740 1987 oils blown out my fill cap or blown out dipsti

jason38 · Post by **jason38** » 23 Nov 2009, 09:31

need to know why oils blown out my fill cap or my dipstick? it builds up pressure and seems 2be blown oil every where in engine compartment? help

Post by **writer100** » 23 Nov 2009, 11:22

This sounds like a classic case of a clogged Positive Crankcase Ventilation system. Check your flame trap and the surrounding hoses. Clean/replace as necessary.

Post by **billofdurham** » 23 Nov 2009, 12:23

Welcome to Matthew's Volvo Site.

+1 on the diagnosis.

The attachment shows the PCV system for the 740 B230F engine. The flame trap is part #5. If you are going to clean the whole system, which is recommended if it hasn't been done for some time, do not pull hose #10 out of place as it is a major job getting it back in.

The B230FT does not have a flame trap.

740 PCV Diagram.pdf: (478.77 KiB) Downloaded 222 times

Bill.