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Old 11-11-2020, 09:49 PM   #1
Jp925
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Default Calling All EJ257 Owners! HELP!!!!

I'm going to try and keep this short, I'm not looking to be lectured or to be told everything else that could be wrong, I'm just trying to figure out why for the time being; here we go.

Car is a 2006 sti, 580 miles ago had a full rebuild with forged components and hardware. This includes pistons, rods, head studs, master gasket kit, full valve job, timing belt, water pump, and all other items you do with a rebuild.

Today I hopped in the car, let is idle for :45-1 minute, then started on my way.

30 seconds later I hopped onto the main road, went 1st, 2nd, and shifted into 3rd at 4500ish, shifted into 4th and the car died upon going into gear, I coasted to the side of the road, tried to restart and it just cranked.

checked fuel, spark, and ECU, all good.

Pulled the timing cover off to find my driver side intake cam has slipped 180 degrees out!

removed the belt, checked all the idlers, checked the tensioner, checked all the cams, and of course rotated everything by hand.

I have to be missing something right? I used an AISIN kit purchased from Amazon sold and shipped by Amazon, tensioner piston is not wet, no bearings are broken, and all gears have all sprockets intact.

Can anyone shed any light on what could have possibly happened here?



And for those of you wondering, I put the motor back into time, with the old belt and tensioner and it fired up, it turned over and idled without any concern I could hear. I will be doing a leak down test to see if there's anything that was hurt; but I'm just trying to get to the bottom of what happened right now.
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Old 11-12-2020, 07:56 AM   #2
horsePOOGAS
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Someone correct me if I'm wrong... I would have thought that with the timing being out that far after slipping - your pistons would have had a conversation with your valves, being that these engines are interference engines. So I'm surprised that re-timing it that it even started back up.

Have you driven it since getting it back together?
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Old 11-12-2020, 01:46 PM   #3
Jedi03
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if OP was lucky it would have just not been able to create compression thus the shutoff...dunno what could have happened to create 180 degree...thats alot of slip..
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Old 11-12-2020, 02:27 PM   #4
BlackFighter
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Could have been the AISIN kit tensioner. Thats why I use gates. Only thing i can think of.
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Old 11-12-2020, 02:56 PM   #5
Jp925
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Quote:
Originally Posted by BlackFighter View Post
Could have been the AISIN kit tensioner. Thats why I use gates. Only thing i can think of.
is Gates back in the US? All fingers point to just a bunk Tensioner... I just can't believe it failed like this. I also don't understand why it still is tensioned.

Last edited by Jp925; 11-12-2020 at 03:11 PM.
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Old 11-12-2020, 04:36 PM   #6
GK1707
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Quote:
Originally Posted by BlackFighter View Post
Could have been the AISIN kit tensioner. Thats why I use gates. Only thing i can think of.
Is gates good again I've heard mixed things? On the flip side I've always used aisin parts with good success in the past. Many of them are made in Japan. I'm surprised this tensioner failed so badly.
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Old 11-12-2020, 05:58 PM   #7
Jp925
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Quote:
Originally Posted by GK1707 View Post
Is gates good again I've heard mixed things? On the flip side I've always used aisin parts with good success in the past. Many of them are made in Japan. I'm surprised this tensioner failed so badly.
I've read several articles about AISIN being the direct OEM supplier. I'm just not sure what to make of this horrible failure.
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Old 11-13-2020, 12:37 AM   #8
DrD
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Are all of the belt guides in place?
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Old 11-13-2020, 12:47 AM   #9
Jp925
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Quote:
Originally Posted by DrD View Post
Are all of the belt guides in place?
Yep, and still tight.
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Old 11-13-2020, 08:41 AM   #10
GK1707
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Quote:
Originally Posted by Jp925 View Post
I've read several articles about AISIN being the direct OEM supplier. I'm just not sure what to make of this horrible failure.
This is true. Aisin manufactures almost every Toyota transmission along with transmissions for many other car manufacturers.

Majority of aisin off the shelf parts are made in Japan or USA. I was strongly considering them over gates for my next timing belt change so seeing this is making me wonder the root cause of OPs issue since typically the quality of Aisin parts are not questionable.
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Old 11-13-2020, 10:29 AM   #11
Jp925
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Quote:
Originally Posted by GK1707 View Post
This is true. Aisin manufactures almost every Toyota transmission along with transmissions for many other car manufacturers.

Majority of aisin off the shelf parts are made in Japan or USA. I was strongly considering them over gates for my next timing belt change so seeing this is making me wonder the root cause of OPs issue since typically the quality of Aisin parts are not questionable.
Ordered the gates kit and will update tomorrow.
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Old 11-13-2020, 10:52 AM   #12
Jp925
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Has anyone with any timing belt they’ve ever bought received “bleeding” instructions? How many subie guys out there bleed their tensioners before install?
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