Water oil pollution

Greetings from Guatemala. I'm repairing a 1994 Subaru Justy with a 1000cc 3-cylinder engine. The coolant is contaminated with oil. I removed the cylinder head thinking it was the gasket, but I didn't find any obvious problems with it. There's a front engine cover where the water and oil pumps are located. I'm wondering if it's possible for the coolant to be contaminated with oil through that area.

Hello, look if you have an oil or refrigerador intervener this goes in the oil filter if it carries it, bridge the 2 sleeves and test