what is the flame trap everyone talk aboutreplacing?

I learned about flame traps last year trying to track down some oil loss. The good news is that the weakest point in the system was the gasket on the oil filler cap, and that's where the excess pressure and oil was escaping.

Which brings me to my recommendation - if you have a leak at the oil filler cap, do not just replace the gasket without cleaning/replacing the flame trap at the same time. Otherwise, the excess pressure will go find the next weakest point in the system, like the rear main seal.

something your will come to respect, love, hate and think is the biggest PITA...

and the fact you KNOW what it is will mark you out to other volvo owners...its kinda like fight club ...walk into a room and drop 'flame trap' into a conversation..the guy who over hears and turns and gives you that menaingfull look....owns a volvo!

If your flame trap is clogged the excessive oil pressure could cause engine seals to leak. Make sure it is cleaned out. There is a black breather box (plastic) mounted down low on the side of the block as part of the whole assembly. I replaced mine, it's only $30 at dealer.
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Keith in Maine - 1990 740GL Wagon 245k AW70L B230F Red Block 8 Valve Non-Turbo Rex/Regina Non-EGR R-12 A/C

It's all right here:
http://www.brickboard.com/FAQ/700-900/EngineSealsBeltsVent.htm#Crankcase_Ventilation_%20A_Treatise
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-------Robert, '93 940t, '90 240 wagon, '84 240 diesel (she's sick) , '80 245 diesel, '82 Mercedes 300SD