PCV Replacement - broken hose

s_watts · Post by **s_watts** » 08 Oct 2016, 18:26

So I was attempting to replace my pcv system today, but when putting things back together this tube broke (the smaller of the two connected to the part with 2 copper crush washers). What function does this serve and whats the damage if I put it back together and run it. The tube seemed kind of clogged. Any thoughts? I am needing to get my vehicle running again for monday, but really do not want to have to remove the intake manifold again.

Also had an issue where the leftmost lower intake bot (the really tricky one), was to long to remove, it would hit aluminum casting. I eventually cut a notch in the gasket to put the replacement over the bolt.

Thanks!

crankycar · Post by **crankycar** » 08 Oct 2016, 21:12

That I do believe is where the PVC system gets its vacuum, so yes it is important, but saying that, it will run until fixed, the question is will the system pressurize and blow seals, as a getby I would loosen a hose, the one I would do to be safe is the one on top of valve tower and attach a piece of garden hose or the like to get the blowby down lower, sort of how the old cars had the vents. but get the fitting and replace it..

bugeye · Post by **bugeye** » 09 Oct 2016, 05:13

That hose provides the vacuum for the crankcase. It is critical this hose be clear. Replacement of the hose is expensive (part ~ $200) and typically required as the tube becomes clogged and brittle from the engine heat. Do not delay replacing as excessive crankcase pressure may blow out seals resulting is major quick oil loss. The suggestion for vent hose from the top of the engine to lower is ok for a day or two until replacement with correct hose and components. Suggest looking at IPD or FCP Euro for parts. I have used only Volvo branded PVC parts as I wanted original reliability. Aftermarket parts may not be as durable. Purchase the complete kit.

s_watts · Post by **s_watts** » 09 Oct 2016, 08:35

This looks like what I need. Thanks for the input. Guess I will try this Wednesday. Any thoughts on attaching the other side of the hose assembly, will that be difficult to access?

https://www.fcpeuro.com/products/volvo- ... e-30731068

fixer333 · Post by **fixer333** » 09 Oct 2016, 20:07

I believe the banjo fitting at the manifold is where the PCV system gets it vacuum while idling and at low power. At higher power and with the turbo on, it gets vacuum from where the PCV hose hooks to the PTC nipple( yeh I said nipple) on the turbo inlet hose.

Even with the banjo fitting kinked / blocked crankcase pressure should still be released into the turbo inlet hose, so you shouldn't get damaging pressure in the crankcase.

If you blow through the banjo fitting that attaches to the manifold , air will come out of the hose that attaches to the top of the oil can , and and at the other end where the hose attaches the the PTC nipple at the turbo inlet( they are all in the same circuit ).

If you broke( not kinked or blocked it) the fitting and it lets in air right at the manifold, its possible that it could cause a vacuum leak bad enough to cause running issues, even though its pulling in crankcase air normally, it could change the metering( amount of air).

As far as difficulty replacing it , the hardest part is probably hooking up the banjo fitting( the part you broke).

With the manifold in place ( if you try to replace it without removing it) you will have to get to the banjo bolt and the fitting on top of the oil can where the rubber hose attaches. At the other end it attaches to the PTC nipple on the turbo inlet hose( you will have to cut the clamp off if original and have a replacement hose clamp.Also at this end is another banjo fitting that attaches to the head and carries coolant( it connects to the other side at the thermostat). You will have to drain some coolant or catch it when you remove the bolt.

s_watts · Post by **s_watts** » 10 Oct 2016, 19:00

Great info. I managed to get some vacuum hose at the autostore and replace that line. It was kind of a blessing in disguise, because coming into the banjo bolt it was so clogged I had to drill that grit out.

fixer333 · Post by **fixer333** » 10 Oct 2016, 19:48

s_watts wrote:Great info. I managed to get some vacuum hose at the autostore and replace that line. It was kind of a blessing in disguise, because coming into the banjo bolt it was so clogged I had to drill that grit out.

Mine was like that too, worse spot in my whole PCV system.

PeteB · Post by **PeteB** » 11 Oct 2016, 12:44

Is this part used on the non-turbo 850 or is it another model only?
I want to check it on our car if it has it obviously.

fixer333 · Post by **fixer333** » 11 Oct 2016, 21:01

PeteB wrote:Is this part used on the non-turbo 850 or is it another model only?
I want to check it on our car if it has it obviously.

I dont think so , maybe someone else knows. I saw a video on changing the PCV system on a 90's 850 turbo and it did not have the banjo fitting on the manifold.

fixer333 · Post by **fixer333** » 11 Oct 2016, 21:05

s_watts wrote:Great info. I managed to get some vacuum hose at the autostore and replace that line. It was kind of a blessing in disguise, because coming into the banjo bolt it was so clogged I had to drill that grit out.

If you actually drilled out the bolt, not the fitting , you might need to get another one. The bolt has a rattle valve , that I believe shuts off flow from the PVC system while the turbo is on( when the manifold has boost pressure it shuts the valve).