2004 S80 NA - Vacuum line for Seafoam

dejongmc · Post by **dejongmc** » 23 Jan 2019, 13:16

Hello,

Which vacuum line can I use to suck-up seafoam to attempt to clean the PCV system?
I have the 2.9 non-turbo V6 engine.

Post by **RickHaleParker** » 23 Jan 2019, 23:47

None, the vacuum draws air from the PCV, it does not push air to the PCV.

The 2.9 is not a V6 it is a I6, (Inline 6 cylinder).

dejongmc · Post by **dejongmc** » 24 Jan 2019, 10:47

Appreciate the corrections.

Is there a way to get the Seafoam through the PCV system on these 2.9L I6 engines?

Post by **matthew1** » 24 Jan 2019, 11:48

I posted this on the MVS Facebook page. I don't have anything right here that would help.

Post by **June** » 24 Jan 2019, 12:31

As long as the pcv system is working there is a scheduled maintenance on the banjo bolt at like 120K and like every 60K thereafter. It is in your maintenance booklet. Currently my car is in for service and I have their service loaner or I would photograph the correct page for you.

What the service is; 1 clean or replace the banjo bolt.
2 replace the tubes that go to the
banjo bolt.

Here is a photo of the part Volvo replaces in this service. Photo courtesy of my service advisor when they replaced mine on my 2004 S80 2.9 T6. This is the the tubing that connects to the main vacuum source for the PCV system from what I understand. That black tubing on that part had cracked on my original so I am glad I had the service preformed. June

Post by **oragex** » 24 Jan 2019, 12:51

The PCV box may just fail inside due to age, not necessarily from being clogged. Had this on my 2.4 non turbo S60. The box was completely empty, still the glove would inflate. New box and now the glove gets sucked in quite strongly.

dejongmc · Post by **dejongmc** » 24 Jan 2019, 18:13

Thanks for the info June.

Where is the banjo bolt located on these 2.9L I6 engines?

Post by **June** » 24 Jan 2019, 18:27

dejongmc wrote: ↑24 Jan 2019, 18:13 Thanks for the info June.

Where is the banjo bolt located on these 2.9L I6 engines?

I pulled a image off the internet of a 2004 2.9 intake and marked what I believe to be the banjo bolt. I know it is reachable without removing the intake manifold. So it looks almost center underneath. June

dejongmc · Post by **dejongmc** » 24 Jan 2019, 21:35

Thanks again.

So what does this bonjo bolt do?
I will look this weekend if I can find it, but it is a bolt with a hole in it, so I'm trying to understand the purpose of it.

Post by **SuperHerman** » 25 Jan 2019, 12:24

"What does the banjo bolt do?"

Look at June's picture of the aluminum tube and plastic pipe. The aluminum tube which is "V" shaped has coolant flowing through it if I recall correctly. It is totally sealed from the rest of the assembly. This has a warming and cooling function the engineers thought would be helpful. The plastic pipe off the middle carries exhaust gases (don't recall if positive or negative pressure) which the engine management system needs. I don't have my car right now so I cannot give better details - but what I describe should be enough.

The "banjo bolt" - being partially hollow, and having a hole in it, allows the gases to enter the plastic tube. When properly tightened an airtight joint is created and at the same time allows the air in the intake to pass through the plastic hose. The aluminum round circle also includes a nipple. It is one aluminum piece and is welded to the V. It has a hole in the nipple for air flow.

The main concern is the nipple gets clogged and needs to be cleared. A piece of wire shoved in there and a spraying of cleaner usually is sufficient to get it operational. In older vehicles the plastic pipe gets brittle and cracks, while the aluminum "V" remains usable. Some people replace the plastic hose with a suitable substitute. Usually the service is to just clean out the small hole in the "V" that allows the air to flow through the plastic hose. Others buy the part and just use the plastic pipe so they don't have to disturb any of the other hoses.

Looking from the front of the car at the engine, near the oil dipstick, under the front passenger side of the manifold you will find the banjo bolt and the rest of the fittings. Look at the picture so you know what you are looking for and feel around. Usually one can service the banjo bolt by loosening the oil dipstick and then attacking the banjo bolt. It can be an extreme pain to re-thread the bolt - beware of cross threading. Tighten by finger until you are near the end so you know it is going in true.

Not sure if that helps.