Engine PCV Box Oil Separator Diaphragm with Spring Compatible with S40 V50 C70 Code p0174 p0171 Replace 30684381 30788494 31338684 31338685

Seems to work perfectly in my 2012 Volvo S60. Seems more robust than the original being replaced. I don't know how long it will last, but it seems at least as good as the original. I was able to reuse the original cap so I can't speak to how that fits. I was hesitant to make the repair given how old the plastic is on the PCV housing, but it seems to have worked fine. After reviewing various procedures online, I followed one set of instructions that allowed me to make the fix in about 10 minutes. First drive the car about 15 minutes to warm the engine. Make a mark of some kind across the seam between the cap and housing so you can line up the cap exactly the same when replacing. Wear thin gloves that can protect from hot surfaces. Use a chisel to get into the seam between the cap and housing. I popped the cap of in about 10 seconds, then maybe another 10 to pull it completely off with my hand. Put the diaphragm into the cap like the old one being replaced and attach the spring. Place the cap/diaphragm/spring assembly in place, lining up the mark you made exactly. Use something like a flathead screwdriver or a small piece of wood to push down on the cap all around the edges. The cap needs to be lined up exactly since there are slots that correspond. I used a piece of 1x2 that was about 8 inches long to get leverage on the cap.

Item fit my 2015 Volvo 2.5 liter turbo 5 cylinder engine. I could not however get the new cap to snap on to my old oil separator assembly. But I did get the new diaphragm to work with my old cap, although getting it back on was pretty hard. As you can see it in the picture I had to use a long board pry up against the intake manifold and push it down. Hope this helps others.

This worked perfectly on my 2013 Volvo S60 T5. Shop wanted $1100 to replace the entire oil filter assembly, but this part and about 30-40 minutes of easy work fixed the issue.

I'm happy that this kit came with the cover cap as well. Although the stock cap came off without breakage. I found this to be the cause of the warning light on the dash, along with the whistling sound. You can check if this is the problem while releasing crankcase pressure by pulling the oil stick or oil filler cap, and the whistle goes away. Sure enough, the diaphragm was torn. This is a common problem on the Volvo 5 cylinder when approaching 130K. Look for the roughly 2.5" diameter black cap sitting right behind the oil filler cap. Plenty of YouTube videos showing how to change it out. Hope this helps.

I was only able to use the diaphragm. The cover is a tad bit bigger where it will not secure snuggly in place. I was careful enough with the original cover to be able to reuse it. It's been about 5 months using this and is still holding up after about 5k miles. Hopefully it continues to.

My son’s V50 was howling and stopped when I took off the oil filler cap. Pulling super strong suction through oil filler. Read that these diaphrams go bad and need replacing. Pulled air box to the side and popped off with stiff putty knife getting leverage on oil filter cap. Reused original cap but this replacement looked exact same. Lubed the lip of the PCV body with petroleum jelly and carefully positioned in place with the notch lined up and pressed down with 1/2 ratchet wrench levered off engine tab. It seated all the way round and totally fixed problem. Time will tell how long it lasts. I’m happy with purchase.

The part arrived on time, however, that is the only good thing. When the part arrived, I inspected the part which appeared to be identical at first glance. When I held the new PCV cover up to the original PCV cover, I noticed that the outer diameter of the New PCV cover was noticeably larger than the original. Inspecting the diaphragm in the new Cover, it appeared that it was slighter smaller, and less robust than the original diaphragm. I went for it anyway to install, since my original cover had a crack. Immediately as it tried to press the cover on, it was obvious that the new cover was not going to stay in place as it was slightly too large. Not sure what is going on with quality control, but this did not work on my T5 Volvo. YES IT DID look the same at first glance when I opened the package...this one is going back regrettably as it would have been a great deal if it fit!

This is sold as a set (Diaphragm, spring, and cover) and says it fits a 2012 Volvo S60 T5. While the diaphragm and spring fit, the cover does not. So if you need the cover this isn’t for you. The diaphragm will fit into the old cover. Thee issue is there is a small tab on the back of the cover which snaps into place on the oil body in the car. The tab on this cover is ever-so-slightly narrower than the existing cover, so it never secures. I tried a few times, and the old cover snaps right back on.