The past tense of throw a monkey wrench in the works is threw a monkey wrench in the works.
The third-person singular simple present indicative form of throw a monkey wrench in the works is throws a monkey wrench in the works.
The present participle of throw a monkey wrench in the works is throwing a monkey wrench in the works.
The past participle of throw a monkey wrench in the works is thrown a monkey wrench in the works.