Thremostat Housing Bolt Broke!!!!!!!!!

Guero

Active Member
Oct 11, 2005
2,148
0
47
Yep as it says!!!!!I was gonna start to put back my radiotor and stuff..and I put the Housing on and the bolts!! And as I was tighten it it broke...I wasnt even doing it hard I guess it was just corroded!!!!! How the **** can I take if off with out taking the intake of??
 
How far down the bolt did it break? If just under the head, when you remove the stat housing you might be able to get vice grips on the shank and remove it.
 
To add to JT's advice, if the vice grips won't work...

Remove the housing (if the bolt is sticking out a bit) and grind a slot in the t-stat bolt, and remove with a screwdriver.

A new t-stat bolt should be:

5/16-18 x 3.50”
 
In that particular application .......
you got three things working against you :(

1) Steel bolt
2) Aluminum threads
3) Water in contact with 1 & 2

A N Y time you got a steel bolt in an Aluminum part ........

You wanna use anti seize to keep the corrosion to a minimum :Word:

It happens cause you got dissimilar metals together and you see
that white gunky stuff which can make the two metals become like
they have been welded together.

The water being present only makes the whole thing all the more worse :bang:

I'd bet all the above is what caused your bolt to snap :)

Get it all cleaned up and do the anti seize thing ;)

Grady
 
Very good advice above (David's is right-on, and Grady's talk about galvanic corrosion is spot-on!).

Anyone seen a tiny chisel that would fit for him? I dont think I have. I'd even take a narrow flat-head screwdriver and see if you can get it to catch and turn it. Guero's a madman so I won't suggest using an impact driver (where you hammer on the head and it spins the bolt out). An EZ out might work but don't break the drill bit or the EZ out.
 
an easy out is a twisted splined bit that is used to extract bolts in your situation.
only problem with these is that you have to have a hole to insert the extractor in, so you have to drill a hole being very very carefull to only make the hole inside the broken bolt and not into the intake. once you obtain a set of easy outs you
drill a hole that is about 3/4 the diamater of the bolt right into the center of it only about 1/2" deep in your situation. then you take the easy out that just barely fits inside the hole you drilled and lightly tap it to get a good bite. then take a wrench
and turn it out and hope for the best. hope this helps man. thats a real bad
situation to be in.
 
An EZ out is a left-handed, tapered shank. You drill a pilot hole and start threading the EZ out into the hole. Because it threads in with left-handed threads, as it gets tight, it starts to unscrew your broken bolt.

EDIT, Aamwebb posted good stuff while I loaded the page. :nice:
 
As I was thinking about a solution :scratch:

I realized I should have listed a fourth thing that may have caused that
bolt to become frozen in your intake.

Gasket Sealer

I rarely use the stuff but it can easily get on the bolt threads and then
be transmitted to the intake threads.

Sooooo ... it may be just one more thing holding that bolt in place

The first thing I'd do is use Liquid Wrench, PB Blaster, or something
similar to see if you can get it to follow the threads and go down into
the intake.

Soak in down several times
Tap around on the bolt a bit to shake things up
Might even heat up the bolt a time or two

Also ... Soak it down from the back side of the hole ... if possible ;)

Anyway ... try and see if all the above will help free up things a bit

Like JT said ... chisel or punch might allow you to get it turning :shrug:

But if it don't work ..........

Be very careful and put yourself a hole in the Exact center of the bolt
and try to extract it with an EZ Out

DO NOT ... break off the EZ Out :nono:

If worse comes to worse ...........
You'll just have to go larger in tiny steps with the hole until you can peal
out the remains of the blot ... thus ... the importance of drilling the first
hole in the exact center of the bolt.

Good Luck Mr. G :nice:

Grady
 
Final I installed a brand new intake so there was nothing in the thread...I saw the bolt was kinda dirty so I just cleaned it of and thought nothing of it......Till bam the head fell out and about 1/2 inch of the bolt!!!
 
Sears sells this nifty little tool set that I have used to get many many many broken bolts out (Nissan exhaust manifold studs snap like pretzels).

They are a reverse drill bit on one side (which often removes the broken bolt as you drill it). You only need to drill to the shoulder of the bit (1/4 inch) then you flip it over and it's a "EZ outish" type of tool that you stick in the hole you just made and it grabs it and spins it out. Seriosly, I've snapped or stripped a bunch of stuff and these haven't let me down yet. The key is to center punch the bolt and use lots of PB blaster. I think they are called "Drill Outs" and I think "Deck outs" are the same thing. It's the deck outs that I've used

http://www.sears.com/shc/s/p_10153_...Tools&cName=Mechanics+Tools&sName=Taps+&+Dies