oiling · FF-0048

When did Ford add crankcase ventilation to the Flathead, and why shouldn't I mix the breather parts?

Steve says Ford engineered a crankcase vent system from 1935 through 1953. On first- and second-generation engines it vents through an opening in the oil pan; on 1949–1953 engines it vents through the intake manifold. He warns that swapping the breather on an engine with no rear main seal can pressurize the crankcase and push oil out.

Expert

Steve Coppock

Evidence

expert attributed

Component

crankcase ventilation and breather

Applicable scope

1935–1953 Ford Flathead V8