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I purchased a clean 940 with about a hundred thousand miles on it last year. I, like this gentleman had no idea what a flame trap was until this week. After a year and no oil leaks or anything my Volvo started pouring oil out of the rear main seal. I went to the volvo dealer for an estimate on the cost of replacing the seal. The parts guy told me it would run about $550.00 then ask me if I was cleaning or changing the flame trap at each oil change. Not knowing what it was I can assure you I wasn't. He sold me a flame trap and housing for a total of seven dollars and suggested I change it and try driving the car a couple or three weeks and see if the seal reseated. I changed it yesterday and it hasn't dripped a drop in two days. I probably came real close to blowing all the seals in the oil system. If you are a new Volvo owner and don't know what a flame trap is, you better find someone to do a show and tell real soon. The parts people at Pep Boys, Auto Zone, O'Reiley etc, wont know either. You are going to be on your own if you don't get a Volvo manual or ask a Volvo owner or mechanic.
The flame trap housing is a plastic fitting that is about 3/4 inch on the top end 1/2 inch on the bottom and it has a 1/4 inch pipe to connect a vacuum line that comes out at about 60% in the middle. The flame trap or insert fits inside this housing assembly. It looks kind of like a shower head with all the little holes through it. On my car its on the left side of the engine just back of the throttle body. From the right side of the engine you can see the thing and recognize it by the little vacuum line the comes off the flame trap and goes into the manifole. I understand on some other models its more difficult to reach, but I changed mine in about twenty minutes. Kind of cheap and easy to cause so much trouble if you don't service it.
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