:00 PM

Is the car FI?

Nevermind.
https://www.ft86club.com/forums/show...=127968&page=2

You never did tell us what was wrong with the car before. It could be related.

finch1750 · 08-23-2018, 02:03 PM

Quote:

Originally Posted by Jamesallen45

Thank you all for the replies. Sorry for such a delay in responding. The entire situation feels horribly hopeless. No one ever has the courage to take responsibility and do the right thing any more.
Nothing can be proven for sure, but you can ask what is the mostly likely explanation...An unheard of problem occurring or something went wrong during the assembly process by a shop who has never done a subaru motor before causing failure after less than 10k miles. Even if nothing can be proven, a business should be smart enough to know that potential damage to their reputation is at stake. They should at least try to work with you.

Everything in the motor is OEM except the pistons, rods, and bearings. And the car has an oil cooler and sump system.
A tooth breaking off of a timing sprocket is unheard of among the members of this forum, but this is what the shop is saying that caused the catastrophic failure. Classic example of deflection of responsibility...blame it on something they did not do. Problem is...they did everything in that motor.
Again, I do appreciate everyone's help

The company that makes the sprocket doesn't have a warranty of any kind?

Ultramaroon · 08-23-2018, 02:32 PM

Quote:

Originally Posted by Jamesallen45

Everything in the motor is OEM except the pistons, rods, and bearings.

guybo · 08-28-2018, 05:24 AM

Quote:

Originally Posted by Jamesallen45

Everything in the motor is OEM except the pistons, rods, and bearings. And the car has an oil cooler and sump system.

LOL, basically stock.

08-09-2018, 03:18 PM	#1
Jamesallen45 Junior Member Join Date: May 2018 Drives: 2013 FRS Location: Canton, GA Posts: 6 Thanks: 0 Thanked 2 Times in 1 Post Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Timing chain sprocket tooth broke Is this a common problem? Had complete engine tear down and reassemble with high quality parts less than a year ago. I do not believe in coincidences...less than 50k miles and a tooth breaks off of sprocket? Is this incompetence from a shop that has never done an FRS/BRZ before or is this a common problem. Any info. is greatly appreciated.

08-09-2018, 08:28 PM	#4
stevesnj Senior Member Join Date: May 2013 Drives: 2016 FR-S Oceanic Blue Location: Southern NJ Posts: 2,958 Thanks: 2,158 Thanked 1,601 Times in 923 Posts Mentioned: 30 Post(s) Tagged: 2 Thread(s)	Was the sprocket NOT an OEM part? __________________ My 2016 Build thread TRD Exhaust with custom quad tips, TRD Lowering Springs,TRD Quick shifter,LED;DRL, Projectors, and turn signals. Re-badge, 86 Nanny, WinmaxW2 Pads, K&N Drop In, Antenna delete

08-09-2018, 10:06 PM	#5
dutchman1 Senior Member Join Date: Nov 2016 Drives: 2017 86 6-Speed Location: Seattle Posts: 138 Thanks: 35 Thanked 74 Times in 36 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Tooth breaking off is weird. Normally indicates a casting or heat treating issue on the gear, assuming it was a clean break. Do you have a picture of the damage? __________________ 2017 86 set up for CS STX autocross

08-23-2018, 02:00 PM	#7
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,841 Thanks: 61,656 Thanked 108,295 Times in 46,456 Posts Mentioned: 2499 Post(s) Tagged: 50 Thread(s)	Is the car FI? Nevermind. https://www.ft86club.com/forums/show...=127968&page=2 You never did tell us what was wrong with the car before. It could be related. __________________ Racecar spelled backwards is Racecar, because Racecar.

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08-09-2018, 07:39 PM	#2
Lonewolf Senior Member Join Date: Dec 2011 Drives: Moped Location: CA Posts: 4,300 Thanks: 4,905 Thanked 2,132 Times in 1,195 Posts Mentioned: 21 Post(s) Tagged: 0 Thread(s)	I've been here for years and have not yet heard of this happening once...hmmm

08-09-2018, 08:08 PM	#3
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 30,432 Thanks: 29,826 Thanked 32,845 Times in 16,844 Posts Mentioned: 715 Post(s) Tagged: 2 Thread(s)	Well now, that's a shame - I've not heard of this problem before on this car on this forum. If the engine were not put back together properly, I doubt it would have run for a year. Even if the chain tensioner got slacked off to the point where the chain jumped the sprocket, it would be unusual for it to break a tooth off the sprocket, unless it jammed inside the housing. Do you have any pictures of the damage? humfrz

08-23-2018, 01:43 PM	#6
Jamesallen45 Junior Member Join Date: May 2018 Drives: 2013 FRS Location: Canton, GA Posts: 6 Thanks: 0 Thanked 2 Times in 1 Post Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Thank you all for the replies. Sorry for such a delay in responding. The entire situation feels horribly hopeless. No one ever has the courage to take responsibility and do the right thing any more. Nothing can be proven for sure, but you can ask what is the mostly likely explanation...An unheard of problem occurring or something went wrong during the assembly process by a shop who has never done a subaru motor before causing failure after less than 10k miles. Even if nothing can be proven, a business should be smart enough to know that potential damage to their reputation is at stake. They should at least try to work with you. Everything in the motor is OEM except the pistons, rods, and bearings. And the car has an oil cooler and sump system. A tooth breaking off of a timing sprocket is unheard of among the members of this forum, but this is what the shop is saying that caused the catastrophic failure. Classic example of deflection of responsibility...blame it on something they did not do. Problem is...they did everything in that motor. Again, I do appreciate everyone's help

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