Oil leaks at the seals, an oily smell in the cabin or an engine that "breathes" heavily can point to a clogged crankcase ventilation. When hoses harden and the flame shield clogs up, pressure builds in the crankcase, and this is a common checkpoint on older Volvo 240 with B17/19/21/23.
PV 444, PV 544, 1800, 140, 164, 260, 240, 780, 760, 740, 960, 940, V90, S90
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This category gathers the parts that control the circulation of crankcase gases back to the intake. The group includes hoses, flame shields and flame shield nipples, O-rings, rubber caps, clamps, hose clamps and screws. When going through the system it is worth replacing cracked hoses and cleaning or replacing the flame shield at the same time, since a single sluggish part is enough to disrupt the whole flow. Always check hose dimensions and connections against your engine variant before ordering.