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P80 Positive Temp Coefficient Nipple "PTC VALVE" To drill, or not to drill

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P80 Positive Temp Coefficient Nipple "PTC VALVE" To drill, or not to drill

Post by abscate » Tue Apr 16, 2019 6:58 am

I sit wiser in the end to suffer the slings and arrows of outrageous Crankcase pressure on the PTC Nipple?

This thread is for discussion on drilling, cleaning, and both on high mileage Volvo P80 engines

Volvo says clean every 60k

Excellent teardown thread here by Lee


https://www.matthewsvolvosite.com/forum ... =1&t=68898
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Re: P80 Positive Temp Coefficient Nipple "PTC VALVE" To drill, or not to drill

Post by abscate » Tue Apr 16, 2019 6:58 am

One jerks opinion

The PTC Nipple

The PTC (Positive Temperature Coefficient) Nipple is just a hole, or Orfice nipple , to use the Volvo term. Its often mistakenly called a valve as it has an electrical connection, but that is just a heating element to keep the sludge from condensing and blocking it. It is a valve in the sense that it regulates vacuum to the Positive Crankcase Ventilation system, but it does not open and close like most think of a valve.

It is often drilled out, when in fact it is a required cleaning maintenance item every 60k miles on a new car, and (my recommendation) 30k on an old Volvo.

The reaction to "Hey the PTC is clogged, lets drill it out" should be "Why didn't I clean this per schedule?"

No judging here.

:D
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Re: P80 Positive Temp Coefficient Nipple "PTC VALVE" To drill, or not to drill

Post by Rattnalle » Tue Apr 16, 2019 7:06 am

Volvo put it there for a reason. Don't mess with it other than making sure it works by cleaning it.

My two cents.

PS that goes for things like cats and other stuff as well.

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Re: P80 Positive Temp Coefficient Nipple "PTC VALVE" To drill, or not to drill

Post by abscate » Tue Apr 16, 2019 7:13 am

I could not find the PTC Nipple as a separate part - it does come with the Air Hose (Snorkel)

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Re: P80 Positive Temp Coefficient Nipple "PTC VALVE" To drill, or not to drill

Post by Danonly55 » Tue Apr 16, 2019 7:20 am

Can this part be accessed without removing the intake manifold?
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Re: P80 Positive Temp Coefficient Nipple "PTC VALVE" To drill, or not to drill

Post by ZionXIX » Tue Apr 16, 2019 7:59 am

Mine didn't even need to be drilled. It just popped out with a little prying.

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Re: P80 Positive Temp Coefficient Nipple "PTC VALVE" To drill, or not to drill

Post by bmdubya1198 » Tue Apr 16, 2019 8:20 am

Danonly55 wrote:
Tue Apr 16, 2019 7:20 am
Can this part be accessed without removing the intake manifold?
Yes, it sits at the bottom of the intake elbow, just before the turbo inlet.

The concept of drilling it out is to help vent crankcase gasses back into the intake a little easier. Usually the PTC itself is able to be removed with some prying, no drilling required for removal.
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Re: P80 Positive Temp Coefficient Nipple "PTC VALVE" To drill, or not to drill

Post by erikv11 » Tue Apr 16, 2019 9:00 am

I first posted these in ZionXIX's thread viewtopic.php?f=1&t=84698. It's been 18 months now, with no ill effects on my 95 R.

Image
Image

The PTC is not available separately as a replacement part, good news is you will almost never need a new one, there's nothing to break or wear out. Great junkyard part in that sense.

The grommet for the base of the PTC is available separately from Volvo as part number 3507985, about 4 bucks. Very worthwhile to replace that!
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Re: P80 Positive Temp Coefficient Nipple "PTC VALVE" To drill, or not to drill

Post by erikv11 » Tue Apr 16, 2019 9:08 am

Danonly55 wrote:
Tue Apr 16, 2019 7:20 am
Can this part be accessed without removing the intake manifold?
Yes, it is not located near the intake manifold it is down low near the brake booster at the firewall. And non-turbo cars like yours do not have a PTC. You may be thinking of the flame trap orifice specific to NA cars, which can be accessed by removing the air intake from the front grill and/or the air filter box for full access,.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
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'06 S60 R, 167k
'99 Camry V6 :shock: 125k
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Re: P80 Positive Temp Coefficient Nipple "PTC VALVE" To drill, or not to drill

Post by Chuck W » Tue Apr 16, 2019 9:10 am

erikv11 wrote:
Tue Apr 16, 2019 9:00 am


The grommet for the base of the PTC is available separately from Volvo as part number 3507985, about 4 bucks. Very worthwhile to replace that!
Thanks for that PN. When I did the PCV refresh on both cars, that grommet was pretty soft and I wondered if a replacement was available.

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