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#998754 - 03/30/14 01:04 PM Need to insulate a small harness from headers  
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SSLance Offline
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SSLance  Offline
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Peoria, AZ
I've got a small harness with wires that run to the temp sensor, knock sensor, and oil pressure sender in it that runs very close to my driver side header near the oil filter. I can't seem to come up with a way to secure it to the block to hold it in place but in most cases it stays away from the header and does okay.

Over the past year the plastic sheathing it is in has melted away in a section about 2" long where it is closest to the header, but the wires themselves did not get damaged.

I'm trying to come up with a solution to wrap around the harness to protect the wires from the heat but am coming up empty. There really isn't any other way to route it as everything it connects to is also under the header. I can put new sheathing over it again and hope for the best maybe even adding a layer or two of electrical tape, but would like to try something a bit more permanent.

Any suggestions?

Something like the metal tube on the passenger side for the wires coming off of the starter would be great, but there is nothing to attach it to to hold it in place that I can see.

What I'd like is some sort of insulating tape that I could wrap the harness up in...is there such a thing?


Lance
1985 Monte Carlo SS Street Car
#998759 - 03/30/14 02:09 PM Re: Need to insulate a small harness from headers [Re: SSLance]  
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pazzo1969 Online thinking
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hey lance. I use a product from DEI. From what i've put it through i have yet see it fail. Comes in different lengths and diameters. If i couldn' t slide it over and object i just slit it and used ss ties. You can see it in this pic. Pazz


President Wicked Rides/Wicked Montes Georgia chapter
#998761 - 03/30/14 02:40 PM Re: Need to insulate a small harness from headers [Re: SSLance]  
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SSLance Offline
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Thanks, I just found that stuff is available at o'reillys...looks like it'll fit the bill perfectly. Headed out to get some now.

Sounds like it can be formed and hold it's shape too which will also help hold the harness away from the headers.



Lance
1985 Monte Carlo SS Street Car
#998762 - 03/30/14 03:03 PM Re: Need to insulate a small harness from headers [Re: SSLance]  
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SKIDMARK Offline
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New Bern NC
Lance, in the HAVC work I do we use a MASTIC insulation tape it has a foil face on it and sticks real good usually used for sealing seams on duct work. You could wrap the wires with it and then form it to shape. I'll send you a section off a roll of tape I have to see if it will fit your needs. PM me

#998779 - 03/30/14 08:06 PM Re: Need to insulate a small harness from headers [Re: SSLance]  
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Richie Cat Offline
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Lance
I have stuff like this at work. It comes on sensor wiring. Would you like to send you some?


83 SC, 355 w/TPI
#998805 - 03/31/14 12:47 AM Re: Need to insulate a small harness from headers [Re: SSLance]  
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gmachinz Offline
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The corrugated conduit I use on my harnesses resist ambient temps up to 275F. You could use this on your wiring, then over that use some fiberglass plug wire sleeving from Taylor for example over the conduit-you don't want to seal anything against the wires themselves-you want them to still breathe and not hold the heat in.


gbodyparts1234@yahoo.com

HARNESSWORX
#998826 - 03/31/14 02:09 AM Re: Need to insulate a small harness from headers [Re: SSLance]  
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SSLance Offline
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SSLance  Offline
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Peoria, AZ
Thanks for the offers everyone, O'Reilly has a 3' length of the DEI 3/4" heat shield and some Cool Tape in stock so I was able to get it all back together today.

Here is what happened to the last harness that was in the place



Thankfully the wires inside it were untouched.

This is the one I was most concerned about, the oil pressure sender circuit.



The rest of the harness that goes forward under the header, now protected by the DEI loom and cool tape.



I was able to form the shielding to aim it away from the header and I'm certain it'll work great now.

I knew it was close before and I watched it all season long, only near the end of the year did it finally melt a hole through the casing. I feel a lot better about how it is now.


Lance
1985 Monte Carlo SS Street Car
#998832 - 03/31/14 02:35 AM Re: Need to insulate a small harness from headers [Re: SSLance]  
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mmc427ss Online content
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mmc427ss  Online Content
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Just curious, was the black loom GM or aftermarket crap? There is a huge temp difference between them. You can use the a/f loom in cool places, but not around the exhaust.
Bob

#998846 - 03/31/14 04:28 AM Re: Need to insulate a small harness from headers [Re: SSLance]  
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gmachinz Offline
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The high heat resistant loom can be identified by the blue stripe which runs the length of its spine. It's a flat black color vs. the shiny parts store crap. It has to be j1128 compliant which means safe for underhood use and that is what I stock and use for all my harnesses. The Delphi SXL crosslink wire I prefer is rated at the same spec, too. High heat builds resistance so high quality wire is a must underhood-this is no place for cheap conduit and parts store wiring.


gbodyparts1234@yahoo.com

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#998855 - 03/31/14 11:30 AM Re: Need to insulate a small harness from headers [Re: mmc427ss]  
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SSLance Offline
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SSLance  Offline
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Peoria, AZ
Originally Posted By: mmc427ss
Just curious, was the black loom GM or aftermarket crap? There is a huge temp difference between them. You can use the a/f loom in cool places, but not around the exhaust.
Bob


Harbor Freight special...


Lance
1985 Monte Carlo SS Street Car
#998856 - 03/31/14 11:36 AM Re: Need to insulate a small harness from headers [Re: SSLance]  
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SSLance Offline
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SSLance  Offline
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Peoria, AZ
And there was just barely enough room to get my finger between that harness and the side of the header tube, right where the 4 header tubes all start to come together. The wires inside that one were the factory knock sensor, factory temp sensor, and the aftermarket two wire inside a casing harness to the new Dakota Digital temp sensor. I'm really surprised it lasted as long as it did, considering what I put the engine through last year.


Lance
1985 Monte Carlo SS Street Car
#998936 - 04/01/14 01:29 AM Re: Need to insulate a small harness from headers [Re: SSLance]  
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spacemanspif Offline
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Just out of curiosity, is there any reason why you didn't consider using header wrap? Cost is probably more for the header wrap than 12" of shield but still curious...


-Mike

F-body bucket seats, camaro console, carb'd 5.3/4L80E swap

Fastest time to date: 13.390 @ 102.42
Best r/t: 0.007 I got lucky smile

Killed a few cones too

#998942 - 04/01/14 02:21 AM Re: Need to insulate a small harness from headers [Re: SSLance]  
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SSLance Offline
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SSLance  Offline
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Headers are still way too pretty to be covering up, plus I've heard bad things about header wrap rusting out headers.


Lance
1985 Monte Carlo SS Street Car

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