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Wiring Loom Corrugated Tubing: does it do anything?

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cn90
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Post by cn90 »

Just general question, not unique to Volvos...

- With time/heat (usually > 10yr/100K), the Wiring Loom Corrugated Tubing is falling apart.

- I always replace it with new tubing. But I notice the wires themselves have very good plastic sheath and rarely breaks down...

- Let's say it is summer heat and the underhood temp after a hot run is 80C: with or w/o the tubing, the temp of the wire plastic sheath is 80C anyway..
The question is: for wiring loom that does NOT contact anything (no frictional contact)...does the tubing protect the wires at all?

Attached is a random photo from the web...

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Wiring-Loom.jpg
Wiring-Loom.jpg (89.75 KiB) Viewed 3199 times
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RickHaleParker
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Post by RickHaleParker »

Protects from abrasion, corrosion and hungry varmints.
Looks better then the underlying mess of wires.
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firstv70volvo
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Post by firstv70volvo »

cn90 wrote: 18 Aug 2021, 16:29 Just general question, not unique to Volvos...

- With time/heat (usually > 10yr/100K), the Wiring Loom Corrugated Tubing is falling apart.

- I always replace it with new tubing. But I notice the wires themselves have very good plastic sheath and rarely breaks down...

- Let's say it is summer heat and the underhood temp after a hot run is 80C: with or w/o the tubing, the temp of the wire plastic sheath is 80C anyway..
The question is: for wiring loom that does NOT contact anything (no frictional contact)...does the tubing protect the wires at all?

Attached is a random photo from the web...

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Wiring-Loom.jpg
The split loom tubing is especially protective for the coil wiring and this is based on experience. The split loom tubing keeps individual wires grouped together and protected from getting pinched between the cover and the head. The split loom tubing in the head is also most likely to deteriorate first because of the higher heat. The wire insulation is tough but I did manage to damage insulation on a wire because it was pinched when I tightened down the cover over the coil wires.
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cn90
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Post by cn90 »

The cosmetic cover: I removed it and stored on garage shelf for the last 10 years...
This way heat is not trapped and I have quick access to ignition coils #2 --> #5.
Also, I can wipe off any spilled oil.
Basically that cosmetic cover is useless.
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darylrobert
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Post by darylrobert »

I recently vacuumed picked that broken corrugated plastic from the spark plug wells before removing the plugs, a real pain. I will not be putting the "VOLVO" cover as i think it traps heat and cooks the coils. For wires near the engine wrap new corrugated in scotch tape.
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93SCMax
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Post by 93SCMax »

Does anyone have a decent source for a high quality version of this corrugated tubing? Many of the reviews I read about Amazon shipped products indicated some weren't very heat resistant and deteriorated too fast. Maybe something that can be locally sourced at a chain auto parts store?
Thanks.
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Blacklab467
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Post by Blacklab467 »

AC Delco makes a high quality split loom and you'll pay a lot more for it but its worth it. The stuff that you'll find in the hardware store or lower end auto parts stores will not stand up to the heat as well and break down quickly. That said, I don't know where to buy it anymore, probably at an AC Delco parts store if they even still exist, perhaps you could order it at the GM dealer.
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Post by abscate »

For those who remove the cover , how do you remember how many valves you have when your date asks you hard questions like that ?
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Post by xHeart »

cn90 wrote: 18 Aug 2021, 16:29 The question is: for wiring loom that does NOT contact anything (no frictional contact)...does the tubing protect the wires at all?
In the spirit of good housekeeping, I did re-loomed ALL electrical wires in our 2001 V70XC. It feels better each time I open the hood.

The dirt particles, heat, and moisture will eventually eat into the conductors' protective sheathing after loom is out of the way, causing electrical faults. Loom keeps the dirt and moisture away.
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Post by hu5ker555 »

darylrobert wrote: 19 Aug 2021, 02:47 I recently vacuumed picked that broken corrugated plastic from the spark plug wells before removing the plugs, a real pain. I will not be putting the "VOLVO" cover as i think it traps heat and cooks the coils. For wires near the engine wrap new corrugated in scotch tape.
Yes...always vacuum or blow out the top of the engine before beginning any work on the coil packs or spark plugs. Those little broken plastic pieces from a deteriorated loom can't be good inside the crankcase.
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