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Old 05-16-2013, 05:02 PM   #1
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Default M-tune reroute sealing question

For the heater hose nipple and sensor(s) which is the preferred method:

Teflon tape or teflon paste?

I have the please of doing this with the engine out of the car. I really really really do not want to fix leaks once this engine is in the car. Any other suggestions/tips aside from making sure the t-stat seal is seated in the housing?

-Zach
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Old 05-16-2013, 05:36 PM   #2
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The begi reroute recommended permatex. i used the original permatex, which is permatex 1.

NO IDEA how it seals yet, but i'd be very surprised if it leaked from anywhere i sealed with this ****.
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Old 05-16-2013, 05:39 PM   #3
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Quote:
Originally Posted by Fireindc View Post
The begi reroute recommended permatex. i used the original permatex, which is permatex 1.

NO IDEA how it seals yet, but i'd be very surprised if it leaked from anywhere i sealed with this ****.
I know on my begi, the only place it doesnt leak is the threads where I used teflon tape. Just made sure to not put them on the first couple so its less likely to get pulled into the coolant system. But, **** the paper gaskets sideways with a circular saw blade.
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Old 05-16-2013, 06:27 PM   #4
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Quote:
Originally Posted by Leafy View Post
I know on my begi, the only place it doesnt leak is the threads where I used teflon tape. Just made sure to not put them on the first couple so its less likely to get pulled into the coolant system. But, **** the paper gaskets sideways with a circular saw blade.
I'm pretty damn sure I wont have any issues with the permatex, those threads were sealed and the stuff hardens up quite a bit when it dries. Plus it's made for **** like that.

The paper gaskets on the other hand you have me concerned about. I didn't put any RTV or anything on them, and torqued them tight and evenly as recommended.

I'll be so angry if they leak, lol. Such a PITA to get back there.
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Old 05-16-2013, 08:37 PM   #5
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I used Permatex thread sealant. I also used dry Mazda OEM thermostat gaskets on both sides of the BEGI spacer. Torqued evenly by the book. No leaks whatsoever.
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Old 05-17-2013, 02:18 PM   #6
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I stopped using parts store gaskets a while ago. I've NEVER had a "stick-on" gasket ever work properly on any application I've ever been unfortunate enough to try it on.

Quote:
Originally Posted by hornetball View Post
I also used dry Mazda OEM thermostat gaskets on both sides of the BEGI spacer
+1 on OEM Mazda gaskets too. If I'm feeling particularly saucy, Permatex RTV (or Hylomar) FTW
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Old 05-17-2013, 02:32 PM   #7
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Quote:
Originally Posted by EO2K View Post
I stopped using parts store gaskets a while ago. I've NEVER had a "stick-on" gasket ever work properly on any application I've ever been unfortunate enough to try it on.



+1 on OEM Mazda gaskets too. If I'm feeling particularly saucy, Permatex RTV (or Hylomar) FTW
I am using Fel Pro gaskets for both sides of my BEGI spacer and have not had any issues. They were not stick on ones though, just a pain in the *** to get all aligned behind the head with the engine in the car.
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Old 05-17-2013, 04:17 PM   #8
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I figured if BEGI included them in their kit, then they should work. I probably shouldn't assume. Time will tell, hopefully getting her running this weekend.
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Old 05-17-2013, 05:39 PM   #9
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For threads, tape. Easier, less messy, seals better.

For gaskets, I always use Indian Head shellac. Dad used it for years, never any problems, so I continued with what works. One bottle will last you a lifetime.
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Old 05-17-2013, 05:43 PM   #10
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The instruction says to use teflon tape for the ports... however the barb with an o-ring....nothing was mentioned

http://www.949racing.com/mtuned/M-Tu...route_Inst.pdf
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Old 05-21-2013, 07:38 AM   #11
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Paste. Everywhere we tried Teflon tape didn't take long to start leaking. Paste has been good after multiple track days.

YMMV
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Old 05-21-2013, 10:27 AM   #12
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Teflon paste? I forgot that stuff existed. Good call...
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Old 05-21-2013, 10:58 AM   #13
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That's what the Permatex thread sealant is.
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Old 05-21-2013, 11:41 AM   #14
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Just to throw another opinion in, I've been using some yellow goop sold for sealing steam pipes I picked up at Lowes. Sort of like the teflon paste but says it's designed for high heat applications, and stays fairly soft for a very long time. I've never had a problem with it leaking on coolant or oil ports.

As for the gaskets, I just used autoparts store paper gaskets with a thin layer of RTV and haven't ever had a problem. I've always used this approach for all coolant system paper gaskets.
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Old 05-21-2013, 03:28 PM   #15
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Quote:
Originally Posted by hornetball View Post
That's what the Permatex thread sealant is.
This stuff?

I friggin' love this stuff.

Quote:
Originally Posted by baron340 View Post
Just to throw another opinion in, I've been using some yellow goop sold for sealing steam pipes I picked up at Lowes. Sort of like the teflon paste but says it's designed for high heat applications, and stays fairly soft for a very long time. I've never had a problem with it leaking on coolant or oil ports.
I used to use the version of this yellow stuff that comes on a roll. It's the only thing I've seen that specifically states that its oil/water/fuel safe, other than the above sealant. Looks like this:



Works great, but I prefer the Permatex product on anything other than stainless these days. For stainless, I still use the tape. There seems to be far less galling on SS threads
Attached Thumbnails
M-tune reroute sealing question-0000-permatex-high-temperature-thread-sealant.jpg  
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Old 05-21-2013, 04:20 PM   #16
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Quote:
Originally Posted by EO2K View Post
This stuff?
Yep.
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Old 05-21-2013, 05:13 PM   #17
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I used this stuff:



Will report back when the car has seen some miles. Seems like it sealed good though from looking at it, lol.
Attached Thumbnails
M-tune reroute sealing question-permatex_80007_15_oz_hardening_form-gasket_no_1_sealant.jpg  
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Old 05-21-2013, 10:03 PM   #18
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Fireindc, that's the equivalent of the Indian Head shellac. Different brand is all.
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