The following are the minimum academic requirements for entry into the Ph.D. in Mechanical Engineering program at McMaster University:

Applicants are required* to hold a Master's degree (overall average equivalent to a McMaster B+) in a related field
General information pertaining to admission requirements are outlined in Section 2.1.2 Admission Requirements for Ph.D. Degree in the Graduate Calendar.
TOEFL Scores
Minimum 550 - written test
Minimum 213 - computer-based test
Minimum score of 88
To ensure your TOEFL score is received by this department, please indicate Institution Code 0936 and Department Code 68 when requesting your transcripts from the TOEFL testing centre.
IELTS Scores
Test must be Academic, not General

Minimum overall score of 6.5
Minimum score of 5.5 for each section
MELAB Scores
Minimum score of 85