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The flame trap service on a 1988 240 is sooooo much easier than on the earlier B230F and B23F engines.
The housing for the trap is ABOVE the intake manifold, and a normal-size human hand can get at it. A 45-min job on my 1986 244 is a 10-min job on my 1988 244.
Above the oil separator box are 6 parts. The "S" hose, housing for trap, trap, large hose, small hose, brass fitting.
Over time the hoses get oil-hardened and brittle and clogged. The large hose is a special one, I'd get a new one from a dealer. Same for the "S" hose. The small hose is a NAPA or other parts house item. The trap is from an aftermarket supplier. If you are using synthetic oil, omit the trap.
The brass fitting should be removed and cleaned out. Seldom needs replacement.
Was it a service writer and the dealer that you spoke to? They work on commission, and are hardly ever DIY friendly. Make friends with the parts clerks, they like to help - usually.
Good Luck,
Bob
:>)
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