my car gave birth, mystery bolt - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

7thgear · 08-24-2012, 05:05 PM

So..

I find a bolt today underneath the engine/tranny compartment.

It’s a Subaru bolt, 14mm socket and 20mm long (so relatively short) with an "8" stamped on the head.

The bolt is pristine, no grime, oil or even water stains on it and the thread is fresh, so it wasn't bolted into anything.

So the first two questions that run through my head

1. did someone drop a spare bolt in the engine compartment after they put all lower panels on and just said fuck it

2. did someone drop a bolt that they were installing and then said fuck it after they dropped it

Now, I'm at 3000km and had some bumpy rides, along with 2 autocrosses and a track day so I'm curious why it wouldn't have freed itself earlier.. but weirder things have happened

My main concern now is how to cross refrence all the bolts that are 14mm socket and 20mm in length with an "8" stamped on them with all such bolts that are used in the engine/tranny area of the car.

Fucked up, ehh?

industrial · 08-24-2012, 05:06 PM

14mm is pretty big. That would worry me.

Calum · 08-24-2012, 05:16 PM

Grade 8 is an SAE standard not a metric one. For a metric bolt I would expect to see 8.8 or something similar. I don't mean to be condescending but I've gotta ask, are you sure it's not 9/16 x 3/4 inches?

2forme · 08-24-2012, 05:27 PM

What did you name it? Just kidding. 8 is an SAE grade. You should take it to the auto parts store and use the thread display to check.

Hix · 08-24-2012, 05:28 PM

Mine gave birth to some of the larger plastic clips. Never used clips, like no scoring or anything. I checked the liner and the tray under the car and nothing looks to be missing or feels loose

mattles · 08-24-2012, 05:52 PM

the problem Ive found is that when you are working top side on this car and you drop something, itll get trapped between the headers and the heatshield/undertray and I cant be arsed to remove the undertray to untrap objects that fall down there.
Im sure thats what has happened in this case.

Dimman · 08-24-2012, 05:59 PM

Grade 8 bolts have 6 triangle marks on them, not the number 8.

Is it 8.8 on it?

ayau · 08-24-2012, 06:02 PM

i guess you'll find out if it's important or not in the next 500 miles lol.

celica73 · 08-24-2012, 06:15 PM

Sounds exactly like a bolt that would hold the caliper bracket to the hub assembly.

I'm not saying it is, but I'd check those. Any chance you did a brake pad/rotor swap at any point?

7thgear · 08-24-2012, 06:59 PM

lol, no, the calipers are in place solid and i haven't touched the car at all

there is an 8 stamped on the head.. for any reference you guys can pop your hood an look at all the bolts holding various thing sin place and you'll see a few of them have 6 and some have 8 stamped on them.

Bonburner · 08-24-2012, 07:07 PM

I found a small yellow plastic clip with lots of grease on it ..
Been meaning to find out where the heck it came from :/

celica73 · 08-24-2012, 07:31 PM

Quote:

Originally Posted by 7thgear

lol, no, the calipers are in place solid and i haven't touched the car at all

there is an 8 stamped on the head.. for any reference you guys can pop your hood an look at all the bolts holding various thing sin place and you'll see a few of them have 6 and some have 8 stamped on them.

Might still check the bolts - they fit your description pretty well. It could also be something that holds an accessory bracket onto the engine block (AC, alternator, etc), or a motor/transmission mount.

so26 · 08-24-2012, 09:02 PM

Did you have your oil changed recently? It sounds about the same size as the oil pan plug.

08-24-2012, 05:05 PM	#1
7thgear i'm sorry, what? Join Date: Jan 2012 Drives: Canada Location: I rock a beat harder than you can beat it with rocks Posts: 4,399 Thanks: 357 Thanked 2,508 Times in 1,268 Posts Mentioned: 40 Post(s) Tagged: 3 Thread(s)	my car gave birth, mystery bolt So.. I find a bolt today underneath the engine/tranny compartment. It’s a Subaru bolt, 14mm socket and 20mm long (so relatively short) with an "8" stamped on the head. The bolt is pristine, no grime, oil or even water stains on it and the thread is fresh, so it wasn't bolted into anything. So the first two questions that run through my head 1. did someone drop a spare bolt in the engine compartment after they put all lower panels on and just said fuck it 2. did someone drop a bolt that they were installing and then said fuck it after they dropped it Now, I'm at 3000km and had some bumpy rides, along with 2 autocrosses and a track day so I'm curious why it wouldn't have freed itself earlier.. but weirder things have happened My main concern now is how to cross refrence all the bolts that are 14mm socket and 20mm in length with an "8" stamped on them with all such bolts that are used in the engine/tranny area of the car. Fucked up, ehh? __________________ don't you think if I was wrong, I'd know it?

08-24-2012, 05:52 PM	#6
mattles Proud of FR Layout Join Date: Jan 2012 Drives: 2013 Scion FR-S 6MT Location: Puget Sound, WA Posts: 984 Thanks: 101 Thanked 381 Times in 228 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	the problem Ive found is that when you are working top side on this car and you drop something, itll get trapped between the headers and the heatshield/undertray and I cant be arsed to remove the undertray to untrap objects that fall down there. Im sure thats what has happened in this case. __________________ --Matt // Flickr \\ Instagram

08-24-2012, 06:59 PM	#10
7thgear i'm sorry, what? Join Date: Jan 2012 Drives: Canada Location: I rock a beat harder than you can beat it with rocks Posts: 4,399 Thanks: 357 Thanked 2,508 Times in 1,268 Posts Mentioned: 40 Post(s) Tagged: 3 Thread(s)	lol, no, the calipers are in place solid and i haven't touched the car at all there is an 8 stamped on the head.. for any reference you guys can pop your hood an look at all the bolts holding various thing sin place and you'll see a few of them have 6 and some have 8 stamped on them. __________________ don't you think if I was wrong, I'd know it?

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08-24-2012, 05:06 PM	#2
industrial Add lightness! Join Date: Apr 2012 Drives: 17' WRX Location: Boston Posts: 1,253 Thanks: 380 Thanked 888 Times in 411 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	14mm is pretty big. That would worry me.

08-24-2012, 05:16 PM	#3
Calum That Guy Join Date: Dec 2011 Drives: 2013 asphalt FRS MT Location: Halifax, Nova Scotia Posts: 4,865 Thanks: 5,058 Thanked 2,868 Times in 1,499 Posts Mentioned: 82 Post(s) Tagged: 1 Thread(s)	Grade 8 is an SAE standard not a metric one. For a metric bolt I would expect to see 8.8 or something similar. I don't mean to be condescending but I've gotta ask, are you sure it's not 9/16 x 3/4 inches?

08-24-2012, 05:28 PM	#5
Hix Senior Member Join Date: Jun 2012 Drives: 2017 WRB PP Location: Houston Posts: 423 Thanks: 65 Thanked 126 Times in 82 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	Mine gave birth to some of the larger plastic clips. Never used clips, like no scoring or anything. I checked the liner and the tray under the car and nothing looks to be missing or feels loose

08-24-2012, 06:02 PM	#8
ayau Senior Member Join Date: Nov 2011 Drives: Some rust bucket Location: Polar ice cap Posts: 3,058 Thanks: 312 Thanked 1,046 Times in 556 Posts Mentioned: 37 Post(s) Tagged: 0 Thread(s)	i guess you'll find out if it's important or not in the next 500 miles lol.

08-24-2012, 06:15 PM	#9
celica73 Senior Member Join Date: Jun 2012 Drives: '13 BRZ / '11 Outback / '06 Tundra Location: Durham NC Posts: 510 Thanks: 6 Thanked 155 Times in 104 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Sounds exactly like a bolt that would hold the caliper bracket to the hub assembly. I'm not saying it is, but I'd check those. Any chance you did a brake pad/rotor swap at any point?

08-24-2012, 09:02 PM	#13
so26 Senior Member Join Date: Aug 2012 Drives: Raven FR-S 6MT Location: Garden state Posts: 181 Thanks: 70 Thanked 54 Times in 22 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Did you have your oil changed recently? It sounds about the same size as the oil pan plug.

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