Same happen to me only with a IHC 806 diesel, looked like exhaust coming out filler cap, and so much pressure in crankcase it was even leaking oil out front seal, problem was the the breather filter in the head over the breather pipe that looks like wire mess screen was plugged with 40 years of dirt crud , causing the breather not working properly, i took the mess screen out and washed it, my problem was solved :~)
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