coolant pipe drain plug thread size. (Page 2/3)
AL87 FEB 07, 07:17 AM

quote
Originally posted by Fierobsessed:

1/8" NPT.

In my experience, I remove mine by inserting the largest hex key that will fit, and I will pry it around in all directions to widen the hole until I can fit the correct 3/16" hex key. Then it comes out without too much trouble. They are a blessing when you are draining coolant for removing the cradle



Arent Fieros supposed to be GM metric vehicles?
I used a 5mm.
olejoedad FEB 07, 07:56 AM

quote
Originally posted by VikingRedBaron:


If the plug rusted out, how good is whats left of the pipe?



The coolant tubes are stainless steel and very corrosion resistant. The plugs are not stainless and would corrode much more quickly. Poor coolant servicing will set up a corrosive environment in the cooling system that will attack the plug from the inside.
AL87 FEB 07, 01:08 PM

quote
Originally posted by olejoedad:


The coolant tubes are stainless steel and very corrosion resistant. The plugs are not stainless and would corrode much more quickly. Poor coolant servicing will set up a corrosive environment in the cooling system that will attack the plug from the inside.



My friend was trolling me*
VikingRedBaron FEB 07, 07:46 PM

quote
Originally posted by AL87:


My friend was trolling me*



Who you calling a troll boy?
Spoon FEB 07, 08:43 PM
Wanna have some real fun the next time you need to remove the plugs, try some of these.

http://www.ebay.com/itm/MCS...AOSwUUdXD34t&vxp=mtr
Spoon


------------------
"Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne." - Kurt Vonnegut

[This message has been edited by Spoon (edited 07-23-2017).]

KoolKiwi MAY 08, 06:11 AM

quote
Originally posted by Fierobsessed:

1/8" NPT.

In my experience, I remove mine by inserting the largest hex key that will fit, and I will pry it around in all directions to widen the hole until I can fit the correct 3/16" hex key. Then it comes out without too much trouble. They are a blessing when you are draining coolant for removing the cradle



In case it helps anyone... I bought a couple of new drain plugs from the Fiero Store, and they were 3/16" hex key.

So on this basis I used a 3/16" hex key to try and remove the old plugs. This resulted in me rounding off the hex key and stripping / damaging the existing plugs, which still wouldn't budge. As the old plugs were gunked up, it was difficult to see, but the 3/16" hex key seemed to be a tight fit.

After thinking this through, I thought that the only way it would have stripped the hex key is of it wasn't the correct size / tool. After really close inspection, I discovered that it was actually Torx. So even though the plug was now stripped / damaged, I tried a T30 Torx and it fitted tightly and I was then able to unscrew the plug.

So it appears that although the replacement plugs from the Fiero Store are 3/16" hex key, the original plugs in my 85' Fiero GT 2.8 were actually Torx.

Hopefully this helps someone who is struggling to get their original plugs out with a hex key.
Quad4 JUL 08, 06:17 PM

quote
Originally posted by AL87:

Also, wondering if there is a dorman/help assortment or something I could get. I cant afford to wait for shipping of OE reproduction parts.



I got a couple of these from the plumbing section of my local hardware store. They fit fine. They were only $1.50 or so at the store.

https://www.amazon.com/ANDE...ersink/dp/B00826MN6S
cvxjet JUL 08, 09:49 PM
Memo for the day; If you can, when you go to the JY to get some parts, snag the plugs if you can get them out...I have a double set of spares...I should probably have another...And mine are 3/16" allen- 1985 SE V-6...
Dennis LaGrua JUL 08, 09:59 PM
Would not a standard brass 1/8 NPT pipe plug work? Any Loews or Home Depot Should have them. Being that it has a sq or hex end, they should be a breeze to remove.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

FieroG97J JUL 10, 04:57 PM

quote
Originally posted by tesmith66:

I can't believe you got the plug out. I have tried several, and ended up stripping the head out every time.



I've taken a bunch of them out and never stripped one yet. Are you using a 3/16" hex key?

[This message has been edited by FieroG97J (edited 07-10-2017).]