940 L4-2320cc 2.3L DOHC VIN 89 B234F FI (1991)
Flame Trap: Description and Operation
Oil Trap And Flame Guard System
Prevents a possible backfire from entering the crankcase. Should the backfire enter the crankcase, it could ignite the blow-by gases. Periodic cleaning or
replacement (see "MAINTENANCE PROCEDURES") of the flame guard helps prevent crankcase over-pressure. Fig. 8.