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Pcv, breather box help

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
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TyRawr
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Re: Pcv, breather box help

Post by TyRawr » Fri May 15, 2020 11:50 am

Now as far as the ports on the engine block for the breather box how far should I be able to stick a pipe cleaner in and clean it out. I wiped it down but only got half a qtip in there and it didn't want to go any further back. Same situation for both, the hole upper right and lower left. Btw what do each of these holes do/go to. The lower left is connected straight to the box but the upper right had a little almost 90° hose attached to it.
Last edited by TyRawr on Fri May 15, 2020 12:04 pm, edited 2 times in total.

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Re: Pcv, breather box help

Post by TyRawr » Fri May 15, 2020 12:02 pm

Also want to clarify that there has been no sign of sludge or goop (what i found in the box) under the oil cap or in the dipstick or when changing the oil. Although when i changed the oil there was a lack of oil drained. Saying that only about half of what was put in came out the last time. The oil level seemed okay but lack of oil drained. The oil level seems okay again right now but dark. Now after replacing everything that I am right now ( breather box, plugs, coils. Should I change oil and start the engine or replace oil and start her up? I also need some guidance on replacing the entire line/ hose that attaches to the breather box that banjo bolts into the intake manifold, just because of the coolant line over to the left
Last edited by TyRawr on Fri May 15, 2020 1:38 pm, edited 1 time in total.

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Re: Pcv, breather box help

Post by TyRawr » Fri May 15, 2020 12:05 pm

This is where I'm at right now
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- Pete -
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Re: Pcv, breather box help

Post by - Pete - » Fri May 15, 2020 3:46 pm

You should always get ~6 quarts between the pan and filter when you drain the oil. If there are leaks or you’re burning some, obviously that’ll be slightly less.

I think you’re talking about the small coolant pipe/nipple that allows oil buildup to drain out of the intake manifold. Below is the XC90 part which will work as a replacement. This is the only way to replace JUST that piece. The other option is to buy the very expensive pipe that runs back to the rear of the engine & also contains the nipple/banjo junction piece.

https://www.fcpeuro.com/products/volvo- ... o-30731007

You may want to also ensure you have a banjo bolt that has a functioning check valve. Don’t forget copper crush washers also. Here’s the banjo with the built in check valve.

https://www.fcpeuro.com/products/volvo- ... vo-8653884

If you’re already using solvents I’d change that oil very soon after adding. The original metal pickup tube on these has a lip on the underside that protrudes inward & traps a lot of particles so each time you start the engine those particles are actually still inside the bottom of the pickup tube. When the screen becomes plugged the pump essentially starved for oil, as does the rest of the engine. I have a picture that will help to make sense. The updated pickup tube has a bellmouth shape which allows all the particles to fall out the bottom when the engine is idling or shut off. HERE’s the thread I posted the pictures in.

For the ports, without taking the pan off you’re just going to have to try to get your pipe cleaner around the 90* bend in the passage. Feel free to spray solvents/compressed air in there as well. Obviously whatever is in there will fall into the pan and should be flushed out with cheap oil before running the engine.
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Re: Pcv, breather box help

Post by TyRawr » Fri May 15, 2020 4:25 pm

I have purchased that entire pipe that runs across the whole engine and a new banjo bolt to replace. If you look in that picture a piece of that pipe broke over on the left towards that short coolant hose to the thermostat I believe it is. Found it for a good price so just going to replace the whole thing. As far as flushing oil should I drain -plug- fill- drain or can I drain and just pour oil to flush with the plug open letting the oil flow through. I have never done a flush. And if I remove the coolant hose from that line coolant comes out both sides. Do I need to drain coolant to complete that whole pipe swap?

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Re: Pcv, breather box help

Post by - Pete - » Fri May 15, 2020 5:52 pm

Until you have your passages cleared out I’d just leave the drain plug out. You can even pour cheap clean oil through that lower passage if you want. When I say “flush” with clean oil I’m saying to use clean oil dumped into the crankcase to “float” out any junk laying on the bottom that has come out of the passages you’re cleaning.

Ultimately, once it’s back together, I would plan on putting in cheap oil (Formula Shell, Citgo, whatever is cheap), run it up to to temp, maybe a short drive & then dump it & change filter. Next fill use cheap oil again, run it a short 100-200 miles, then dump it but don’t change filter. Repeat this again & change filter. Then put in your good synthetic oil & filter. It may seem overkill but the stuff that’s likely built up in your oil pan is going to come loose if you are driving the car longer durations. Your Seafoam is also going to expedite the rate at which it begins to come free and float around. This is just a good way to mitigate how much of that junk you can prevent from clogging the pickup tube.

Until your drain oil looks less dark & scarey I would adhere to short oil change intervals.

For that coolant pipe, I’d get some of the HF hose pinch clamps like these. You should be able to only lose a tiny bit of coolant, if any at all, if you can get your rubber lines clamped.

https://www.harborfreight.com/4-piece-f ... 65116.html
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Re: Pcv, breather box help

Post by darrylrobert » Fri May 15, 2020 10:40 pm

did you say you put sea foam in you oil?

With your intake off, have a look inside at the valve is it clean?

Ive watched a few videos and i an undecided on using this on my car. I am not keen on to add it to the oil but to pour it into the spark plug hole to clean out the combustion chamber. The results i have seen from trying this are fairly poor, it does nothing.

I have purchased a can of Liqui Moly fuel cleaner, as i think my injectors may need cleaning, the reviews on this product is very good.

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Re: Pcv, breather box help

Post by TyRawr » Sun May 24, 2020 2:51 pm

So last thing before I put it back together. I want to replace this hose with the new one and I don't see anything showing how to do this one. Left side is no problem but whats with the extra banjo bolt hole on the other end.
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Re: Pcv, breather box help

Post by oragex » Sun May 24, 2020 3:08 pm

It's a good moment to replace the thermostat and to verify the small plug-in connector at the starter (may get loose or corrode). May also want to test the purge solenoid with a battery, just atop of the starter

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Re: Pcv, breather box help

Post by - Pete - » Sun May 24, 2020 3:36 pm

Coolant flows through that pipe & they used a banjo on that end because of the close quarters. You don’t want to forget copper crush washers for either banjo. If you forget the coolant banjo crush washers you’ll have a coolant leak. If you forget the crush washers on the intake manifold bolt you’ll have a small oil leak.
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